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First detection of ionized helium absorption lines in infrared K band spectra of O-type starsWe have obtained high SNR, moderate-resolution K band spectra of two early O-type main sequence stars, HD 46150 O5 V, and HD 46223 O4 V, in the Rosette Nebula. We report the detection, for the first time, of the 2.189 micron He II line in O-type stars. Also detected is the 2.1661 micron Br-gamma line in absorption. The 2.058 micron He I line appears to be present in absorption in both stars, although its appearance at our resolution is complicated by atmospheric features. These three lines can form the basis for a spectral classification system for hot stars in the K band that may be used at infrared wavelengths to elucidate the nature of those luminous stars in otherwise obscured H II and giant H II regions.
Document ID
19930049489
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Conti, Peter S.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Block, David L.
(ESO, Garching, Germany; Witwatersrand Univ. South Africa)
Geballe, T. R.
(Joint Astronomy Center Hilo, HI, United States)
Hanson, Margaret M.
(Colorado Univ. Boulder, United States)
Date Acquired
August 16, 2013
Publication Date
March 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 406
Issue: 1
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
93A33486
Funding Number(s)
CONTRACT_GRANT: NSF AST-90-15240
Distribution Limits
Public
Copyright
Other

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