[Aavso-photometry] RE AN #348 Request to Observe HMXBs

[Michael Sallman]

I notice that the comp star "d" for 1930+53 (AAVSO 1936+541) is much 
redder than the target star:

	The Hipparcos and Tycho Catalogues (ESA 1997)
Star	RAJ2000		DEJ2000		Vmag	BTmag	VTmag	B-V
------	------------	------------	-----	------	------	------
Target	19 32 52.313	+53 52 45.40	10.60	10.375	10.568	-0.170
d	19 32 57.715	+53 53 38.57	10.24	11.987	10.398 	1.331
A	19 32 44.504	+53 49 39.42	9.68	9.707 	9.683 	0.019

	TASS Mark IV Photometric Survey of Northern Sky (Droege+, 2006)
Star	RAJ2000		DEJ2000		TASS4ID	Vmag	Imag	V-I
______	___________	____________	_______	______	______	______
Target	19 32 52.34	+53 52 46.1 	2668236 10.440 	10.359	0.081
d	19 32 57.72	+53 53 39.0 	2668242 10.343 	9.032 	1.311
A	19 32 44.52	+53 49 39.4 	2668229 9.680 	9.608	0.072

"A" is much closer in color to the target, though about a magnitude 
brighter.
Also the quoted magnitude for the target star (9.8) seems to be a little 
bright (unless it's a maximum, and not an average).

Mike SVI

Tim Crawford wrote:
> RE AN #348 – Request to Observe HMXB’s 
> 
> This presented as an April/May effort
> 
> In reading the referenced article:  “Finding Periods
> in High Mass X-Ray Binaries,” specifically pages 6 & 7
> (Observing Methods):
> 
> http://arxiv.org/abs/astro-ph/0702248
> 
> The request appears to be for “Continuous Coverage”
> similar to that of the SS Cyg campaign, if I am
> reading it correctly.
> 
> In addition the request is for BVRI observations.
> 
> If the above two criteria are in fact what is being
> requested of for the four targets presented I think it
> would be wise to have observers post to this list the
> following:
> 
> Subject Box: HMXB Obs
> 
> AAVSO Desig. #
> UT Start Obs Time
> Estimated Ending UT Time
> Filter(s) Using
> 
> So that other observers can best determine how to
> “maximize” their own contributions.
> 
> In as much as only one of the four targets has comps
> currently available it is suggested that we submit the
> differentials (mobj –mcheck) directly to Dr. Sarty.
> 
> I think that in the case of TS this could be “awkward”
> until comps are generated and would suggest only some
> mid point or single obs be reported directly, at this
> time….. But it’s not my decision; this one is up to
> the Dr. I will go with the flow and do what is
> requested.  
> 
> My initial 2 cents 
> 
> Ad Astra
> 
> Tim Crawford CTX
> Arch Cape Observatory
> 
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