Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406l..21c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 406, no. 1, p. L21-L23.
Astronomy and Astrophysics
Astronomy
10
Absorption Spectra, Helium, Infrared Astronomy, Line Spectra, O Stars, Stellar Spectra, H Ii Regions, Infrared Spectra, Ionized Gases
Scientific paper
We 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.
Block David L.
Conti Peter S.
Geballe Thomas Ronald
Hanson Margaret Murray
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