H-Band spectroscopic classification of OB stars

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Title: H-Band spectroscopic classification of OB stars
Author: Blum, Robert; Ramond, T.; Conti, P.; Figer, Donald; Sellgren, K.
Abstract: We present a new spectroscopic classification for OB stars based on H-band (1.5 micron to 1.8 micron) observations of a sample of stars with optical spectral types. Our initial sample of nine stars demonstrates that the combination of He I 1.7002 micron and H Brackett series absorption can be used to determine spectral types for stars between about O4 and B7 (to within about 2 sub-types). We find that the Brackett series exhibits luminosity effects similar to the Balmer series for the B stars. This classification scheme will be useful in studies of optically obscured high mass star forming regions. In addition, we present spectra for the OB stars near 1.1 micron and 1.3 micron which may be of use in analyzing their atmospheres and winds.
Description: Also archived at: arXiv:astro-ph/9702237 v1 27 Feb 1997
Record URI: http://hdl.handle.net/1850/2014
Date: 1997-05

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