[vsnet-chat 5056] Variable stars in OGLE-II field

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Variable stars in OGLE-II field

    After checking some OGLE-II fields, I have noticed that a considerable
fraction of known GCVS/NSV variable stars in the OGLE-II fields has escaped
from detection.

One such example:

180317.2 -295928 (2000.0) SGRV1417 E/D: 16.23 16.6 B 32349.846 2.27 -

    is not recorded as a variable star candidate in OGLE-II.  This star
may be identified with either of the following BWC non-variable star.

180317.1 -295926 (2000.0) BWC28218 I=17.835 V-I=1.55
180317.1 -295927 (2000.0) BWC16773 I=17.253 V-I=1.87

    This finding may suggest either of them:

  1) Even OGLE-II is not far from complete in detecting variable stars.
     People have enough chance to discover new variable stars in the fields
     OGLE-II has already surveyed!

  2) GCVS contains a certain fraction of "non-variable" variable stars.

  3) The localizations of GCVS/NSV are far from complete even for
     well-determined (not "lost") objects.  [Regarding NSV stars, I mostly
     refer to the recent NSV Supplement].

  4) Other possibilities.

Regards,
Taichi Kato

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