[Aavso-photometry] HMXB Campaign Time - Lets Go Photon Hunting

[Keith Graham]

Hi Tim,

Nice to see another HMXB campaign. Can we be assurred this time that the 
comps are NOT VARIABLE :).

Cheers,

Keith


----- Original Message ----- 
From: "Tim Crawford" <tcarchcape at yahoo.com>
To: <aavso-photometry at mira.aavso.org>
Cc: "Gordon E. Sarty" <gordon.sarty at usask.ca>; "cosmos (Dave Balam)" 
<cosmos at uvic.ca>
Sent: Thursday, January 08, 2009 9:27 PM
Subject: [Aavso-photometry] HMXB Campaign Time - Lets Go Photon Hunting


> AAVSOvians& Photon Chasers,
>
> Dr. Gordon Sartyhas again been successful in securing some time on the 
> 1.84 meter PaskettTelescope, at the DAOin Victoria, to do spectroscopy on 
> three specific HMXBTargets, specificallyto compute radial velocity 
> measurements
>
> LPH0034, LPH040  LPH058:
>
> http://homepage.usask.ca/~ges125/AAVSO_HMXB_Charts.html
>
> David D. Balam, Dept. of Physics and Astronomy, University of Victoria, is 
> going to be operating the spectroscope through the night of January 18th.
>
> Dr. Sartyis very anxious to have long time series photometry on all of 
> these targets with LPH040 (V420 Aur-See Note at bottom) being the current 
> priority if you are only able to follow one. BVRIphotometry is even more 
> appreciated with V & I being the priority filters for long time series.
>
> Dave checked into the Chat line Thursday night to let us know he was open 
> and able to do spectroscopy.
>
> Here is the outside dome video cam link and also some information about 
> the DAO:
>
> http://www.hia-iha.nrc-cnrc.gc.ca/dao/skycam_e.html
>
> I hope that we can get a number of folks to help out so that they can get 
> some simultaneous photometry... and by the way.... photometry is to be 
> appreciated long after the 18th.... lots of nights are needed to help, 
> among other issues, with establishing periods.
>
> NOTE RE LPH040:
>
> With these particular targets Good SN numbers are very much necessary. 
> LPH040 (V420 AUR) presents a special challenge in as much as the Target ~ 
> 7.5 mag while the comps are in the ~12 mag range.  The only way to get 
> good SN numbers without overexposing the target is to do an ensemble:
>
> Lionel Catalan, who will be zero pointing multiple observers observations 
> of this target has requested that if we do an ensemble that the CMAG 
> (AAVSO Extended Format) be the average IM magnitude of the ensemble and 
> that the KMAG be the IM of a check star that is not part of the ensemble 
> and is close in color to the target.
> In my particular case, I have chosen to use f,j,k&g as the comp stars for 
> a 4 star ensemble and the h star as the check star (as within my fov this 
> star best matches the color of the target).
>
> For HMXBbackground check out this eJAAVSOpdf
> http://www.aavso.org/publications/ejaavso/ej56.shtml
> Please help out if you are able to and know that your efforts will 
> appreciated by a lot of folks involved in this endeavor.
> Happy New Year and ad Astra
>
> Tim Crawford CTX
> Arch Cape Observatory
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