Abstract
This paper reports the first spectroscopic observations in the Hα region at different orbital phases and the revised photometric solutions, for the contact binary KP101231 (V1) in the direction of the open cluster Praesepe. The photometric solutions obtained for the data in V and R passbands using the Wilson–Devinney (WD) method suggest that both components were in good thermal contact. The equivalent widths (EW) of Hα and Na lines were studied at various phases and a filled-in absorption profile around phase 0.58–0.68 was observed and compared with other phases. A correlation was observed between the profiles of Hα and Na lines at various phases.
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IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy(AURA) under cooperative agreement with the National Science Foundation.
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Acknowledgements
The authors would like to acknowledge the Director of IUCAA, Pune and the Director of IIA, Bengaluru for allocating time for the observations at IGO and VBO respectively. The authors also sincerely thank Dr. Sara Gettel and Dr. Joshua Pepper for their help in providing the data. The second author (RJ) acknowledges the financial support from the project UGC-BSR Research Start-Up Grant sanctioned vide UGC Order No. F. 30-108/2015(BSR) of UGC, under which part of the work has been carried out.
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An erratum to this article is available at http://dx.doi.org/10.1007/s12036-016-9418-5.
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Devarapalli, S.P., Jagirdar, R. First Hα and Revised Photometric Studies of Contact Binary KP101231. J Astrophys Astron 37, 18 (2016). https://doi.org/10.1007/s12036-016-9394-9
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DOI: https://doi.org/10.1007/s12036-016-9394-9