GSC 02757-00769 IS A NEW BINARY SYSTEM
Maciejewski, G., Karska, A., Niedzielski, A.
January 6, 2003
The star
GSC 02757-00769
was found to be a new variable of the W Ursae Majoris type.
243 individual photometric measurements were collected
during 18 nights between September and December 2002.
At the maximum light GSC 02757-00769 reaches mV=10.50 mag and varies in
brightness with an amplitude of 0.24 mag. The secondary minimum
seems to be shallower and the maximum following the primary minimum is noticeably
fainter. The magnitudes were determined with the differential aperture
photometry against comparison stars for which V magnitudes were calculated from
TYCHO-2 Catalogue.
|
|
The period search was performed with the
ANOVA method of Schwarzenberg-Czerny. The time of a primary
minimum was computed with the Kwee-van Woerden method. A preliminary ephemeris is following:
Min.I = HJD 2452555.49881(23) + 0.d419195(31) x E.
Practically all W UMa stars in the Solar neighborhood are identified as X-ray
emitters. It is also the case of GSC
02757-00769. In the angular distance of 8 arcsec from this object there is an
X-ray source
1RXS J225630.4+335507.
We suggest that GSC 02757-00769 and 1RXS
J225630.4+335507 are in fact the same object. Due to positions coincidence we
also identify GSC 02757-00769 with the IR source observed within 2MASS survey -
2MASS J2256308+335512.
The results were published in IBVS 5370 (compressed PostScript).
|
