[vsnet-const 19] RE: d Ser

[Sebasti若n Otero <varsao@fullzero.com.ar>]

I've observed this star a couple of times on 1999 and it was in fact at 5.2.
But it's interesting to know that in previous GCVS editions, as reflected in
Sky Catlogue 2000.0 vol.2, 1985 (Sinnott & Hirshfeld), the star was given a
range of  4.9 - 5.9 (!!!)  This reminds me the case of V449 Sco. It seems
that in past years doubtful measurements were taken directly into GCVS
pages.

Photometric data taken from the GCPD
 http://obswww.unige.ch/gcpd/cgi-bin/photoSys.cgi )
shows seven measurements of the AB pair between V 5.18 and 5.23.  Individual
measurements are;
A= V 5.36, B-V 0.52 and  B= V 7.51, B-V 0.23.

Best regards,
Sebasti睹.



----- Original Message -----
From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
To: <vsnet-const@kusastro.kyoto-u.ac.jp>
Sent: Monday, July 17, 2000 10:21 AM
Subject: [vsnet-const 18] d Ser


> d Ser
>
>    This star has been long known by binocular observers, but the nature
seems
> to be little known.  Although GCVS lists it as I: star with a range of
> 5.17-5.29 V, Hipparcos does not seem to record variability.
>    Is this a genuine constant star?  Or has it stopped variability?
>
>    The spectral type in GCVS is G0III+A6V.  According to Buscombe's
catalog,
> the spectrum is A0IV+G0III or G4(II)+B9.5V:
>
> Regards,
> Taichi Kato
>

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