[vsnet-campaign-be 206] Re: BU Tau brighter?

[DWest61506@aol.com]

In a message dated 12/28/2002 3:38:58 AM Central Standard Time, hec@sunstel.asu.cas.cz writes:


> Dear Colleagues,
>
>       I do not understand what you are reporting here. For at least three
> years BU Tau is in its undisturbed state with V=5.04 mag. according
> to our unpublished Hvar and SPM photometry.
>
>    Since BU Tau is an object with an inverse correlation between the
> brightness and emission strength according to my classification, it means
> that its envelope is currently weak and inactive. Only
> a   d e c r e a s e   in its brightness would mean that a new envelope is
> being built and be worse of an alert. The currect brightness corresponds
> roughly to the true brightness of the central star, unaffected by a
> contribution from an envelope.
>
> (For details of the correlation see, e.g., 
> Harmanec 1983 Hvar Obs. Bull. 7, 55 or my recent 
> Harmanec 2000 Alicante IAU Col. 175 review - both available from ADS.)
>
>   A pleasant and successful year 2003 to everybody!
>
>                  Best wishes,
>                                          Petr Harmanec


Petr:
My CCDV observation of BU Tau indicates that it is getting brighter than V=5.04. On 12/22/2002 01:52 UT I measured BU Tau at V=4.91 +/- 0.02.  The comparison star was HD 23873 (V=6.60 per SIMBAD) and the check star was HD 23886 (V=8.01 per SIMBAD).  My measurement of the check star was V=8.02.  According to my measurments, BU Tau is getting brighter!

Regards,
Doug West
http://hometown.aol.com/dwest61506/index.html