Project VS-COMPAS
Variable Stars Common Observation
Mission in Particular Areas of the Sky
Variable Stars Common Observation
Mission in Particular Areas of the Sky
1347 stars discovered as of Nov 15, 2015
Free Bulletin on Variable Stars
ISSN 2309-5539 (online)
Published by The VS-COMPAS Project © 2011-2014
Hrodna, 230005, Belarus
Variable Stars Observer Bulletin is all about variable stars science. It's made by amateurs and for amateurs. Here simplified contemporary data about different aspects of variable stars research is published. The bulletin is scheduled for six issues per year.
January-February 2014 (#4)
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Contents
BL Lacertae objects - Blazars by Ivan Adamin
by Siarhey Hadon, Ivan Adamin
Front cover:BL Lacertae objects demonstrate the most violent behavior known among active galactic nuclei (AGN). These objects are mostly notable for being strongly and rapidly variable at all wavelengths, displaying substantial variations in brightness over a short period of time. Their properties also include high optical polarization and the lack of optical emission lines. They are named after the prototype object BL Lacertae, located in the constellation Lacerta (the Lizard), which was initially believed to be a variable star in our galaxy.
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VV Cephei: an extraordinary binary system by Ivan Adamin
VV Cephei eclipsing binary systems offer the most detailed method of studying mass loss from cool supergiant stars. The long-period of VV Cephei gives it a unique place among eclipsing binaries, but 20.4 years between eclipses make it really hard for scientists to study the system. Such a long interval gives only a couple of eclipse events in a working astronomical career for a human. Similar binaries are always good targets to follow, as the opportunity to obtain quality photometry and spectrometry of the eclipse is quite rare, but rewarding.
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Pulsating variable stars and the Hertzsprung-Russell diagram by Siarhey Hadon, Ivan Adamin
Studying intrinsically pulsating variable stars plays a very important role in stellar evolution under-standing. The Hertzsprung-Russell diagram is a powerful tool to track which stage of stellar life is represen-ted by a particular type of variable stars. Let's see what major pulsating variable star types are and learn about their place on the H-R diagram. This approach is very useful, as it also allows to make a decision about a variability type of a star for which the properties are known partially.
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Stellar spectral classification: a brief story of early steps by Ivan Adamin
In the early XX century, astronomers began photographing the spectra of stars, but the diversity of spectral
features was too confusing and complex to explain. Edward Pickering (1846-1919) re-arranged the spectral sequence, taking into consideration the changes in other lines. Building upon this idea, a team of astronomers at the Harvard Observatory, led by Annie Cannon (1863-1941), grouped similar appearing spectra together, designated by letters: A, B, C, etc. They also started a project on spectra classification. Soon, a smooth sequence of spectral types was found, and the assigned letters combined into O-B-A-F-G-K-M.
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Stellar associations: a variable stars nursery by Valery Tsehmeystrenko
The study of stellar associations and star formation regions is an important activity in the research of stars evolution and their systems. Stellar associations are concentrated along the spiral arms of our galaxy and come in several types. As a place where stars are born, these regions contain different kinds of objects, including variable stars, at the early stages of their life.
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Discovery of a Second Radial Mode in the High Amplitude Delta Scuti Star NSVS 10590484 (GSC 01489-00914) by Klaus Bernhard, Stefan Hümmerich
During an investigation of the pulsational behaviour of Delta Scuti stars, we have identified a second radial mode in the High Amplitude Delta Scuti star NSVS 10590484 (GSC 01489-00914) which was discovered by Alexandr Ditkovsky of the VS-COMPAS team. Therefore, NSVS 10590484 is an HADS(B) star with the following elements:
P0= 0.0541911 d; P1= 0.0419105 d (P1/P0= 0.7734).
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Notable long-period eclipsing binaries. Part I. by Ivan Adamin
Long-period eclipsing binary stars are very important for stellar astrophysicists, because they offer the chance to study the characteristics of isolated stars with a high degree of precision and accuracy. The most interesting fact about eclipsing binaries is that all kinds of stars are found as members of binaries: from normal main sequence stars, variable stars, evolved giants and supergiants, to collap-sed objects. Here a list of several interesting long-periodic systems is presented.
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Eclipsing variable TX UMa: my observations by Andrey Semenyuta
TX UMa is an eclipsing binary system. This article presents a summary of my visual observations, made from the city of Pavlodar, Kazakhstan. The measurements were made time-to-time throughout several years, so the task was mostly an interesting challenge and eye training at the same time. The result has a good match with the known period.
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The Constellation of Orion, Sirius and Jupiter
Sudak, Crimea (September 2012)
Image courtesy of Yuri Goryachko (2012)
www.astronominsk.org - high-quality astrophotography: sky panoramas, planets, deep-sky objects, the photographic atlas of the constellations, ISS
Sudak, Crimea (September 2012)
Image courtesy of Yuri Goryachko (2012)
www.astronominsk.org - high-quality astrophotography: sky panoramas, planets, deep-sky objects, the photographic atlas of the constellations, ISS
Want to contribute an article? Feel free to contact us at:
http://www.vs-compas.belastro.net/bulletin-contribute
or please simply drop an email to [ivan dot adamin at gmail dot com]
Issue #5
March-April 2014
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Amateurs' Guide to Variable Stars
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March-April 2014
Free Online
PDF Bulletin on Variable Stars
Amateurs' Guide to Variable Stars
Read Online as e-Magazine
In this issue:
KOI-3278: A self-lensing binary star system by Ivan Adamin
BL Bootis stars - anomalous Cepheids by Ivan Adamin
A revision of NSV 13538 = NSVS 17231162 by Alexandr Ditkovsky
NSVS 11075037 = Dauban V53:
updated elements of a Mira variable in Hercules by Siarhey Hadon
Pulsating variable stars and the Hertzsprung-Russell diagram
by Siarhey Hadon, Ivan Adamin
RS Puppis: the light echoes calibrate standard candles for accurate distance measurements
by Ivan Adamin
SS Lacertae: The non-eclipsing eclipsing binary by Ivan Adamin
>>View Full Contents
BL Bootis stars - anomalous Cepheids by Ivan Adamin
A revision of NSV 13538 = NSVS 17231162 by Alexandr Ditkovsky
NSVS 11075037 = Dauban V53:
updated elements of a Mira variable in Hercules by Siarhey Hadon
Pulsating variable stars and the Hertzsprung-Russell diagram
by Siarhey Hadon, Ivan Adamin
RS Puppis: the light echoes calibrate standard candles for accurate distance measurements
by Ivan Adamin
SS Lacertae: The non-eclipsing eclipsing binary by Ivan Adamin
>>View Full Contents
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