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CCD UBV Photometry and Kinematics of the Open Cluster NGC
CCD UBV Photometry and Kinematics of the Open Cluster NGC 225 Sel¸cuk Bilira,∗, Z. Funda Bostancıa, Talar Yontanb, Tolga G¨uvera, Volkan Bakı¸sc, Tansel Aka, Serap Aka, Ernst Paunzend, Zeki Ekerc aIstanbul University, Faculty of Science, Department of Astronomy and Space Sciences, 34119 University, Istanbul, Turkey bIstanbul University, Graduate School of Science and Engineering, Department of Astronomy and Space Sciences, 34116, Beyazıt, Istanbul, Turkey cDepartment of Space Sciences and Technologies, Faculty of Sciences, Akdeniz University, Antalya 07058, Turkey dDepartment of Theoretical Physics and Astrophysics, Masaryk University, Kotl´a˘rsk´a2, 611 37 Brno, Czech Republic Abstract We present the results of CCD UBV photometric and spectroscopic obser- vations of the open cluster NGC 225. In order to determine the structural parameters of NGC 225, we calculated the stellar density profile in the clus- ter’s field. We estimated the probabilities of the stars being physical members of the cluster using the existing astrometric data. The most likely members of the cluster were used in the determination of the astrophysical parame- ters of the cluster. We calculated the mean radial velocity of the cluster as −1 Vr = 8.3 5.0 km s from the optical spectra of eight stars in the cluster’s field.− Using± the U B vs B V two-colour diagram and UV excesses of the F- − − G type main-sequence stars, the reddening and metallicity of NGC 225 were inferred as E(B V )=0.151 0.047 mag and [Fe/H]= 0.11 0.01 dex, respectively. We− fitted the colour-magnitude± diagrams of NGC− 225± with the arXiv:1606.08608v1 [astro-ph.GA] 28 Jun 2016 PARSEC isochrones and derived the distance modulus, distance and age of the cluster as µ =9.3 0.07 mag, d = 585 20 pc and t = 900 100 Myr, V ± ± ± respectively. -
Sunday October 19, 2014
Sunday October 19, 2014 Decided to use the Little Thompson Observatory’s telescopes tonight. I couldn’t connect to the 24”. Had connection failure issues. So I used the 18” f/14.2 and the 6” f/6 telescopes tonight. The 40mm eyepiece in 18” is 162x. The 22mm eyepiece in 6” is 41.5x. 7:00 PM. 68 degrees. Sky is clear. Wind is calm. Getting dark. Seeing and transparency Good. NGC 6929 7:27 PM 162x – Under a dim field star is this lopsided, faint, tiny oval glow. Glow goes to 2 o’clock from this star a tiny bit. Glow uniformly lit. NGC 6852 7:32 PM 162x – A brighter white star with very faint circular halo glow around it. With O3 see the halo a bit better and brighter. Star still prominent. NGC 6843 7:35 PM 162x – 7 very dim stars form this asterism in a small, rough circular pattern. NGC 6858 7:37 PM 162x – An asterism of 9 very dim stars in a diamond shape. NGC 6773 7:39 PM 162x – 5 stars form a box of 3 magnitudes with brightest still dim. PK 38-25.1 7:45 PM 162x – A stellar PN. A brighter white star. With O3, see a tiny bit of halo around it. It is small and hard to see. Looks like an out of focus star. Pal 11 7:49 PM 162x – With AV and waiting, see 3-4 very faint stars once in a while. In between a nice asterism pattern where picture shows it should be and where these 3-4 stars pop in. -
Astronomy Magazine Special Issue
γ ι ζ γ δ α κ β κ ε γ β ρ ε ζ υ α φ ψ ω χ α π χ φ γ ω ο ι δ κ α ξ υ λ τ μ β α σ θ ε β σ δ γ ψ λ ω σ η ν θ Aι must-have for all stargazers η δ μ NEW EDITION! ζ λ β ε η κ NGC 6664 NGC 6539 ε τ μ NGC 6712 α υ δ ζ M26 ν NGC 6649 ψ Struve 2325 ζ ξ ATLAS χ α NGC 6604 ξ ο ν ν SCUTUM M16 of the γ SERP β NGC 6605 γ V450 ξ η υ η NGC 6645 M17 φ θ M18 ζ ρ ρ1 π Barnard 92 ο χ σ M25 M24 STARS M23 ν β κ All-in-one introduction ALL NEW MAPS WITH: to the night sky 42,000 more stars (87,000 plotted down to magnitude 8.5) AND 150+ more deep-sky objects (more than 1,200 total) The Eagle Nebula (M16) combines a dark nebula and a star cluster. In 100+ this intense region of star formation, “pillars” form at the boundaries spectacular between hot and cold gas. You’ll find this object on Map 14, a celestial portion of which lies above. photos PLUS: How to observe star clusters, nebulae, and galaxies AS2-CV0610.indd 1 6/10/10 4:17 PM NEW EDITION! AtlAs Tour the night sky of the The staff of Astronomy magazine decided to This atlas presents produce its first star atlas in 2006. -
A Basic Requirement for Studying the Heavens Is Determining Where In
Abasic requirement for studying the heavens is determining where in the sky things are. To specify sky positions, astronomers have developed several coordinate systems. Each uses a coordinate grid projected on to the celestial sphere, in analogy to the geographic coordinate system used on the surface of the Earth. The coordinate systems differ only in their choice of the fundamental plane, which divides the sky into two equal hemispheres along a great circle (the fundamental plane of the geographic system is the Earth's equator) . Each coordinate system is named for its choice of fundamental plane. The equatorial coordinate system is probably the most widely used celestial coordinate system. It is also the one most closely related to the geographic coordinate system, because they use the same fun damental plane and the same poles. The projection of the Earth's equator onto the celestial sphere is called the celestial equator. Similarly, projecting the geographic poles on to the celest ial sphere defines the north and south celestial poles. However, there is an important difference between the equatorial and geographic coordinate systems: the geographic system is fixed to the Earth; it rotates as the Earth does . The equatorial system is fixed to the stars, so it appears to rotate across the sky with the stars, but of course it's really the Earth rotating under the fixed sky. The latitudinal (latitude-like) angle of the equatorial system is called declination (Dec for short) . It measures the angle of an object above or below the celestial equator. The longitud inal angle is called the right ascension (RA for short). -
The HST Key Project on the Extragalactic Distance Scale XIV
c The HST Key Project on the Extragalactic Distance Scale XIV. The Cepheids in NGC 1365' N. A. Silbermann,2 Paul Laura Ferrare~e,~Peter B. Stetson,5Barry F. Madore,' Robert C. Kennicutt, Jr.,3 Wendy L. ,Freedman,7.Jeremy R. i\/lould,' Fabio Bre~olin,~ HollandBrad E;. Gibson,' John A. Graham,"Mingsheng Han," John G. 'Based on observations with the NASA/ESA HubbleSpace Telescope obtained at the Space Telescope Science Institute, which is operated by AURA, Inc. under NASA Contract No. NAS5-265.55. 21nfrared Processing and Analysis Center, Jet Propulsion Laboratory, California Institute of Technology, MS 100-22, Pasadena, CA 91125 3Steward Observatory, University of Arizona, Tucson, A2 85721 4Hubble Fellow, California Institute of Technology, Pasadena, CA 91125 5Dominion Astrophysical Observatory, Victoria, British Columbia V8X 4M6 Canada 'NASA ExtragalacticDatabase, Infrared Processing and A4nalysis Center, California Institute of Technology, MS 100-22, Pasadena, CA 91125 70bservatories of the Carnegie Institution of Washington, Pa,sadena CA 91101 'Mount Stromlo and Siding Spring Observatories, Institute of Advanced Studies, ANU, ACT 2611 Australia 'Johns Hopkins University and Space Telescope Science Institute, Baltimore, MD 21218 "Dept. of Terrestrial Magnetism, Carnegie Institution of \Va.shington, Washington D.C. 20015 "University of Wisconsin, Madison, Wisconsin 53706 -- .j ~ ABSTRACT We report the detection of Clepheicl variable stars in the barred spiral galaxy NGC 1365, located in the Fornax cluster, using the Hubble Space Telescope Wide Field and Planetary Camera 2. Twelve V (F555W) and four I (F814W) epochs of observation were obtained. The two photometry packages, ALLFRAME and DoPHOT, were separately used to obtain profile-fitting photometry of all the stars in the HST field. -
2014 Observers Challenge List
2014 TMSP Observer's Challenge Atlas page #s # Object Object Type Common Name RA, DEC Const Mag Mag.2 Size Sep. U2000 PSA 18h31m25s 1 IC 1287 Bright Nebula Scutum 20'.0 295 67 -10°47'45" 18h31m25s SAO 161569 Double Star 5.77 9.31 12.3” -10°47'45" Near center of IC 1287 18h33m28s NGC 6649 Open Cluster 8.9m Integrated 5' -10°24'10" Can be seen in 3/4d FOV with above. Brightest star is 13.2m. Approx 50 stars visible in Binos 18h28m 2 NGC 6633 Open Cluster Ophiuchus 4.6m integrated 27' 205 65 Visible in Binos and is about the size of a full Moon, brightest star is 7.6m +06°34' 17h46m18s 2x diameter of a full Moon. Try to view this cluster with your naked eye, binos, and a small scope. 3 IC 4665 Open Cluster Ophiuchus 4.2m Integrated 60' 203 65 +05º 43' Also check out “Tweedle-dee and Tweedle-dum to the east (IC 4756 and NGC 6633) A loose open cluster with a faint concentration of stars in a rich field, contains about 15-20 stars. 19h53m27s Brightest star is 9.8m, 5 stars 9-11m, remainder about 12-13m. This is a challenge obJect to 4 Harvard 20 Open Cluster Sagitta 7.7m integrated 6' 162 64 +18°19'12" improve your observation skills. Can you locate the miniature coathanger close by at 19h 37m 27s +19d? Constellation star Corona 5 Corona Borealis 55 Trace the 7 stars making up this constellation, observe and list the colors of each star asterism Borealis 15H 32' 55” Theta Corona Borealis Double Star 4.2m 6.6m .97” 55 Theta requires about 200x +31° 21' 32” The direction our Sun travels in our galaxy. -
Possible Groupings of Irregular (Orion) Variables
POSSIBLE GROUPINGS OF IRREGULAR (ORION) VARIABLES M. V. DOLIDZE Abastumani Observatory, Abastumani, Georgia, U.S.S.R. Abstract. New groupings of Ha-emission stars connected with young clusters, asso ciations and nebulae are considered to be possible regions of clusterings of irregular (Orion-type) variables. They are listed in Table I and an example, No. 19, is shown in Figure 1. Finding charts of individual stars and more detailed data will be given in two forth coming papers in the Bulletins of the Abastumani Astrophysical Observatory. TABLE I Regions of possible clustering of irregular (Orion) variables (1) (2) (3) (4) (5) (6) (7) No. Regions Ha ai9oo &900 Central Type em. O or T Ass 1 NGC 281 +Kh 215 1 00h45™2 55°51' a: 2 IC 1805; 1795 + Kh 237 11 02 25.2 61 01 43, Cas OB 6 b: 2 O CI 357, NGC 1027 1 02 35.0 61 07 43, Cas OB 6 3 S126, OC1 435 + Kh281 2 05 08.1 32 37 8, IC 405 a:; c 4 MWC 789 + Kh 297 1 05 56.4 16 49 a 4 S34, McD 43 + Kh 297 1 06 03.3 15 48 5 IC 4601+Kh 569 1 16 15.5 -20 00 v Sco a: 6 S 190 4 18 13.0 -12 00 9, Ser OB 2 7 OC1 38, IC 4725 + D 1 18 25.0 -19 19 c 8 NGC 6820, 6823 3 19 39.0 23 06 13, Vul OB 1 b: 9 OC1 An (Do 1974)+ D 4 19 40.7 24 20 14, Vul OB 4 b:;c: 10 S 67, B 346 6 20 21.5 43 00 39, T2 Cyg a: 11 Kh 100 3 20 38.0 33 20 a: 12 S86 + D 1 21 00.3 59 04 13 S88 + Kh 127 1 21 15.2 42 57 14 near (NGC 7086 + Kh 141) 2 21 25.0 49 50 15 Kh 160 5 21 47.1 55 56 27, Cep OB 2 a: 16 Kh 172 5 22 01.6 58 48 a: 16 S94, Mi 16 + D 9 22 20.2 58 17 17 S95, McD 30+ D 2 22 21.4 63 04 16 S96, W94 + D 5 22 33.2 58 00 18 O CI 248, An (King 10) + D 4 22 51.0 58 36 c; d 19 Sh 155+ D 10 22 52.3 62 00 30, Cep OB 3 b:; d 20 MWC 1080 + D 4 23 11.7 60 20 a 21 Kh 198 1 23 50.8 58 03 a: Sherwood and Plaut (eds.), Variable Stars and Stellar Evolution, 109-111. -
SAC's 110 Best of the NGC
SAC's 110 Best of the NGC by Paul Dickson Version: 1.4 | March 26, 1997 Copyright °c 1996, by Paul Dickson. All rights reserved If you purchased this book from Paul Dickson directly, please ignore this form. I already have most of this information. Why Should You Register This Book? Please register your copy of this book. I have done two book, SAC's 110 Best of the NGC and the Messier Logbook. In the works for late 1997 is a four volume set for the Herschel 400. q I am a beginner and I bought this book to get start with deep-sky observing. q I am an intermediate observer. I bought this book to observe these objects again. q I am an advance observer. I bought this book to add to my collect and/or re-observe these objects again. The book I'm registering is: q SAC's 110 Best of the NGC q Messier Logbook q I would like to purchase a copy of Herschel 400 book when it becomes available. Club Name: __________________________________________ Your Name: __________________________________________ Address: ____________________________________________ City: __________________ State: ____ Zip Code: _________ Mail this to: or E-mail it to: Paul Dickson 7714 N 36th Ave [email protected] Phoenix, AZ 85051-6401 After Observing the Messier Catalog, Try this Observing List: SAC's 110 Best of the NGC [email protected] http://www.seds.org/pub/info/newsletters/sacnews/html/sac.110.best.ngc.html SAC's 110 Best of the NGC is an observing list of some of the best objects after those in the Messier Catalog. -
Open Clusters
Open Clusters Open clusters (also known as galactic clusters) are of tremendous importance to the science of astronomy, if not to astrophysics and cosmology generally. Star clusters serve as the "laboratories" of astronomy, with stars now all at nearly the same distance and all created at essentially the same time. Each cluster thus is a running experiment, where we can observe the effects of composition, age, and environment. We are hobbled by seeing only a snapshot in time of each cluster, but taken collectively we can understand their evolution, and that of their included stars. These clusters are also important tracers of the Milky Way and other parent galaxies. They help us to understand their current structure and derive theories of the creation and evolution of galaxies. Just as importantly, starting from just the Hyades and the Pleiades, and then going to more distance clusters, open clusters serve to define the distance scale of the Milky Way, and from there all other galaxies and the entire universe. However, there is far more to the study of star clusters than that. Anyone who has looked at a cluster through a telescope or binoculars has realized that these are objects of immense beauty and symmetry. Whether a cluster like the Pleiades seen with delicate beauty with the unaided eye or in a small telescope or binoculars, or a cluster like NGC 7789 whose thousands of stars are seen with overpowering wonder in a large telescope, open clusters can only bring awe and amazement to the viewer. These sights are available to all. -
Distant Arm - NGC772
29 September 2016, Zeiss Cas 150/2250 Distant Arm - NGC772 Telescope: Zeiss Cassegrain 150/2250 Eyepieces: ATC53P - ATC Plossl, f=53mm, (42×, 530) ATC20K - ATC Kellner, f=20mm, (113×, 220) A-16 - Zeiss Abbe Ortho, f=16mm, (141×, 200) O-12.5 - CZJ Ortho, f=12.5mm, (180×, 140) Time: 2016/09/29 19:30-21:40UT Location: R´ıˇcanyˇ Weather: Clear sky with slight haze and decaying small thin clouds. Mount: Zeiss 1b Accessories: Baader/Zeiss T2 prism This was my typical backyard session. I could go out only for a short time after I put all three kids in to their beds. The night was still warm. Normally, I would try to take an advantage of it and go to some darker place. As I was alone with the kids for the whole week I was bound to stay in our backyard. During last couple of years, I have learnt to live with this handicap. There is always something interesting to look at, even with small refractors. Recently, I was explor- ing the capability of my largest telescope, 150mm Cassegrain. For this night, the main targets were two galaxies, NGC 660 and NGC 772, which I had troubles to locate two days before in 80mm refractor. I was curios how much of help the larger telescope would be. I did not jump to these two galaxies im- mediately. They were still low in the slight haze enhanced by the street lamps. I started a little bit higher in Andromeda with beau- tiful edge-on galaxy NGC 891 (V=10.0, 13:50 ×2:50, PA22◦). -
Atlas Menor Was Objects to Slowly Change Over Time
C h a r t Atlas Charts s O b by j Objects e c t Constellation s Objects by Number 64 Objects by Type 71 Objects by Name 76 Messier Objects 78 Caldwell Objects 81 Orion & Stars by Name 84 Lepus, circa , Brightest Stars 86 1720 , Closest Stars 87 Mythology 88 Bimonthly Sky Charts 92 Meteor Showers 105 Sun, Moon and Planets 106 Observing Considerations 113 Expanded Glossary 115 Th e 88 Constellations, plus 126 Chart Reference BACK PAGE Introduction he night sky was charted by western civilization a few thou - N 1,370 deep sky objects and 360 double stars (two stars—one sands years ago to bring order to the random splatter of stars, often orbits the other) plotted with observing information for T and in the hopes, as a piece of the puzzle, to help “understand” every object. the forces of nature. The stars and their constellations were imbued with N Inclusion of many “famous” celestial objects, even though the beliefs of those times, which have become mythology. they are beyond the reach of a 6 to 8-inch diameter telescope. The oldest known celestial atlas is in the book, Almagest , by N Expanded glossary to define and/or explain terms and Claudius Ptolemy, a Greco-Egyptian with Roman citizenship who lived concepts. in Alexandria from 90 to 160 AD. The Almagest is the earliest surviving astronomical treatise—a 600-page tome. The star charts are in tabular N Black stars on a white background, a preferred format for star form, by constellation, and the locations of the stars are described by charts. -
SAA 100 Club
S.A.A. 100 Observing Club Raleigh Astronomy Club Version 1.2 07-AUG-2005 Introduction Welcome to the S.A.A. 100 Observing Club! This list started on the USENET newsgroup sci.astro.amateur when someone asked about everyone’s favorite, non-Messier objects for medium sized telescopes (8-12”). The members of the group nominated objects and voted for their favorites. The top 100 objects, by number of votes, were collected and ranked into a list that was published. This list is a good next step for someone who has observed all the objects on the Messier list. Since it includes objects in both the Northern and Southern Hemispheres (DEC +72 to -72), the award has two different levels to accommodate those observers who aren't able to travel. The first level, the Silver SAA 100 award requires 88 objects (all visible from North Carolina). The Gold SAA 100 Award requires all 100 objects to be observed. One further note, many of these objects are on other observing lists, especially Patrick Moore's Caldwell list. For convenience, there is a table mapping various SAA100 objects with their Caldwell counterparts. This will facilitate observers who are working or have worked on these lists of objects. We hope you enjoy looking at all the great objects recommended by other avid astronomers! Rules In order to earn the Silver certificate for the program, the applicant must meet the following qualifications: 1. Be a member in good standing of the Raleigh Astronomy Club. 2. Observe 80 Silver observations. 3. Record the time and date of each observation.