[vsnet-chat 2638] (fwd) HW Tau ... (Thorstensen)

[Taichi Kato <tkato>]

Date: Thu, 3 Feb 2000 13:25:48 -0500 (EST)
From: "John R. Thorstensen" <thorsten@partita.dartmouth.edu>
Subject: HW Tau ...

For the record, I took some relatively short-exposure images
of HW Tau in October of 1999, using the 2.4m MDM telescope, in 
U, B, V, and I; these reached to about V = 20 with reasonable
photometric accuracy (+- 0.1 mag or so).  Nothing of unusual
color turned up, and in particular I measured the star marked 
in the Downes, Shara, and Webbink atlas at V = 18.34, B - V 
= 1.34, U - B = 0.72 +- 0.16, and V - I = 1.63.  These magnitudes
are unlikely to be very accurate (there's only one exposure
in each filter, the conditions were a little iffy, and the
calibration in U-B especially is not as good as one would like),
but they aren't typical of CVs.  The star marked in 
Downes, Shara, and Webbink does have a much fainter companion
about 3.1 arcsec to the NE, which I did not measure, but this 
does not appear to have unusual colors when the pictures
are blinked.

>> I was primarily just hoping for HW Tau to go into outburst
>> before Bruce and I submitted our CV sequence paper.  If that
>> didn't happen, then I was planning on taking a deep BV set
>> to see if there was a faint blue star near the DWS star.
>> Archive plate material would be helpful, but perhaps not
>> absolutely necessary.
>
>    Archive plate material would be absolutely necessary, unless some
>other *very* convincing evidence exists.  If you may find a CV candidate
>in the field, it can be a new independent CV.  History has proven most of
>"recovered" CVs required archive plate searches or reliable biblographic
>materials.  Think of multiple proposed candidates of V529 Ori, based on
>deep imaging and spectroscopy.
>
>Regards,
>Taichi Kato

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