Candidate X-Ray-emitting OB Stars in MYStIX Massive Star-forming Regions

Matthew S. Povich, Heather A. Busk, Eric D. Feigelson, Leisa K. Townsley, Michael A. Kuhn

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Massive O-type and early B-type (OB) stars in the nearby Galaxy remain incompletely cataloged due to high extinction, bright visible and infrared nebular emission in H ii regions, and high field star contamination. These difficulties are alleviated by restricting the search to stars with X-ray emission. Using the X-ray point sources from the Massive Young Star-forming Complex Study in Infrared and X-Rays (MYStIX) survey of OB-dominated regions, we identify 98 MYStIX candidate OB (MOBc) stars by fitting their 1-8 μm spectral energy distributions (SEDs) with reddened stellar atmosphere models. We identify 27 additional MOBc stars based on JHK S photometry of X-ray stars lacking SED fitting. These candidate OB stars indicate that the current census of stars earlier than B1, taken across the 18 MYStIX regions studied, is less than 50% complete. We also fit the SEDs of 239 previously published OB stars to measure interstellar extinction and bolometric luminosities, revealing six candidate massive binary systems and five candidate O-type (super)giants. As expected, candidate OB stars have systematically higher extinction than previously published OB stars. Notable results for individual regions include identification of the OB population of a recently discovered massive cluster in NGC 6357, an older OB association in the M17 complex, and new massive luminous O stars near the Trifid Nebula. In several relatively poorly studied regions (RCW 38, NGC 6334, NGC 6357, Trifid, and NGC 3576), the OB populations may increase by factors of ≳2.

Original languageEnglish (US)
Article number61
JournalAstrophysical Journal
Volume838
Issue number1
DOIs
StatePublished - Mar 20 2017

Fingerprint

massive stars
stars
x rays
extinction
spectral energy distribution
energy
point source
young
census
early stars
interstellar extinction
O stars
stellar atmospheres
star distribution
atmosphere
nebulae
point sources
photometry
distribution
contamination

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Povich, Matthew S. ; Busk, Heather A. ; Feigelson, Eric D. ; Townsley, Leisa K. ; Kuhn, Michael A. / Candidate X-Ray-emitting OB Stars in MYStIX Massive Star-forming Regions. In: Astrophysical Journal. 2017 ; Vol. 838, No. 1.
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Candidate X-Ray-emitting OB Stars in MYStIX Massive Star-forming Regions. / Povich, Matthew S.; Busk, Heather A.; Feigelson, Eric D.; Townsley, Leisa K.; Kuhn, Michael A.

In: Astrophysical Journal, Vol. 838, No. 1, 61, 20.03.2017.

Research output: Contribution to journalArticle

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