DOCSLIB.ORG

Baltic Astronomy

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Baltic Astronomy BALTIC ASTRONOMY An international journal Volume 2 1993 VILNIUS, LITHUANIA BALTIC ASTRONOMY An international journal published by the Institute of Theoretical Physics and Astronomy (Vilnius, Lithuania) for astronomical institutions of Lithuania, Latvia and Estonia. Editorial Board: A. Bervalds, Latvia R. Mitalas, Canada E. Saar, Estonia A. Sapar, Estonia I. Shmeld, Latvia V. Straizys, Lithuania (Acting Editor) J. Sudzius, Lithuania BALTIC ASTRONOMY is published quarterly (4 issues per year). The journal publishes papers, catalogues and reviews on all branches of astronomy. Papers from all countries are accepted. Editorial Office: Institute of Theoretical Physics and Astronomy, Gostauto 12, Vilnius 2600, Lithuania. Telephone 3702-613440, telex 261135 FI, fax 3702- -224694, e-mail: [email protected] . Annual subscription price is 45 U.S. dollars for institutions and 25 U.S. dollars for individuals (including postal expenses). Orders and money checks in dollars (drawn on a U.S. bank) should be sent to the Editorial Office on the name by V. Straizys. Manuscripts in English should be sent to the Acting Editor. Instructions to authors are given at the end of this journal. Submitted articles will be subject of refereeing. Baltic Astronomy, vol.2, 1-169, 1993. GENERAL PHOTOMETRIC CATALOGUE OF STARS OBSERVED IN THE VILNIUS SYSTEM V. Straizys and A. Kazlauskas Institute of Theoretical Physics and Astronomy, Gostauto 12, Vilnius 2600, Lithuania Received July 5, 1993. Abstract. A photometric catalogue of 7445 stars (8404 including the repeated measurements) observed in the Vilnius system UPXYZVS is compiled from 79 literature sources and unpublished data. The catalogue gives numbers of stars, their identification, right ascensions and declinations, magnitudes, U-P, P-X, X-Y, Y-Z, Z-V and V-S colour indices, spectral types and literature sources of the photomet- ric and spectral data. For about 60 % of stars, spectral types and luminosity classes determined from the photometric data are given. Key words: Vilnius photometric system - spectral classification - catalogues 1. Introduction Since 1969, 79 catalogues of stars observed in the Vilnius pho- tometric system (Straizys, 1992) have been published. They include the field stars, stars in open and globular clusters and associations, dark clouds, galactic areas. To make easier finding the photometric data of a star, general photometric catalogues on magnetic tapes of the stars observed in the Vilnius system have been compiled. Their descriptions have been published by North (1980, 1984), Zdanavicius et al. (1983) and Straizys et al. (1989). The last catalogue con- tained the data of about 5000 stars. Since then, the number of staxs 4 V. Straizys and A. Kazlauskas Table 1 (continued) Coding Description Ba Barium stars V, IV, III, II, lb, lab, la Luminosity classes of stars of the solar che- mical composition: main sequence stars (or dwarfs) subgiants, giants, bright giants and supergiants Be B-type stars with emission in hydrogen lines Ae/Be Herbig emission-line stars Bp, Ap (Hg-Mn,Si, B- and A-type stars with chemical peculiari- Cr-Sr-Eu) ties Am Metallic-line stars of spectral type A He wk, He st B-type stars with weakened and enhanced helium lines Of, Oe O-type stars with emission lines WR (WC or WN) O-type Wolf-Rayet stars LBOO A Bootis-type stars BS Blue stragglers DO, DB, DA, DZ, DQ White dwarf types SDO, SDB, SDOB 0-B subdwarfs SD Subdwarfs (metal-deficient F-G-K dwarfs) MD Metal-deficient stars MDE Stars with extreme metal-deficiency MDG Metal-deficient giants MDSG Metal-deficient subgiants MDGE Extreme metal-deficient giants MDSGE Extreme metal-deficient subgiants CN Stars with enhanced cianogen bands CH Stars with enhanced G-band CHL CH-like stars WG Stars with weak G-band SMR Super-metal-rich G and K giants BHB Blue horizontal branch stars RHB Reil horizontal branch stars GB Giant branch stars AGB Asymptotic giant branch stars AHB Above horizontal branch stars UV BR. Ultraviolet-bright stars in globular clusters SB Spectroscopic binary stars p Spectrum peculiarity General Photometric Catalogue... 5 Table 1 (continued) Coding Description e Emission lines in the spectrum n Broad spectral lines (rapid axial rotation) s Narrow spectral lines (slow projected axial rotation) sh Shell stars wl Weak metallic lines Table 2. Coding of the variability types Coding Description ACV a2 Canum Venaticorum-type stars ACYG a Cygni-type stars BCEP j3 Cephei-type stars BY rotating BY Draconis-type variables CEP, DCEP Cepheids CW W Virginis-type stars DSCT S Scuti-type stars EB eclipsing binary systems ELL rotating ellipsoidal variables FKCOM FK Comae-type stars GCAS 7 Cassiopeiae-type stars INA Orion variables of early spectral types INT Orion variables of T Tauri-type LB, LC Slow irregular giants and supergiants M Mira Ceti-type variables RCB R Coronae Borealis-type stars RS RS Canum Venaticorum-type stars RRAB, RRC RR Lyrae-type stars RV RV Tauri-type stars SR(A, B, C, D) Semiregular variable giants and supergiants of late spectral types UV UV Ceti-type flare stars ZZ ZZ Ceti-type white dwarfs * unique variable stars 6 V. Straizys and A. Kazlauskas 5. Literature sources The literature sources, from which photometric data have been taken, are numerated in the last column of the catalogue and listed in Appendix 2. A number of unpublished observations is given: in this case, the literature list gives only the observer's name. 6. Floppy disk version The catalogue is available on a floppy disk for IBM PC in ASCII text files. It can be obtained by covering the cost of the disk and postal expenses. Acknowledgments. The authors are indebted to A. Bartkevi- cius and E. Jodinskiene for their help in preparation of the catalogue at its initial stage. We are also grateful to S. Bartasiute, K. Cernis, R. Janulis, G. Kuriliene, E. Meistas, J. Sudzius, J. Sleivyte, V. Van- sevicius and K. Zdanavicius for submission of their unpublished ob- servations. References Jaschek, M. 1978, Catalogue of Selected Spectral Types in the MK System (Magnetic Tape S 3042). Strasbourg Stellar Data Center. Kholopov et al., 1985-1990. General Catalogue of Variable Stars, Vol. 1-4, Nauka Publishers, Moscow. Mermilliod, J. C. 1978, Bull. Inform. CDS, Strasbourg, No. 14, 32. North, P. 1980, A&AS, 41, 395. North, P. 1984, Bull. Inform. CDS, Strasbourg, No. 27, 133. Straizys, V. 1992, Multicolor Stellar Photometry, Pachart Publishing House, Tucson, Arizona. Zdanavicius, K., Jodinskiene, E., Kazlauskas, A., Straizys, V. and Bartkevicius, A. 1983. The Results of Photoelectric Photometry of Stars in the Vilnius Photometric System, Magnetic Tape, CDS, Stras- bourg and ADC, NASA. Straizys, V., Kazlauskas, A., Jodinskiene, E. and Bartkevicius, A. 1989, Bull. Inform. CDS, Strasbourg, No. 37, 179. General Photometrie Catalogue. 7 Appendix 1. Coding of the identification numbers. Durchmusterung catalogues -O.OAABBBBB CD north of -52° -O.OAABBBBB BD negative declinations north of -23° O.OAABBBBB BD northern hemisphere AA declination zone BBBBB star number HD and HDE catalogues 1.00BBBBBB BBBBBB = HD or HDE number Open and globular clusters 2.01293BBB open cluster NGC 129, BBB= number from Hoag, A.A. et al., 1961, Publ. Naval Obs., 17, 347. 2.0752BBBB open cluster NGC 752, BBBB= number from Heinemann, K. 1926, Astron. Nachr., 227,193. 2.07523BBB open cluster NGC 752, BBBB= number from Lavdovsky, V.V. 1961, Trudy Astr. Obs. Pulkovo, 73, 5. 2.1758BBBB open cluster NGC 1758, BBBB= number from Cuffey, J. 1937, Annals Harvard Obs., 105, 403. 2.2632BBBB open cluster Praesepe (NGC 2632, M44), BBBB= number from Klein-Wassink, W.J. 1927, Publ. Kapteyn Astron. Lab., No. 41. 2.6121BBBB globular cluster NGC 6121 (M4), BBBB= number from Greenstein, J.L. 1939, AJ, 90, 387. 2.62183BBB globular cluster NGC 6218 (M12), BBB= number from Kiistner, F. 1933, Veroff. Sternw. Bonn, No. 26. 2.63413BBB globular cluster NGC 6341 (M92), BBB= number from Zdanavicius, K. 1992, Baltic Astronomy, 1, 17. 8 V. Straizys and A. Kazlauskas 2.6494BBBB open cluster NGC 6494, BBBB= number from Hoag, A.A. et al., 1961, Publ. Naval Obs. 17, 347. 2.6611BBBB open cluster NGC 6611, BBBB= number from Walker, M.F. 1961, ApJ, 133, 438. 2.66333BBB open cluster NGC 6633, BBB=number from Hiltner, W. et al., 1958, ApJ, 127, 539. 2.66563BBB globular cluster NGC 6656 (M22), BBB= number from Zdanavicius, K. 1992, Baltic Astronomy, 1, 17. 2.6705BBBB open cluster NGC 6705 (Mil), BBBB= number from McNamara B.J. et al. 1977, A&AS, 27, 117. 2.6811BBBB open cluster NGC 6811, BBBB= number from Lindoff, U. 1972, A&AS, 16, 315. 2.68113BBB open cluster NGC 6811, BBB= number from Sanders, W.L. 1971, A&A, 15, 368. 2.68383BBB globular cluster NGC 6838 (M71), BBB= number from Zdanavicius, K. 1992, Baltic Astronomy, 1, 17. 2.6882BBBB open cluster NGC 6882-5, BBBB= number from Hoag, A.A. et al., 1961, Publ. Naval Obs., 17, 347. 2.69103BBB open cluster NGC 6910, BBB= number from Tifft, W.G. 1958, AJ, 63, 127. 2.69133BBB open cluster NGC 6913, BBB= number from Sanders, W.L. 1973, A&AS, 9, 221. 2.70393BBB open cluster NGC 7039, BBB= number from Dzervitis, U. and Paupers, 0. 1989, Investig. of the Sun and Red Stars, Riga, No. 30, 5. 2.70923BBB open cluster NGC 7092, BBB=number from Ebbighousen, E.G. 1940, ApJ, 92, 434. 2.7686BBBB open cluster NGC 7686, BBBB= number from Hoag, A.A. et al., 1961, Publ. Naval Obs. 17, 347. 3.1805BBBB open cluster IC 1805, BBBB= number from Vasilevskis, S. 1965, AJ, 70, 806. General Photometrie Catalogue. 9 3.4756BBBB open cluster IC 4756, BBBB= number from Kopff, E. 1943, Astron. Nachr., 274, 69. 3.4996BBBB open cluster IC 4996, BBBB= number from van Schewick, H.
Load more

Recommended publications
  • A Search for Pulsations in Helium White Dwarfs
    DRAFT VERSION OCTOBER 13, 2018 Preprint typeset using LATEX style emulateapj v. 11/10/09 A SEARCH FOR PULSATIONS IN HELIUM WHITE DWARFS JUSTIN D. R. STEINFADT1,LARS BILDSTEN1,2,DAVID L. KAPLAN3,BENJAMIN J. FULTON4,STEVE B. HOWELL5, T. R. MARSH6 , ERAN O. OFEK7,8 , AND AVI SHPORER1,4 Draft version October 13, 2018 ABSTRACT The recent plethora of sky surveys, especially the Sloan Digital Sky Survey, have discovered many low- mass (M < 0.45M⊙) white dwarfs that should have cores made of nearly pure helium. These WDs come in two varieties; those with masses 0.2 < M < 0.45M⊙ and H envelopes so thin that they rapidly cool, and those with M < 0.2M⊙ (often called extremely low mass, ELM, WDs) that have thick enough H envelopes to sustain 109 years of H burning. In both cases, these WDs evolve through the ZZ Ceti instability strip, Teff ≈ 9,000–12,000K, where g-mode pulsations always occur in Carbon/Oxygen WDs. This expectation, plus theoretical work on the contrasts between C/O and He core WDs, motivated our search for pulsations in 12 well characterized helium WDs. We report here on our failure to find any pulsators amongst our sample. Though we have varying amplitude limits, it appears likely that the theoretical expectations regarding the onset of pulsations in these objects requires closer consideration. We close by encouraging additional observations as new He WD samples become available, and speculate on where theoretical work may be needed. Subject headings: stars: white dwarfs— stars: oscillations 1. INTRODUCTION for C/O-core WDs.
    [Show full text]
  • Frankfurt Pleiades Star Map 2
    FRANKFURT PLEIADES STAR MAP 2 In investigating the Martian connection of the Pleiadian pattern of Frankfurt, one cannot avoid to address the origins at least in the propagation of this motif in the modern era and in all the financial powerhouses of today’s World Financial Oder. This is in part the Pleiades conspiracy as this modern version of the ‘Pleiadian Conspiracy’ started here in Frankfurt with the Rothschild dynasty by Amschel Moses Bauer, 1743. This critique is not meant to placate all those of the said family or those that work in such financial structures or businesses and specifically not those in Frankfurt. However the argument is that those behind the family apparatus are of a cabal that is connected to the allegiance of not the true GOD of the Universe, YHVH but to the false usurper Lucifer. It is Lucifer they worship and venerate as the ‘god of this world’ and is the God of Mammon according to Jesus’ assessment. According to research and especially based on The 13 Bloodlines of the Illuminati by Springmeier, the current financial domination of the world began in Frankfurt with Mayer Amschel. They were of Jewish extract but adhere more toward the Kabbalistic, Zohar, and ancient Babylonian secret mystery religion initiated by Nimrod after the Flood of Noah. The star Taygete corresponds to the Literaturahaus building. T he star Celaena corresponds to the Burgenamt Zentrales building. The star Merope corresponds to the area of the Timmitus und THE PLEIADES Hyperakusis Center. The star Alcyone corresponds to the Oper FINANCIAL DISTRICT The Bearing-Point building is Frankfurt or the Opera House.
    [Show full text]
  • A Review on Substellar Objects Below the Deuterium Burning Mass Limit: Planets, Brown Dwarfs Or What?
    geosciences Review A Review on Substellar Objects below the Deuterium Burning Mass Limit: Planets, Brown Dwarfs or What? José A. Caballero Centro de Astrobiología (CSIC-INTA), ESAC, Camino Bajo del Castillo s/n, E-28692 Villanueva de la Cañada, Madrid, Spain; [email protected] Received: 23 August 2018; Accepted: 10 September 2018; Published: 28 September 2018 Abstract: “Free-floating, non-deuterium-burning, substellar objects” are isolated bodies of a few Jupiter masses found in very young open clusters and associations, nearby young moving groups, and in the immediate vicinity of the Sun. They are neither brown dwarfs nor planets. In this paper, their nomenclature, history of discovery, sites of detection, formation mechanisms, and future directions of research are reviewed. Most free-floating, non-deuterium-burning, substellar objects share the same formation mechanism as low-mass stars and brown dwarfs, but there are still a few caveats, such as the value of the opacity mass limit, the minimum mass at which an isolated body can form via turbulent fragmentation from a cloud. The least massive free-floating substellar objects found to date have masses of about 0.004 Msol, but current and future surveys should aim at breaking this record. For that, we may need LSST, Euclid and WFIRST. Keywords: planetary systems; stars: brown dwarfs; stars: low mass; galaxy: solar neighborhood; galaxy: open clusters and associations 1. Introduction I can’t answer why (I’m not a gangstar) But I can tell you how (I’m not a flam star) We were born upside-down (I’m a star’s star) Born the wrong way ’round (I’m not a white star) I’m a blackstar, I’m not a gangstar I’m a blackstar, I’m a blackstar I’m not a pornstar, I’m not a wandering star I’m a blackstar, I’m a blackstar Blackstar, F (2016), David Bowie The tenth star of George van Biesbroeck’s catalogue of high, common, proper motion companions, vB 10, was from the end of the Second World War to the early 1980s, and had an entry on the least massive star known [1–3].
    [Show full text]
  • Why Are There Seven Sisters?
    Why are there Seven Sisters? Ray P. Norris1,2 & Barnaby R. M. Norris3,4,5 1 Western Sydney University, Locked Bag 1797, Penrith South, NSW 1797, Australia 2 CSIRO Astronomy & Space Science, PO Box 76, Epping, NSW 1710, Australia 3 Sydney Institute for Astronomy, School of Physics, Physics Road, University of Sydney, NSW 2006, Australia 4 Sydney Astrophotonic Instrumentation Laboratories, Physics Road, University of Sydney, NSW 2006, Australia 5 AAO-USyd, School of Physics, University of Sydney, NSW 2006, Australia Abstract of six stars arranged symmetrically around a seventh, and is There are two puzzles surrounding the therefore probably symbolic rather than a literal picture of Pleiades, or Seven Sisters. First, why are the Pleiades. the mythological stories surrounding them, In Greek mythology, the Seven Sisters are named after typically involving seven young girls be- the Pleiades, who were the daughters of Atlas and Pleione. ing chased by a man associated with the Their father, Atlas, was forced to hold up the sky, and was constellation Orion, so similar in vastly sep- therefore unable to protect his daughters. But to save them arated cultures, such as the Australian Abo- from being raped by Orion the hunter, Zeus transformed them riginal cultures and Greek mythology? Sec- into stars. Orion was the son of Poseidon, the King of the sea, ond, why do most cultures call them “Seven and a Cretan princess. Orion first appears in ancient Greek Sisters" even though most people with good calendars (e.g. Planeaux , 2006), but by the late eighth to eyesight see only six stars? Here we show that both these puzzles may be explained by early seventh centuries BC, he is said to be making unwanted a combination of the great antiquity of the advances on the Pleiades (Hesiod, Works and Days, 618-623).
    [Show full text]
  • An Asymmetric Planetary Nebula with a Binary Central Star
    CSIRO PUBLISHING www.publish.csiro.au/journals/pasa Publications of the Astronomical Society of Australia, 2011, 28, 83–94 K 1-6: An Asymmetric Planetary Nebula with a Binary Central Star David J. FrewA,I, Jeff StangerB, Michael FitzgeraldA, Quentin ParkerA,C, Lena DanaiaD, David McKinnonD, Martín A. GuerreroE,F, John HedbergG, Robert HollowH, Yvonne AnB, Shu Han BorB, Isabel ColmanB, Claire Graham-WhiteB, Qing Wen LiB, Juliette MaiB, Katerina PapadakisB, Julia Picone-MurrayB, Melanie Vo HoangB, and Vivian YeanB A Department of Physics and Astronomy, Macquarie University, North Ryde, NSW 2109, Australia B Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia C Australian Astronomical Observatory, PO Box 296, Epping, NSW 1710, Australia D School of Teacher Education, Charles Sturt University, Bathurst, NSW 2795, Australia E Instituto de Astrofı´sica de Andalucı´a, CSIC, c/Camino Bajo de Hue´tor 50, E-18008 Granada, Spain F Present address: Macquarie University, North Ryde, NSW 2109, Australia G Department of Education, Macquarie University, North Ryde, NSW 2109, Australia H CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia I Corresponding author. Email: [email protected] Received 2010 May 18, accepted 2010 September 22 Abstract: We present new imaging data and archival multiwavelength observations of the little-studied emission nebula K 1-6 and its central star. Narrow-band images in Ha (þ[N II]) and [O III] taken with the Faulkes Telescope North reveal a stratified, asymmetric, elliptical nebula surrounding a central star which has the colours of a late G or early K-type subgiant or giant.
    [Show full text]
  • Software for Aerospace Educationa Bibliography (Second Edition)
    DOCUMENT RESUME ED 312 134 SE 050 904 AUTHOR Vogt, Gregory L.; And Others TITLE Software for Aerospace EducationA Bibliography (Second Edition). INSTITUTION National Aeronautics and Space Administration, Washington, DC. Education Technology Branch. REPORT NO NASA-PED-106 PUB DATE 89 NOTE 91p. PUB TYPE plok/Product Reviews (072) -- Reference Materials - Bibliographies (131) EDRS PRICE MF01/PC04 Plus Postage. DESCRIPTORS *Aerospace Education; Astronomy; *Computer Software; *Computer Software Reviews; *Databases; Elementary School Science; Elementary Secondary Education; Engineering Education; Satellites (Aerospace); Science Fiction; Science Materials; Secondary School Science; *Videodisks IDENTIFIERS National Aeronautics and Space Administration ABSTRACT The software described in this bibliography represents programs made available to the National Aeronautics and Space Administration (NASA) Educational Technology Branch by software producers and vendors. More than 200 computer software programs and 12 laser videodisk programs are reviewed in terms of title, copyright, subject, application, type, grade level, minimum system requir3ments, description, components, features, producer, vendor, and cost. Subject areas covered include: (1) aeronautics; (2) aerospace physics; (3) astronomy; (4) manned space exploration; (5) rocketry; (6) satellites; and (7) science fiction. The last section describes how to use the NASA SpaceLink which is a 24-hour computer information database developed to serve teachers and other educators. Lists of vendors and NASA Teacher Resource Centers are appended. (YP) Reproductions supplied by EDRS are the best that can be made from the original document. Mr sr. O4 i< t E r° 0 2 I. .14l v r3E 51 B `g fh g gc .2- to ch. s 0 ''' t I .1 tacciu'i .cg2; o < 3. f.
    [Show full text]
  • Mecoptera: Meropeidae): Simply Dull Or Just Inscrutable?
    University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Center for Systematic Entomology, Gainesville, Insecta Mundi Florida 8-24-2007 Etymology of the earwigfly, Merope tuber Newman (Mecoptera: Meropeidae): Simply dull or just inscrutable? Louis A. Somma University of Florida, [email protected] James C. Dunford University of Florida, Gainesville, FL Follow this and additional works at: https://digitalcommons.unl.edu/insectamundi Part of the Entomology Commons Somma, Louis A. and Dunford, James C., "Etymology of the earwigfly, Merope tuber Newman (Mecoptera: Meropeidae): Simply dull or just inscrutable?" (2007). Insecta Mundi. 65. https://digitalcommons.unl.edu/insectamundi/65 This Article is brought to you for free and open access by the Center for Systematic Entomology, Gainesville, Florida at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Insecta Mundi by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. INSECTA MUNDI A Journal of World Insect Systematics 0013 Etymology of the earwigfly, Merope tuber Newman (Mecoptera: Meropeidae): Simply dull or just inscrutable? Louis A. Somma Department of Zoology PO Box 118525 University of Florida Gainesville, FL 32611-8525 [email protected] James C. Dunford Department of Entomology and Nematology PO Box 110620, IFAS University of Florida Gainesville, FL 32611-0620 [email protected] Date of Issue: August 24, 2007 CENTER FOR SYSTEMATIC ENTOMOLOGY, INC., Gainesville, FL Louis A. Somma and James C. Dunford Etymology of the earwigfly, Merope tuber Newman (Mecoptera: Meropeidae): Simply dull or just inscrutable? Insecta Mundi 0013: 1-5 Published in 2007 by Center for Systematic Entomology, Inc. P. O. Box 147100 Gainesville, FL 32604-7100 U.
    [Show full text]
  • Galactic Center: an Improved Astrometric Reference Frame for Stellar Orbits Around the Supermassive Black Hole Shoko Sakai,1 Jessica R
    Draft version January 28, 2019 Typeset using LATEX twocolumn style in AASTeX62 The Galactic Center: An Improved Astrometric Reference Frame for Stellar Orbits around the Supermassive Black Hole Shoko Sakai,1 Jessica R. Lu,2 Andrea Ghez,1 Siyao Jia,2 Tuan Do,1 Gunther Witzel,1 Abhimat K. Gautam,1 Aurelien Hees,3, 1 E. Becklin,1 K. Matthews,4 and M. W. Hosek Jr.5 1UCLA Department of Physics and Astronomy, Los Angeles, CA 90095-1547, USA 2Astronomy Department, University of California, Berkeley, CA 94720, USA 3SYRTE, Observatoire de Paris, Universit´ePSL, CNRS, Sorbonne Universit´e,LNE, 61 avenue de l’Observatoire 75014 Paris 4Astrophysics, California Institute of Technology, MC 249-17, Pasadena, CA 91125, USA 5Institute for Astronomy, University of Hawaii, Honolulu, HI 96822, USA (Received; Revised; Accepted) Submitted to ApJ ABSTRACT Precision measurements of the stars in short-period orbits around the supermassive black hole at the Galactic Center are now being used to constrain general relativistic effects, such as the gravitational redshift and periapse precession. One of the largest systematic uncertainties in the measured orbits has been errors in the astrometric reference frame, which is derived from seven infrared-bright stars associated with SiO masers that have extremely accurate radio positions, measured in the Sgr A*-rest frame. We have improved the astrometric reference frame within 1400 of the Galactic Center by a factor of 2.5 in position and a factor of 5 in proper motion. In the new reference frame, Sgr A* is localized to within a position of 0.645 mas and proper motion of 0.03 mas yr−1.
    [Show full text]
  • GTO Keypad Manual, V5.001
    ASTRO-PHYSICS GTO KEYPAD Version v5.xxx Please read the manual even if you are familiar with previous keypad versions Flash RAM Updates Keypad Java updates can be accomplished through the Internet. Check our web site www.astro-physics.com/software-updates/ November 11, 2020 ASTRO-PHYSICS KEYPAD MANUAL FOR MACH2GTO Version 5.xxx November 11, 2020 ABOUT THIS MANUAL 4 REQUIREMENTS 5 What Mount Control Box Do I Need? 5 Can I Upgrade My Present Keypad? 5 GTO KEYPAD 6 Layout and Buttons of the Keypad 6 Vacuum Fluorescent Display 6 N-S-E-W Directional Buttons 6 STOP Button 6 <PREV and NEXT> Buttons 7 Number Buttons 7 GOTO Button 7 ± Button 7 MENU / ESC Button 7 RECAL and NEXT> Buttons Pressed Simultaneously 7 ENT Button 7 Retractable Hanger 7 Keypad Protector 8 Keypad Care and Warranty 8 Warranty 8 Keypad Battery for 512K Memory Boards 8 Cleaning Red Keypad Display 8 Temperature Ratings 8 Environmental Recommendation 8 GETTING STARTED – DO THIS AT HOME, IF POSSIBLE 9 Set Up your Mount and Cable Connections 9 Gather Basic Information 9 Enter Your Location, Time and Date 9 Set Up Your Mount in the Field 10 Polar Alignment 10 Mach2GTO Daytime Alignment Routine 10 KEYPAD START UP SEQUENCE FOR NEW SETUPS OR SETUP IN NEW LOCATION 11 Assemble Your Mount 11 Startup Sequence 11 Location 11 Select Existing Location 11 Set Up New Location 11 Date and Time 12 Additional Information 12 KEYPAD START UP SEQUENCE FOR MOUNTS USED AT THE SAME LOCATION WITHOUT A COMPUTER 13 KEYPAD START UP SEQUENCE FOR COMPUTER CONTROLLED MOUNTS 14 1 OBJECTS MENU – HAVE SOME FUN!
    [Show full text]
  • And A-Type Stars in the Taurus
    DRAFT OF FEBRUARY 28, 2013 B- AND A-TYPE STARS IN THE TAURUS-AURIGA STAR FORMING REGION KUNAL MOOLEY1 ,LYNNE HILLENBRAND1 ,LUISA REBULL2 ,DEBORAH PADGETT 2,4 , AND GILLIAN KNAPP3 1Department of Astronomy, California Institute of Technology, 1200 E. California Blvd., MC 249-17, Pasadena, CA 91125, USA; [email protected] 2Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125, USA 3Department of Astrophysics, Princeton University, Princeton, NJ, USA and 4current address: Goddard Space Flight Center, Greenbelt, MD, USA Draft of February 28, 2013 ABSTRACT We describe the results of a search for early-type stars associated with the Taurus-Auriga molecular cloud complex, a diffuse nearby star-forming region typically noted as lacking young stars of intermediate and high mass. We investigate several sets of possible O, B and early A spectral class members. The first set is a group of stars for which mid-infrared images show bright nebulae, all of which can be associated with stars of spectral type B. We model the scattered and emitted radiation from the reflection nebulosity and compare the results with the observed spectral energy distributions to test the plausibility of association of the B stars with the cloud. The second group of candidates investigated consists of early-type stars compiled from (i) literature listings in SIMBAD; (ii) B stars with infrared excesses selected from the Spitzer Space Telescope survey of the Taurus cloud; (iii) magnitude- and color-selected point sources from the Two Micron All Sky Survey; and (iv) spectroscopically identified early-type stars from the Sloan Digital Sky Survey coverage of the Taurus region.
    [Show full text]
  • The Pleiades: the Celestial Herd of Ancient Timekeepers
    The Pleiades: the celestial herd of ancient timekeepers. Amelia Sparavigna Dipartimento di Fisica, Politecnico di Torino C.so Duca degli Abruzzi 24, Torino, Italy Abstract In the ancient Egypt seven goddesses, represented by seven cows, composed the celestial herd that provides the nourishment to her worshippers. This herd is observed in the sky as a group of stars, the Pleiades, close to Aldebaran, the main star in the Taurus constellation. For many ancient populations, Pleiades were relevant stars and their rising was marked as a special time of the year. In this paper, we will discuss the presence of these stars in ancient cultures. Moreover, we will report some results of archeoastronomy on the role for timekeeping of these stars, results which show that for hunter-gatherers at Palaeolithic times, they were linked to the seasonal cycles of aurochs. 1. Introduction Archeoastronomy studies astronomical practices and related mythologies of the ancient cultures, to understand how past peoples observed and used the celestial phenomena and what was the role played by the sky in their cultures. This discipline is then a branch of the cultural astronomy, an interdisciplinary field that relates astronomical phenomena to current and ancient cultures. It must then be distinguished from the history of astronomy, because astronomy is a culturally specific concept and ancient peoples may have been related to the sky in different way [1,2]. Archeoastronomy is considered as a quite new interdisciplinary science, rooted in the Stonehenge studies of 1960s by the astronomer Gerald Hawkins, who tested Stonehenge alignments by computer, and concluded that these stones marked key dates in the megalithic calendar [3].
    [Show full text]
  • Variable Star Section Circular
    British Astronomical Association VARIABLE STAR SECTION CIRCULAR No 90, December 1996 Contents A Selection of Light Curves ............................................................................. 1 General News ................................................................................................... 2 Recurrent Objects Programme News ............................................................... 3 Chart News ....................................................................................................... 4 Binocular Priority Stars in 1995 ...................................................................... 5 Asteroid-Variable Appulses: a short list to 2000 ........................................... 10 Comments on the VSS Observers Questionnaire .......................................... 12 VSS Meeting: part 1....................................................................................... 14 Photoelectric Minima of Eclipsing Binaries 1995 ......................................... 16 Recent Papers on Variable Stars .................................................................... 17 IBVS............................................................................................................... 18 Eclipsing Binary Predictions .......................................................................... 19 New Chart for CH Cyg................................................................................... 22 ISSN 0267-9272 Office: Burlington House, Piccadilly, London, W1V 9AG A SELECTION OF LIGHT CURVES
    [Show full text]