Special Notice #180: Request for observations of V420 Aur in support of Spitzer Space Telescope observations

AAVSO Special Notice #180

Request for observations of V420 Aur in support of Spitzer Space Telescope observations
November 23, 2009

Dr. Gordon Sarty, University of Saskatchewan, requests special assistance with his ongoing project to observe high mass X-ray binaries (HMXBs).  See AAVSO Alert Notice 377 and Special Notice 175 for more information on the current project.  Dr. Sarty provides the following text for the current request:

"On November 29, 2009 from 18:40 to 22:35 UT the Spitzer IRAC instrument will observe the HMXB V420 Aur in an effort to observe clumpy circumstellar material pass behind the high mass B[e] star. This is the first of four 4 hour Spitzer observations of HMXBs planned. Continuous time-series observations in one filter that are simultaneous with the Spitzer observations will be the most valuable. The filters to use, in order of preference, are: V, I, R, B. Please contact [Dr. Sarty] at gordon.sarty@usask.ca to coordinate which filter to use with other observers. The target V420 Aur is:

Desig.   Name         R.A.(2000) Dec.(2000)  Mag  LPH no.  AUID
0515+37  V420 Aur    05:22:35.2  +37:40:33.6  7.5  040    000-BCT-897

A project specific chart is available at: http://homepage.usask.ca/~ges125/Astronomy/LPH040_aavso.pdf

A brief abstract of the proposed Spitzer observations may be found at: http://adsabs.harvard.edu/abs/2009sptz.prop60055S

and an overview of the HMXB project may be found in the JAAVSO article at: http://www.aavso.org/publications/ejaavso/v35n2/327.shtml

Please submit your observations directly to the AAVSO International Database.

Thanks for your ongoing coverage of the HMXBs."

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


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