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long period variable

Khi Cygni

Khi Cygni: Overshadowing the Bride

By Dr. Kristine Larsen, Central Connecticut State University

Alert Notice 358: Monitoring of Mira (omi Cet) in support of HST Observations

September 17, 2007: Dr. Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) and
collaborators are performing a comprehensive study of the Mira AB interacting system, using the WFPC2 camera on the Hubble Space Telescope. Mira AB is composed of the prototype Mira variable omi Cet and its companion VZ Cet, separated by about 0.5 arcsecond. As part of this project they plan to obtain a large number of high-angular resolution images at wavelengths ranging from UV to optical.  The main objectives of the HST/WFPC2 observations are:

AAVSO Bulletin 75 for 2012

Predicted Dates of Maxima and Minima of 381 Long Period Variables for 2012

Mira Variables with Period Changes

Mira variables are the longest-observed class of stars for which we have long-term quantitative data that allow us to study their behavior over centuries-long periods of time.  Fortunately for us, they're also easy to observe and monitor, having some of the largest amplitudes of all variables, and hundreds of them are bright enough that they're within reach of astronomers with modest telescopes.

AAVSO Bulletin Generator

The following form will allow you to generate a customized copy of the AAVSO Bulletin suited to your needs.  You may select stars from a given constellation, range of Right Ascension and/or Declination, or simply type in a list of stars you would like returned.  You may also customize the page that's output by color-coding the months depending upon the brightness of the star, and also limit output to a single month.  Leaving all options blank will give you the complete list of stars in this issue of the Bulletin with no color added to the table.

AAVSO Bulletin 74 for 2011

Predicted Dates of Maxima and Minima of 381 Long Period Variables for 2011

AAVSO Bulletin 73 for 2010

Bulletin 73 for 2010

Predicted Dates of Maxima and Minima of Long Period Variables for 2010

 

AAVSO Bulletin 73 for 2010 - Stars in Need of Observations

                        STARS IN NEED OF OBSERVATIONS
                                      in 
    AAVSO BULLETIN 73:  Predicted Maxima and Minima of Long Period Variables for 2010

The stars listed below need additional observations. Please be aware that many of these 
stars are difficult to observe, and should be observed only by experienced observers. 
Please note that the symbol % after a star name indicates the star has fair to excellent 
CCDV or multicolor photometry but still needs visual observations. Because all of the 

AAVSO Bulletin 73 for 2010 - How to Use the Bulletin

  How to Use Bulletin 73

IMPORTANT NOTICE:

Bulletin 73 was NOT prepared in the same way as in the past. Please be sure to READ THE INTRODUCTION before you use the Bulletin; contact AAVSO Headquarters if you have questions.

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