IGO Publications

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    Photometric study ofWUMa type binaries in the intermediate open cluster NGC 7789
    (Research in Astron. Astrophys., 2010-04-25) Kandulapati, Sriram; Pasagada, Vivekananda Rao
    The light curve solutions of twoWUMa binary systems in the intermediate open cluster NGC 7789 are presented in this paper. These variables were observed using the 2m telescope of the IUCAA-Girawali Observatory. The V passband photometric solutions of the two W UMa binaries were obtained using the latest version of theW–D program. The result shows that both systems are H-subtypeWUMa binaries with high mass ratios.
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    A CCD photometric study of the newly discovered contact binary ASAS 134738+0410.1
    (Bull. Astr. Soc. India, 2010-05-21) Deb, Sukanta; Singh, Harinder P.; Seshadri, T. R
    We present a CCD photometric study of the star with ASAS ID 134738+0410.1 using V band observations obtained from the IUCAA Girawali Observatory (IGO) 2-metre telescope, India. The star was selected from the Scuti database of All Sky Automated Survey (ASAS) (Pojmanski 2002). Our analysis reveals that the star is not a Scuti variable but is in fact a W UMa type contact binary with an orbital period of 0.2853067 day. Two new times of primary and secondary minima were determined from the observed data. A preliminary solution obtained using the Wilson-Devinney light curve modelling technique indicates that the star is more likely a partially-eclipsingWUMa type contact binary. However, the determination of actual subtype of this binary is quite impossible from the photometry alone, as the observed light curve can fitted for both A- and W-type solutions. The exact classification of this binary needs to be determined from high resolution spectroscopy.