Skip to main content

Web Publications

AAVSO Special Notice #186: Request for observations of high-mass X-ray binaries AAVSO HOME > publications > special notice

AAVSO Special Notice #186

Request for observations of high-mass X-ray binaries
January 4, 2010

Dr. Gordon Sarty, University of Saskatchewan, Canada, requests our
continuing assistance in his ongoing radial velocity observations of
High Mass X-ray Binaries (HMXBs).  See AAVSO Special Notice 175 for
prior requests and project information. The targets for the current
observing run are the same as those listed in Special Notice 175.  Dr.
Sarty provides the following text for the current request:

"Please obtain BVRI photometry (or any subset thereof, VI preferred) of
the following six HMXBs for the time period of our radial velocity
observations from January 4 to January 31. The actual scheduled
observing times are January 4-7 and January 22-31 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 observing campaign are:

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

2157+49  V2175 Cyg   22:01:38.2  +50:10:04.6  8.8  127    000-BFS-469
2204+54  2206+543    22:07:56.2  +54:31:06.4  9.9  128    000-BDC-531
0140+60B V831 Cas    01:47:00.2  +61:21:23.7  11.3 029    000-BCY-758
0434+41  RXJ0440.9+  04:40:59.3  +44:31:49.3  10.8 034    000-BCZ-082
0515+37  V420 Aur    05:22:35.2  +37:40:33.6  7.5  040    000-BCT-897
0630+05B SAXJ0635+0  06:35:18.3  +05:33:06.3  12.8 058    000-BCZ-435

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 a different subset of
the six stars throughout each night. The observer will be Dave Balam,
who can be reached by e-mail to 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 with project specific information 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