Special Notice #220: Request for observations of high-mass X-ray binaries (HMXBs) in support of radial velocity observations

HMXB campaign extended until further notice.  -  Elizabeth O. Waagen, 17 April 2020

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.

The master list of targets (J2000.0) is:

1H 1936+541      19:32:52.3  +53:52:45.5  [1936+541] [BD+53 2262]
RX J2030.5+4751  20:30:30.9  +47:51:50.7  [J2030.5+4751] [J2030.5+47]
V2175 Cyg        22:01:38.2  +50:10:04.6
V1008 Cep        22:07:57.1  +54:31:05.8  [4U 2206+543]
V831 Cas         01:47:00.2  +61:21:23.7
RX J0440.9+4431  04:40:59.3  +44:31:49.3  [LS V +44 17]
V420 Aur         05:22:35.2  +37:40:33.6
HD 249179        05:55:55.1  +28:47:06.4
SAX J0635+0533   06:35:18.3  +05:33:06.3  [EM* GGA 401]

October 20, 2010: Dr. Gordon Sarty, University of Saskatchewan, Canada, requests our continuing assistance (see AAVSO Alert Notices 348, 354, 377, Special Notices 118, 129, 143, 213) 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 the end of the year. The actual scheduled observing times are 2010 October 20 - 24, November 15-18, and December 19-23 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
J0440.9+44   04:40:59.3  +44:31:49.3 10.8  034    000-BCZ-082
V420 Aur       05:22:35.2  +37:40:33.6   7.7  040    000-BCT-897
HD 249179    05:55:55.1  +28:47:06.4   9.2  057    000-BCZ-340
J0635+0533  06:35:18.3  +05:33:06.3 12.8  058    000-BCZ-435

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


Charts may be downloaded at:


Please submit your observations directly to the AAVSO International Database, and thanks once again for your ongoing coverage of the HMXBs. This campaign is referenced on the AAVSO Observing Campaigns page.

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

This Special Notice was issued by Elizabeth O. Waagen.


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