[vsnet-chat 4345] Re: V1436 Aql

["Ondrej Pejcha" <opejcha@volny.cz>]

John Greaves wrote:
> I doubt that this nearby red dwarf is an eclipsing binary.

As it is obvious from Tycho 2 photometry, V1436 Aql is
invariable (or at least 1.2923 d period resulted into
scatter).

I would like to point out V374 And. As I remember, it is
also red dwarf and the E type variability came from three or
four faint Hipparcos photometry magnitudes. I think that it
was originally classified as SR in Hipparcos Annex C. Is
anything further known about this star (period etc.)?

Have a look on Hipparcos light curve of V627 Cas (=HIP
113373), symbiotic binary which is also very red (B-V=2.7
mag) and faint (nearly 13 mag in V). It shows some
variability roughly consistent with published period.
However, could the variability be due to ageing effects of
Hipparcos' detectors?

Despite the fact that many Hipparcos variables turned out to
be really eclipsing binaries (EF Boo, CD Lyn), some of them
didn't (probably V1436 Aql - does anyone know further
examples?). I wonder how many such stars are included in
GCVS. Will the GCVS team wait for accurate PEP for each
individual object and then assign CST type of variability in
the next edition of GCVS?

Best regards,

Ondrej Pejcha

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