The Stellar Content of Obscured Galactic Giant H [CSC]ii[/CSC] Regions. II. W42 | Zendy

Robert Blum | Zendy; Peter S. Conti | Zendy; A. Damineli | Zendy

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The Stellar Content of Obscured Galactic Giant H [CSC]ii[/CSC] Regions. II. W42

Author(s) -

Robert Blum,

Peter S. Conti,

A. Damineli

Publication year - 2000

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/301317

Subject(s) - physics , astrophysics , star formation , star cluster , luminosity , stars , cluster (spacecraft) , luminosity function , galactic center , h ii region , astronomy , stellar classification , galaxy , computer science , programming language

We present near infrared J, H, and K images and K-band spectroscopy in thegiant HII region W42. A massive star cluster is revealed; the color-color plotand K-band spectroscopic morphology of two of the brighter objects suggest thepresence of young stellar objects. The spectrum of the bright central star issimilar to unobscured stars with MK spectral types of O5-O6.5. If this star ison the zero age main sequence, then the derived spectrophotometric distance isconsiderably smaller than previous estimates. The Lyman continuum luminosity ofthe cluster is a few times that of the Trapezium. The slope of the K-bandluminosity function is similar to that for the Trapezium cluster andsignificantly steeper than that for the massive star cluster in M17 or theArches cluster near the Galactic center.Comment: 30 pages, 11 figures, late

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