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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
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WRAP_Steeghs_Binary_0506362.pdf - Accepted Version Download (586Kb) | Preview |
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 | ||||
|---|---|---|---|---|---|
| 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 | ||||
| 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 | ||||
| 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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