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AAVSO Special Notice #210: Request for observations of high-mass X-ray binaries AAVSO HOME > publications > special notice

AAVSO Special Notice #210

Request for observations of high-mass X-ray binaries
May 19, 2010

Dr. Gordon Sarty, University of Saskatchewan, Canada, requests our 
continuing assistance in his ongoing observations of High Mass X-ray 
Binaries (HMXBs). Dr. Sarty provides the following text for the current 

"Please obtain BVRI photometry (or any subset thereof, VI preferred) of 
the following four HMXBs for the time period of our radial velocity 
observations to be made with the 72-inch Plaskett telescope at the 
Dominion Astrophysical Observatory (DAO) from now until June 30. The 
actual scheduled observing times are May 21-27 and June 24-30 if you 
want to get observations that are simultaneous with ours. Simultaneous 
observations are very useful. All observations of the HMXBs at any time 
are valuable. The targets for this DAO observing campaign are:

Name         R.A.(2000) Dec.(2000)    Mag LPH no. AUID

1936+541     19:32:52.3  +53:52:45.5  9.8  115    000-BDC-070
J2030.5+47   20:30:30.9  +47:51:50.7  9.3  123    000-BDC-306
2202+501     22:01:38.2  +50:10:04.7  8.8  127    000-BFS-469
2206+543     22:07:56.2  +54:31:06.4  9.9  128    000-BDC-531

In addition, Spitzer space telescope observations of LSS 5039:

LSS 5039     18:26:15.1 -14:50:54.3  11.2  100    000-BDB-845

will be made on May 21, 2:30 UT, and June 6, 23:51 UT. The observations 
will be for a little over 2 hours each date. Observations of LSS 5039 
made before, during, and after the Spitzer observations in the Ic band 
will be useful. A look at the AAVSO light curves for LSS 5039 show it to 
be mostly constant but we suspect eclipse-like variations at random 
intervals based on one observation that needs confirmation.

The DAO is located in Victoria, B.C., Canada, and the observer will be 
Dave Balam. Interested AAVSO observers should concentrate on one star 
per night, all night, for as many nights as you can devote, while Dave 
is observing at DAO.

For more background information on the HMXB project, please see our 
JAAVSO preprint at

Charts may be downloaded at:

Please submit your observations directly to the AAVSO International 

Thanks for your ongoing coverage of the HMXBs.

Please direct any questions about this observing campaign to
Dr. Gordon Sarty at ."

This AAVSO Special Notice was issued by Elizabeth O. Waagen, AAVSO.


Information on submitting observations to the AAVSO may be found at:


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