Special Notice #143: Request extended to observe High-Mass X-Ray Binaries (HMXBs) in support of radial velocity observations

HMXB campaign extended until further notice. It has been updated numerous times and covered in AAVSO Alert Notices 348, 354, and 377, and in AAVSO Special Notices #118, #129, #143, #213, and #220.

AAVSO Special Notice #143

Request extended to observe High-Mass X-Ray Binaries (HMXBs) in support of radial velocity observations
January 10, 2009

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

"Please obtain BVRI photometry (or any subset thereof, VI preferred) of the following three HMXBs

Desig.   Name            R.A.(2000) Dec.(2000)  Mag  LPH no.  AUID
0434+41  RX J0440.9+4431 04:40:59.3 +44:31:49.3 10.8 034  000-BCZ-082 [LS V +44 17]
0515+37  V420 Aur        05:22:35.2 +37:40:33.6  7.5 040  000-BCT-897
0630+05B SAX J0635+0533  06:35:18.3 +05:33:06.3 12.8 058  000-BCZ-435

for the time period of our radial velocity observations from January 6 to January 18. The objective is to obtain simultaneous color photometry and radial velocity measurements of these three objects.

"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 three stars throughout the night. 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 http://www.aavso.org/publications/ejaavso/ej56.shtml

Charts may be downloaded at:

"As mentioned in the earlier Alert Notices, please follow the observing instructions given on the chart web page and on the charts and submit your results directly to the AAVSO International Database.

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

"Many thanks for your all of your past observations."

This AAVSO Special Notice was prepared by Dr. Gordon Sarty (submitted by Dr. Matthew Templeton)


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