AAVSO Special Notice #213

Request for observations of high-mass X-ray binaries

July 30, 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 request:

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 August 29. The actual scheduled observing
times are July 29 - August 2 and August 25-29 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
0140+60B     01:47:00.2  +61:21:23.7 11.3  029    000-BCY-758

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 article at

http://adsabs.harvard.edu/abs/2007JAVSO..35..327S [1]

Charts may be downloaded at:

http://homepage.usask.ca/~ges125/Astronomy/LPH115_aavso.pdf [2]
http://homepage.usask.ca/~ges125/Astronomy/LPH123_aavso.pdf [3]
http://homepage.usask.ca/~ges125/Astronomy/LPH127_aavso.pdf [4]
http://homepage.usask.ca/~ges125/Astronomy/LPH128_aavso.pdf [5]
http://homepage.usask.ca/~ges125/Astronomy/LPH029_aavso.pdf [6]


Please submit your observations [7] directly to the AAVSO International
Database and thanks once again for your ongoing coverage of the
HMXBs.

Please direct any questions about this observing campaign to
Dr. Gordon Sarty at gordon.sarty@usask.ca [8] .


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