Determination of mass and orbital parameters of a low-mass star HD 213597B

Priyanka Chaturvedi, Rohit Deshpande, Vaibhav Dixit, Arpita Roy, Abhijit Chakraborty, Suvrath Mahadevan, B. G. Anandarao, Leslie Hebb, P. Janardhan

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4 Scopus citations

Abstract

HD 213597 is an eclipsing binary system which was detected by the STEREO spacecraft and was speculated to host a low-mass stellar companion. We used high-resolution spectroscopy with the 10-m Hobby-Eberly Telescope and the 1.2-m telescope in Mount Abu for radial velocity (RV) measurements of this source. We performed aperture photometry for this star on the STEREO archival data and thereby confirm the transit signature. We also did followup ground-based photometry with a 10-inch telescope from Mt Abu. The spectroscopic RV semi-amplitude of the primary (33.39 km s-1) indicates that the secondary is an M dwarf making the system a short period F+Meclipsing binary. These RVs along with the inclination derived from our combined photometric analysis (i = 84. {ring operator} 9), enable us to estimate the mass of the secondary as MB ~ 0.286M ⊙ and radius as RB ~ 0.344 R ⊙ using an estimated mass MA ~ 1.3M ⊙ and radius RB ~ 1.97 R ⊙ of the primary. Our spectral analysis returned the following parameters: Teff = 6625 ± 121 K, [Fe/H]=-0.095 ± 0.08 and log g = 3.72 ± 0.22 for the primary. When log g is constrained to a value of 3.96, we derive Teff = 6753 ± 52 K and [Fe/H]=-0.025 ± 0.05.

Original languageEnglish (US)
Article numberstu1127
Pages (from-to)3737-3744
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume442
Issue number4
DOIs
StatePublished - Aug 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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