Login Get Account Search [?]

Variable Stars Common Observation
Mission in Particular Areas of the Sky

1347 stars discovered as of Nov 15, 2015
News Discoveries Search Bulletin Observing Articles Classification References Tools Team

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.

July-August 2013 (#1)

Suitable for reading on PC or tablet:

Download PDF A4 (1.2 MB)

Printable Brochure Layout version:

Download PDF A5 (1.2 MB)

Download PDF A5 Cover (1.5 MB)

See how to print a brochure here


NSVS 15314262 - A new ACV variable by Ivan Adamin
A new fairly bright ACV variable star has been discovered by Alexandr Ditkovsky recently. With the median nearly 10.42m, it is the sixth-brightest ACV variable in the constellation of Canis Major. Read more >>
Six new close binary systems with O'Connell effect by Ivan Adamin
As part of the VS-COMPAS research program, here are six new objects proposed for which the presence of O'Connell effect in the light curve is clearly noted. All of them are short-periodic close binaries of EW type, except one: NSVS 3878776 is an interesting Beta Lyrae-like system. Read more >>
Elements for two T Tauri variables in Taurus by Ivan Adamin
There are two T Tauri-alike variable sources were discovered in the constellation of Taurus by the VS-COMPAS team. Elements are refined. Read more >>
NSV 13636 Classification Revised by Ivan Adamin
Being initially referenced by C.Hoffmeister as S 10089 Cyg, a long-periodic suspect, the NSV 13636 was finally resolved to SRA variable with period of 168.5 days. Read more >>
HST Reveals Debris Disk Around T Pyxidis by Ivan Adamin
T Pyx is a recurrent nova, erupting every 12 to 50 years and ejecting material that has formed the disk around the bright star. Hubble Space Telescope photographed T Pyx's latest outburst in April 2011, giving a rare look at stellar eruption in details. Read more >>
Expanding the list of W Virginis variable stars by Ivan Adamin
As of August 2013, the VSX database contains 252 records of CWA variables with only 32 of them known in the Northern hemisphere. Here are two new CWA stars are presented, discovered by the VS-COMPAS team members: NSVS 13622006 and 2MASS J18144389+5531238. Read more >>
Bright and interesting Cepheids by Ivan Adamin
Cepheids are yellow supergiant pulsating variable stars, which are probably the best-known and important of all pulsating variables. Generally, Cepheids have large amplitudes, making it possible to find them even in distant galaxies. The reason Cepheids change their brightness is believed due to pulsations mechanizm. Read more >>
What are the R Coronae Borealis stars? by Ivan Adamin
The RCB stars are interesting and important as they represent a short-lived stage of stellar evolution and reveal some detail on dust formation processes. Thus, R Coronae Borealis and other RCB stars are quite unusual and worthy of much attention. Since the Pigott's first observation, only about 100 RCB variables have been discovered, making this class a very rare kind of variable stars. Read more >>
Six new RR Lyrae stars with Blazhko effect by Ivan Adamin
As part of VS-COMPAS data-mining program, here are six new pulsating RR Lyrae variables with the presence of the Blazhko effect listed. The research result on these objects is submitted to the VSX catalog for the first time by the VS-COMPAS team members. Photometric data from publicly available surveys (NSVS, CRTS, ASAS) was used a a source for light curves. Read more >>
The Blazhko Effect mystery by Ivan Adamin
The Blazhko effect is a long-term, irregular modulation of the amplitude and period that occurs in some RR Lyrae stars and related pulsating variables The physical origin of the effect remains unknown for over a century. Read more >>
Public Photometry Banks as a Source for Data Mining by Ivan Adamin
Photometric surveys are essential for variable stars science. Nowadays an individual may access publicly available photometry sources for a research instead of maintaining own one. Surveys usually cover a significant area of the sky with millions of light measurements. This provides some advantages and allows a "fast start" though an user is restricted to only a data gathered during a pre-defined period in the past. Read more >>

Front cover:
Lake Strusta illuminated by the rising Moon
Braslau Lakes National Park, Belarus
Image courtesy of Viktar Malyshchyts © 2012

You are welcome to check out Viktar's time-lapse video Belarus: in Embrace of Stars

Want to contribute an article? Feel free to contact us at:

or please simply drop an email to [ivan dot adamin at gmail dot com]

Selected Issue (#5)

Issue #5
March-April 2014

Free Online
PDF Bulletin on Variable Stars

Amateurs' Guide to Variable Stars

Download Free PDF

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
Statistics Overview

Variables by Constellation
Variables by Type
Variables by Magnitude
Variables by Period

Build Own Criteria
Variable Stars Observer Bulletin

Project VS-COMPAS © 2011-2014
Hosted by: hoster.by