Multiwavelength observations of the runaway binary HD 15137

M. Virginia McSwain, Michal De Becker, Mallory S.E. Roberts, Tabetha S. Boyajian, Douglas R. Gies, Erika D. Grundstrom, Christina Aragona, Amber N. Marsh, Rachael M. Roettenbacher

Research output: Contribution to journalArticle

Abstract

HD 15137 is an intriguing runaway O-type binary system that offers a rare opportunity to explore the mechanism by which it was ejected from the open cluster of its birth. Here, we present recent blue optical spectra of HD 15137 and derive a new orbital solution for the spectroscopic binary and physical parameters of the O star primary. We also present the first XMM-Newton observations of the system. Fits of the EPIC spectra indicate soft, thermal X-ray emission consistent with an isolated O star. Upper limits on the undetected hard X-ray emission place limits on the emission from a proposed compact companion in the system, and we rule out a quiescent neutron star (NS) in the propeller regime or a weakly accreting NS. An unevolved secondary companion is also not detected in our optical spectra of the binary, and it is difficult to conclude that a gravitational interaction could have ejected this runaway binary with a low mass optical star. HD 15137 may contain an elusive NS in the ejector regime or a quiescent black hole with conditions unfavorable for accretion at the time of our observations.

Original languageEnglish (US)
Pages (from-to)857-864
Number of pages8
JournalAstronomical Journal
Volume139
Issue number3
DOIs
StatePublished - 2010

Keywords

  • Binaries: spectroscopic
  • Stars: individual (HD 15137)
  • X-rays: binaries

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    McSwain, M. V., De Becker, M., Roberts, M. S. E., Boyajian, T. S., Gies, D. R., Grundstrom, E. D., Aragona, C., Marsh, A. N., & Roettenbacher, R. M. (2010). Multiwavelength observations of the runaway binary HD 15137. Astronomical Journal, 139(3), 857-864. https://doi.org/10.1088/0004-6256/139/3/857