On the Binary Nature of 1RXS J162848.1−415241 | Zendy

M. A. P. Torres | Zendy; M. R. Garcia | Zendy; D. Steeghs | Zendy; Jeffrey E. McClintock | Zendy

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On the Binary Nature of 1RXS J162848.1−415241

Author(s) -

M. A. P. Torres,

M. R. Garcia,

D. Steeghs,

Jeffrey E. McClintock

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/432907

Subject(s) - astrophysics , physics , white dwarf , binary number , mass ratio , orbital period , spectral line , amplitude , star (game theory) , astronomy , emission spectrum , spectroscopy , stars , optics , arithmetic , mathematics

We present spectroscopy of the optical counterpart to 1RXS J162848.1-41524,also known as the microquasar candidate MCQC J162847-4152. All the dataindicate that this X-ray source is not a microquasar, and that it is asingle-lined chromospherically active binary system with a likely orbitalperiod of 4.9 days. Our analysis supports a K3IV spectral classification forthe star, which is dominant at optical wavelengths. The unseen binary componentis most likely a late-type (K7-M) dwarf or a white dwarf. Using the highresolution spectra we have measured the K3 star's rotational broadening to bevsini = 43 +/- 3 km/s and determined a lower limit to the binary mass ratio ofq(=M2/M1)>2.0. The high rotational broadening together with the strong CaII H &K / Halpha emission and high-amplitude photometric variations indicate that theevolved star is very chromospherically active and responsible for theX-ray/radio emission.Comment: 15 pages, 5 figures, accepted for publication in Ap

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