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On the binary nature of 1RXS J162848.1−415241

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Torres, M. A. P., Garcia, M. R., Steeghs, D. and McClintock, Jeffrey E. (2005) On the binary nature of 1RXS J162848.1−415241. The Astrophysical Journal, Vol.632 (No.1). pp. 514-522. doi:10.1086/432907 ISSN 0004-637X.

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Official URL: http://dx.doi.org/10.1086/432907

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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, Engineering and Medicine > 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
Official Date: 2005
Dates:
DateEvent
2005Published
Volume: Vol.632
Number: No.1
Page Range: pp. 514-522
DOI: 10.1086/432907
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 22 December 2015
Date of first compliant Open Access: 22 December 2015
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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