Skip to main content

Web Publications

AAVSO Special Notice #163: Request for observations of high-mass X-ray binaries AAVSO HOME > publications > special notice

AAVSO Special Notice #163

Request for observations of high-mass X-ray binaries
July 29, 2009

Dr. Gordon Sarty, University of Saskatchewan, Canada, has requested our 
continuing assistance (see AAVSO Alert Notices 348, 354, 377, special 
notices 118, 129, 143, 159) in his ongoing radial velocity observations of 
High Mass X-ray Binaries (HMXBs). The following text was provided by Dr. 

"Please obtain BVRI photometry (or any subset thereof, VI preferred) of 
the following four HMXBs for the time period of our radial velocity 
observations from July 31 to August 11. The objective, as with previous 
requests, is to obtain simultaneous color photometry and radial velocity 
measurements of these four objects.

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

1930+53 1936+541        19:32:52.3  +53:52:45.5  9.8  115    000-BDC-070
2027+47 J2030.5+47      20:30:30.9  +47:51:50.7  9.3  123    000-BDC-306
2157+49 2202+501        22:01:38.2  +50:10:04.6  8.8  127    000-BFS-469
2204+54 2206+543        22:07:57.1  +54:31:05.8  9.9  128    000-BDC-531

[Note: when generating charts or looking up these objects with VSX,
please use the coordinates or the AUID.]

Our radial velocity measurements will be done with the Dominion 
Astrophysical Observatory (DAO) 1.85-m Plaskett telescope, in Victoria, 
B.C., Canada. We will alternate observations of the four stars throughout 
the night. The observer will be Neil Johnson, who can be reached on the 
AAVSO chat-line during the observations. Interested AAVSO observers should 
concentrate on one star per night, all night, for as many nights as you 
can devote, while we are observing.

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 ."


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


A Special Notice archive is available at the following URL:

Subscribing and Unsubscribing may be done at the following URL:

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484