Torres, M. A. P., Garcia, M. R., Steeghs, D. (Danny), 1972- and McClintock, Jeffrey E.. (2005) On the binary nature of 1RXS J162848.1−415241. The Astrophysical Journal, Vol.632 (No.1). pp. 514-522. ISSN 0004-637X

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Abstract

We present spectroscopy of the optical counterpart to 1RXS J162848.1-41524, also known as the microquasar candidate MCQC J162847-4152. All the data indicate that this X-ray source is not a microquasar and that it is a single-lined chromospherically active binary system with a likely orbital period of 4.9 days. Our analysis supports a K3 IV spectral classification for the star, which is dominant at optical wavelengths. The unseen binary component is most likely a late-type (K7-M) dwarf or a white dwarf. Using the high-resolution spectra, we have measured the K3 star's rotational broadening to be v sin i = 43 ± 3 km s-1 and determined a lower limit to the binary mass ratio of q(= M2/M1) > 2.0. The high rotational broadening together with the strong Ca II H and K/Hα emission and high-amplitude photometric variations indicate that the evolved star is very chromospherically active and responsible for the X-ray/radio emission.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Quasars, Double stars
Journal or Publication Title:	The Astrophysical Journal
Publisher:	Institute of Physics Publishing Ltd.
ISSN:	0004-637X
Date:	2005
Volume:	Vol.632
Number:	No.1
Page Range:	pp. 514-522
Identification Number:	10.1086/432907
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	United States. National Aeronautics and Space Administration (NASA), Smithsonian Astrophysical Observatory
Grant number:	NAG-5-10889 (NASA), NAS8-39073 (NASA)
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URI:	http://wrap.warwick.ac.uk/id/eprint/49489

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