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observing

Variable stars with companions

In the April 2014 Newsletter we published an article on variable stars with close companion causing problems with their photometry.

In this page we give more information and updated tables so you can be aware of the stars that are causing problems or have caused problems in the past.

We will be updating this information with more stars in the future.
If you find a problem similar to those described in the Newsletter article, please let us know.

 

AAVSO Bulletin 77 for 2014 - Letter to Observers

Letter to Users of 2014 Bulletin

                                                                                                                                                        February 2014

Dear Observers,

AAVSO Bulletin 77 - Stars with Double Maxima

In AAVSO Bulletin 77 there are three stars that exhibit double maxima:  V Boo, R Cen, and R Nor. These stars therefore have primary and secondary maxima and minima. They are not included in the main Bulletin table. Their predicted dates of maximum and minimum for January 2014 through February 2015 are presented here in list form (JD and Gregorian calendar dates) and in approximation of the main Bulletin table format.

AAVSO Bulletin 76 - Stars with Double Maxima

In AAVSO Bulletin 76 there are three stars that exhibit double maxima:  V Boo, R Cen, and R Nor. These stars therefore have primary and secondary maxima and minima. They are not included in the main Bulletin table. Their predicted dates of maximum and minimum for January 2013 through February 2014 are presented here in list form (JD and Gregorian calendar dates) and in approximation of the main Bulletin table format.

AAVSO Bulletin 76 for 2013 - Letter to Observers

Letter to Users of 2013 Bulletin

                                                                                                                                                             February 2013

Dear Observers,

AAVSO Bulletin 75 for 2012 - Letter to Observers

Letter to Users of 2012 Bulletin and Some AAVSO Bulletin History

                                                                                                                                     February 2012

Dear Observers,

AAVSO Bulletin 75 - Stars with Double Maxima

In AAVSO Bulletin 75 there are two stars that exhibit double maxima:  R Cen and R Nor. These stars therefore have primary and secondary maxima and minima. They are not included in the main Bulletin table. Their predicted dates of maximum and minimum for January 2012 through February 2013 are presented here in list form (JD and Gregorian calendar dates) and in approximation of the main Bulletin table format.

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