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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
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 | ||||
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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: |
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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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