A CCD Search for Variable Stars of Spectral Type B in the Northern Hemisphere Open Clusters
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Arxiv:2012.09981V1 [Astro-Ph.SR] 17 Dec 2020 2 O
Contrib. Astron. Obs. Skalnat´ePleso XX, 1 { 20, (2020) DOI: to be assigned later Flare stars in nearby Galactic open clusters based on TESS data Olga Maryeva1;2, Kamil Bicz3, Caiyun Xia4, Martina Baratella5, Patrik Cechvalaˇ 6 and Krisztian Vida7 1 Astronomical Institute of the Czech Academy of Sciences 251 65 Ondˇrejov,The Czech Republic(E-mail: [email protected]) 2 Lomonosov Moscow State University, Sternberg Astronomical Institute, Universitetsky pr. 13, 119234, Moscow, Russia 3 Astronomical Institute, University of Wroc law, Kopernika 11, 51-622 Wroc law, Poland 4 Department of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University, Kotl´aˇrsk´a2, 611 37 Brno, Czech Republic 5 Dipartimento di Fisica e Astronomia Galileo Galilei, Vicolo Osservatorio 3, 35122, Padova, Italy, (E-mail: [email protected]) 6 Department of Astronomy, Physics of the Earth and Meteorology, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Mlynsk´adolina F-2, 842 48 Bratislava, Slovakia 7 Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Mikl´os´ut15-17, Hungary Received: September ??, 2020; Accepted: ????????? ??, 2020 Abstract. The study is devoted to search for flare stars among confirmed members of Galactic open clusters using high-cadence photometry from TESS mission. We analyzed 957 high-cadence light curves of members from 136 open clusters. As a result, 56 flare stars were found, among them 8 hot B-A type ob- jects. Of all flares, 63 % were detected in sample of cool stars (Teff < 5000 K), and 29 % { in stars of spectral type G, while 23 % in K-type stars and ap- proximately 34% of all detected flares are in M-type stars. -
Optical/IR Studies of Be Stars in NGC 6834 with Emphasis on Two Specific
RAA 2014 Vol. 14 No. 9, 1173–1192 doi: 10.1088/1674–4527/14/9/008 Research in http://www.raa-journal.org http://www.iop.org/journals/raa Astronomy and Astrophysics Optical/IR studies of Be stars in NGC 6834 with emphasis on two specific stars Blesson Mathew1,4, Watson P. Varricatt2, Annapurni Subramaniam3, N. M. Ashok4 and D. P. K. Banerjee4 1 Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn VIC 3122, Australia; [email protected] 2 Joint Astronomy Centre, 660 N. Aohoku Pl., Hilo, HI 96720, USA 3 Indian Institute of Astrophysics, Bangalore - 560 034, India 4 Astronomy and Astrophysics Division, Physical Research Laboratory, Navrangapura, Ahmedabad - 380 009, Gujarat, India Received 2014 February 12; accepted 2014 March 24 Abstract We present optical and infrared photometric and spectroscopic studies of two Be stars in the 70–80-Myr-old open cluster NGC 6834. NGC 6834(1) has been reported as a binary from speckle interferometric studies whereas NGC 6834(2) may possibly be a γ Cas-like variable. Infrared photometry and spectroscopy from the United Kingdom Infrared Telescope (UKIRT), and optical data from various facil- ities are combined with archival data to understand the nature of these candidates. High signal-to-noise near-IR spectra obtained from UKIRT have enabled us to study the optical depth effects in the hydrogen emission lines of these stars. We have ex- plored the spectral classification scheme based on the intensity of emission lines in the H and K bands and contrasted it with the conventional classification based on the intensity of hydrogen and helium absorption lines. -
Astronomy 2008 Index
Astronomy Magazine Article Title Index 10 rising stars of astronomy, 8:60–8:63 1.5 million galaxies revealed, 3:41–3:43 185 million years before the dinosaurs’ demise, did an asteroid nearly end life on Earth?, 4:34–4:39 A Aligned aurorae, 8:27 All about the Veil Nebula, 6:56–6:61 Amateur astronomy’s greatest generation, 8:68–8:71 Amateurs see fireballs from U.S. satellite kill, 7:24 Another Earth, 6:13 Another super-Earth discovered, 9:21 Antares gang, The, 7:18 Antimatter traced, 5:23 Are big-planet systems uncommon?, 10:23 Are super-sized Earths the new frontier?, 11:26–11:31 Are these space rocks from Mercury?, 11:32–11:37 Are we done yet?, 4:14 Are we looking for life in the right places?, 7:28–7:33 Ask the aliens, 3:12 Asteroid sleuths find the dino killer, 1:20 Astro-humiliation, 10:14 Astroimaging over ancient Greece, 12:64–12:69 Astronaut rescue rocket revs up, 11:22 Astronomers spy a giant particle accelerator in the sky, 5:21 Astronomers unearth a star’s death secrets, 10:18 Astronomers witness alien star flip-out, 6:27 Astronomy magazine’s first 35 years, 8:supplement Astronomy’s guide to Go-to telescopes, 10:supplement Auroral storm trigger confirmed, 11:18 B Backstage at Astronomy, 8:76–8:82 Basking in the Sun, 5:16 Biggest planet’s 5 deepest mysteries, The, 1:38–1:43 Binary pulsar test affirms relativity, 10:21 Binocular Telescope snaps first image, 6:21 Black hole sets a record, 2:20 Black holes wind up galaxy arms, 9:19 Brightest starburst galaxy discovered, 12:23 C Calling all space probes, 10:64–10:65 Calling on Cassiopeia, 11:76 Canada to launch new asteroid hunter, 11:19 Canada’s handy robot, 1:24 Cannibal next door, The, 3:38 Capture images of our local star, 4:66–4:67 Cassini confirms Titan lakes, 12:27 Cassini scopes Saturn’s two-toned moon, 1:25 Cassini “tastes” Enceladus’ plumes, 7:26 Cepheus’ fall delights, 10:85 Choose the dome that’s right for you, 5:70–5:71 Clearing the air about seeing vs. -
LIST of PUBLICATIONS Aryabhatta Research Institute of Observational Sciences ARIES (An Autonomous Scientific Research Institute
LIST OF PUBLICATIONS Aryabhatta Research Institute of Observational Sciences ARIES (An Autonomous Scientific Research Institute of Department of Science and Technology, Govt. of India) Manora Peak, Naini Tal - 263 129, India (1955−2020) ABBREVIATIONS AA: Astronomy and Astrophysics AASS: Astronomy and Astrophysics Supplement Series ACTA: Acta Astronomica AJ: Astronomical Journal ANG: Annals de Geophysique Ap. J.: Astrophysical Journal ASP: Astronomical Society of Pacific ASR: Advances in Space Research ASS: Astrophysics and Space Science AE: Atmospheric Environment ASL: Atmospheric Science Letters BA: Baltic Astronomy BAC: Bulletin Astronomical Institute of Czechoslovakia BASI: Bulletin of the Astronomical Society of India BIVS: Bulletin of the Indian Vacuum Society BNIS: Bulletin of National Institute of Sciences CJAA: Chinese Journal of Astronomy and Astrophysics CS: Current Science EPS: Earth Planets Space GRL : Geophysical Research Letters IAU: International Astronomical Union IBVS: Information Bulletin on Variable Stars IJHS: Indian Journal of History of Science IJPAP: Indian Journal of Pure and Applied Physics IJRSP: Indian Journal of Radio and Space Physics INSA: Indian National Science Academy JAA: Journal of Astrophysics and Astronomy JAMC: Journal of Applied Meterology and Climatology JATP: Journal of Atmospheric and Terrestrial Physics JBAA: Journal of British Astronomical Association JCAP: Journal of Cosmology and Astroparticle Physics JESS : Jr. of Earth System Science JGR : Journal of Geophysical Research JIGR: Journal of Indian -
Mandm Direct Spreads
Touring the moonlit Spring Skies... Observations from Saturday 11th May 2019 8.30pm - 2.15am Equipment used: TEC 140, tracking Nova Hitch Alt-Az with slow-mo controls and encoders on a Berlebach Planet, iPad Air2 running SkySafari Pro 5, Nexus WiFi, 10 and 21mm Ethos, Baader BBHS diagonal, Lumicon 2” UHC and OIII filters in a True-Tech manual filter wheel. Mixed forecasts, Clear Outside suggesting 27% cloud around midnight, Xasteria saying clear, Clear Outside loaded from within Xasteria offering something in-between (how do you get that, hey!?) and Meteoblue forecasting clear skies from 11 but with poor ‘Index 2’ and Jet Stream readings.... Having neglected visual astronomy for many months (having spent my time finally getting the imaging gear to play ball), I spent forty odd minutes re-learning how to set everything back up - in fact, it be on offer with the moon in attendance... took longer than it does to wheel out the imaging gear. Times have changed, my usual (100% visual) observing buddy was having a go at imaging (spectroscopy), so I was on my own for this evening. It meant I’d have to keep my own notes for a change, but also allow me to go at my own pace as I reacquainted myself with the night sky. By 8.30 I was ready to go, clear skies, still a shade of blue with a half moon hanging over in the south western sky. Temperature rapidly dropping. 21mm eyepiece in place easily held the entire moon. Fantastic details, sharp, contrasty, zero colour.. -
На Правах Рукописи Удк 524.3, 524.4, 524.6 Глушкова Елена
МОСКОВСКИЙ ГОСУДАРСТВЕННЫЙ УНИВЕРСИТЕТ имени М.В. ЛОМОНОСОВА ГОСУДАРСТВЕННЫЙ АСТРОНОМИЧЕСКИЙ ИНСТИТУТ имени П.К. ШТЕРНБЕРГА На правах рукописи УДК 524.3, 524.4, 524.6 Глушкова Елена Вячеславовна КОМПЛЕКСНОЕ ИССЛЕДОВАНИЕ РАССЕЯННЫХ ЗВЁЗДНЫХ СКОПЛЕНИЙ ГАЛАКТИКИ Специальность 01.03.02 ± астрофизика и звёздная астрономия Диссертация на соискание ученой степени доктора физико-математических наук Москва ± 2014 1 Оглавление Введение ...................................................................................................................................................4 Глава 1. Собственные движения и лучевые скорости РЗС..................................................................19 1.1. Абсолютные собственные движения..........................................................................................19 1.1.1 Абсолютизация собственных движений звёзд в 21 рассеянном скоплении.....................20 1.1.2 Оценка ошибок каталога 4М...............................................................................................27 1.1.3 Оценка параметров кривой вращения по собственным движениям 21 РЗС....................28 1.1.4 Абсолютные собственные движения 181 молодого скопления.........................................28 1.1.5 Кривая вращения подсистемы молодых рассеянных скоплений......................................37 1.1.6 Каталог абсолютных собственных движений РЗС.............................................................38 1.1.7 Членство звёзд в скоплениях...............................................................................................39 -
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. -
SEPTEMBER 2019 President’S Corner SEPTEMBER 2019 Face of Jupiter Or Saturn Because They Have Welcome to the September No Tangible Surface
ReflectionsReflections Newsletter of the Popular Astronomy Club SEPTEMBER 2019 President’s Corner SEPTEMBER 2019 face of Jupiter or Saturn because they have Welcome to the September no tangible surface. Jupiter, Saturn, Uranus 2019 edition of “Reflections”, and Neptune are gas giants—they don’t have the universe’s best astronomy a hard surface upon which one can stand. But newsletter. I am always imagine we could! Ok. So assuming we amazed by the level of activi- could stand on the equator of all the planets in ties and enthusiasm for the our solar system (and the Moon), I made hobby our club members con- some quick calculations to estimate the speed tinue to demonstrate. You can read about these activities in you would have just passively standing there. this edition. This summer, we Below is a table of my calculations: have had a number of very Alan Sheidler successful public observing sessions, all of which are documented in this Diameter Rotation Equatorial newsletter. One of the aspects of public observ- Planet (mi) Period (hr) Speed (mph) ing sessions is the possibility to engage visitors, Mercury 3032 1407.6 6.8 not only to glimpse objects in the eyepiece of the 7523 -5832.5 telescope, but also to discuss some of the physi- Venus -4.1 cal attributes of those selfsame objects. During Earth 7928 23.9 1042 one of these sessions, I was involved in a discus- Moon 2160 655.7 10.3 sion about the planet Jupiter about how quickly 4221 24.6 the Red Spot rotates into and out of view as seen Mars 539 in the telescope. -
Binocular Universe: Summer’S Swan Song
Binocular Universe: Summer’s Swan Song September 2011 Phil Harrington s the haze and heat of summer slowly gives way this month to drier autumn nights, we find Cygnus, the Swan, flying high in the evening sky. Few Aconstellations offer such a diverse collection of binocular targets as Cygnus. We visited some in this column last October, and return again to continue that journey. Our jumping-off point this month is the Swan’s center star, Sadr, plotted as Gamma (γ) Cygni on most atlases. It’s from this central point that the Swan’s wings stretch away from its body, westward to Zeta (ζ) Cygni and eastward to Eta (η) Cygni. Above: Summer star map from Star Watch by Phil Harrington. Above: Finder chart for this month's Binocular Universe. Chart adapted from Touring the Universe through Binoculars Atlas (TUBA), www.philharrington.net/tuba.htm Back in 2003, I received an e-mail from Hope Douglas Harle-Mould of Kenmore, NY, describing several interesting asterisms that he had uncovered through his binoculars. His first is centered on Sadr and is christened the Amber Heart of Cygnus. He writes, "The central star in the Northern Cross, where the heart of Cygnus the Swan would be, is amber to my eye. With the naked eye it is solitary, but in binoculars you see it surrounded by a halo of dim stars. These stars form a distinctively heart shape, a little rounded off, but clearly a heart. What's more, the amber star is in the center of the top of the heart, like a jewel in a pendant." Even though the area is teeming with stars, the heart is clearly discernible through 7x to 10x binoculars. -
III. the S106 Molecular Cloud As Part of the Cygnus X Cloud Complex
A&A 474, 873–882 (2007) Astronomy DOI: 10.1051/0004-6361:20077540 & c ESO 2007 Astrophysics A multiwavelength study of the S106 region III. The S106 molecular cloud as part of the Cygnus X cloud complex N. Schneider1,4,R.Simon4, S. Bontemps2, F. Comerón3, and F. Motte1 1 DAPNIA/SAp CEA/DSM, Laboratoire AIM CNRS - Université Paris Diderot, 91191 Gif-sur-Yvette, France e-mail: [email protected] 2 OASU/LAB-UMR5804, CNRS, Université Bordeaux 1, 33270 Floirac, France 3 ESO, Karl-Schwarzschild Str. 2, 85748 Garching, Germany 4 I. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany Received 26 March 2007 / Accepted 15 August 2007 ABSTRACT Context. The distance to the wellknown bipolar nebula S106 and its associated molecular cloud is highly uncertain. Values between 0.5 and 2 kpc are given in the literature, favoring a view of S106 as an isolated object at a distance of 600 pc as part of the “Great Cygnus Rift”. However, there is evidence that S106 is physically associated with the Cygnus X complex at a distance of ∼1.7 kpc (Schneider et al. 2006, A&A, 458, 855). In this case, S106 is a more massive and more luminous star forming site than previously thought. Aims. We aim to understand the large-scale distribution of molecular gas in the S106 region, its possible association with other clouds in the Cygnus X south region, and the impact of UV radiation on the gas. This will constrain the distance to S106. Methods. We employ a part of an extended 13CO and C18O1→ 0 survey, performed with the FCRAO, and data from the MSX and Spitzer satellites to study the spatial distribution and correlation of molecular cloud/PDR interfaces in Cygnus X south. -
ASI 2018 Abstract Book
XXXVI Meeting of Astronomical Society of India Department of Astronomy, Osmania University, Hyderabad 5 – 9 February 2018 Abstract Book Table of Contents Title Page No. 6th February 2018 Special Lecture - Parameswaran Ajith - Einstein’s Messengers 1 Parallel Session – Stars, ISM and the Galaxy I 2 Lokesh Dewangan - Observational Signatures of Cloud-Cloud Collision in the 2 Galactic Star-Forming Regions (I) Manash Samal - Understanding star formation in filamentary clouds - a case 3 study on the G182.4+00.3 cloud Veena - Understanding the structure, evolution and kinematics of the IRDC 4 G333.73+0.37 Jessy Jose - The youngest free-floating planets: A transformative survey of 5 nearby star forming regions with the novel W-band filter at CFHT-WIRCam Mayank Narang - Are Exoplanet properties determined by the host star? 6 Parallel Session – Extragalactic Astronomy 1 7 Rupak Roy - The Nuclear-transients 7 Agniva Roychowdhury - Study of multi-band X-Ray Time Variability of Mrk 421 8 using ASTROSAT Brajesh Kumar - Long term optical monitoring of the transitional Type Ic/BL-Ic 9 supernova ASASSN-16fp (SN 2016coi) Prajval Shastri - Multi-wavelength Views of Accreting Supermassive Black Holes 9 using ASTROSAT Pranjupriya Goswami - X-ray spectral curvature of high energy blazars with 10 NuSTAR observations Bindu Rani - Wobbling jets in active super-massive black holes 10 Parallel Session – General Relativity and Cosmology I 11 Pravabati Chingangbam - Probing length and time scales of the EoR using 11 Minkowski Tensors (I) Akash Kumar Patwa - On detecting EoR using drift scan data from MWA 11 Table of Contents Shamik Ghosh - Current status of the radio dipole and its measurement 12 strategy with the SKA Debanjan Sarkar - Modelling redshift-space distortion (RSD) in the post- 13 reionization HI 21-cm power spectrum Dinesh Raut - Measuring the reionization 21cm fluctuations using clustering 14 wedges. -
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A&A 632, A95 (2019) Astronomy https://doi.org/10.1051/0004-6361/201936418 & c ESO 2019 Astrophysics Ensemble asteroseismology of pulsating B-type stars in NGC 6910? D. Mo´zdzierski1, A. Pigulski1, Z. Kołaczkowski1,2, G. Michalska1, G. Kopacki1, F. Carrier3, P. Walczak1, A. Narwid1, M. St˛eslicki´ 1,4, J.-N. Fu5, X.-J. Jiang6, Ch. Zhang5, J. Jackiewicz7, J. Telting8, T. Morel3,9, S. Saesen3,10, E. Zahajkiewicz1, P. Brus´1, P. Sródka´ 1, M. Vuckoviˇ c´3,11, T. Verhoelst3,12, V. Van Helshoecht3, K. Lefever3,12, C. Gielen3, L. Decin3, J. Vanautgaerden3, and C. Aerts3,13 1 Instytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, 51-622 Wrocław, Poland e-mail: [email protected] 2 Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warszawa, Poland 3 Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium 4 Space Research Centre, Polish Academy of Sciences, Kopernika 11, 51-622 Wrocław, Poland 5 Department of Astronomy, Beijing Normal University, 100875 Beijing, PR China 6 National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, 100012 Beijing, PR China 7 Department of Astronomy, New Mexico State University, Las Cruces, NM 88003, USA 8 Nordic Optical Telescope, Rambla José Ana Fernández Pérez 7, 38711 San Antonio, Breña Baja, Santa Cruz de Tenerife, Spain 9 Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Quartier Agora, Allée du 6 Août 19c, Bât. B5C, 4000 Liège, Belgium 10 Département