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- Title
Near-infrared spectroscopy of 20 new Chandra sources in the Norma arm.
- Authors
Rahoui, F.; Tomsick, J. A.; Fornasini, F. M.; Bodaghee, A.; Bauer, F. E.
- Abstract
We report on CTIO/NEWFIRM and CTIO/OSIRIS photometric and spectroscopic observations of 20 new X-ray (0.5–10 keV) emitters discovered in the Norma arm Region Chandra Survey (NARCS). NEWFIRM photometry was obtained to pinpoint the nearinfrared counterparts of NARCS sources, while OSIRIS spectroscopy was used to help identify 20 sources with possible high mass X-ray binary properties. We find that (1) two sources are WN8 Wolf-Rayet stars, maybe in colliding wind binaries, part of the massive star cluster Mercer 81; (2) two are emission-line stars, possibly in X-ray binaries, that exhibit near- and mid-infrared excesses either due to free-free emission from the decretion discs of Be stars or warm dust in the stellar winds of peculiar massive stars such as B[e] supergiants or luminous blue variables; (3) one is a B8-A3 IV-V star that could be in a quiescent high mass X-ray binary system; (4) two are cataclysmic variables including one intermediate polar; (5) three may be neutron star symbiotic binaries; (6) five are most likely white dwarf symbiotic binaries; and (7) five exhibit properties more consistent with isolated giant/dwarf stars. The possible detection of one to three high mass X-ray binaries is in good agreement with our predictions. However, our study illustrates the difficulty of clearly differentiating quiescent or intermediate X-ray luminosity systems from isolated massive stars, which may lead to an underestimation of the number of known high mass X-ray binaries.
- Subjects
X-ray binaries; NEAR infrared spectroscopy; CATACLYSMIC variable stars; DWARF stars; STELLAR mass; STELLAR photometry
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2014, Vol 568, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201424006