CAOSP abstracts, Volume: 50, No.: 2, year: 2020

Author(s): Rukmini, J.; Shanti Priya, D.; Jishnu, P.; Vinay Kumar, G.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 50, no. 2, p. 627-629.
Date: 3/2020
Title: A comprehensive study of the sdB+dM binary TYC 3315-1807-1
Keyword(s): binaries: subdwarfs, binaries: period variation, stars: spectroscopy: Balmer lines, stars: spectroscopy: equivalent widths
Pages: 627 -- 629
DOI: https://doi.org/10.31577/caosp.2020.50.2.627
NASA ADS Abstract Service: 2020CoSka..50..627R
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: TYC 3315-1807-1 is an sdB+dM binary first reported by Kawka et al. (2010). Archival photometric data indicate the presence of a secondary companion causing a large reflection effect. Spectroscopic observations of the object were carried out from Vainu Bappu Observatory, Kavalur, to probe the nature of the secondary companion and to understand the post common-envelope evolution of such objects. Spectral line equivalent widths (EW) exhibit orbital phase dependent variations, indicating the probable contribution from the secondary. A period variation study of the object was carried out using times of minima obtained from the literature and suggesting a decrease in period. The evolutionary state of the system is evaluated and discussed.