Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...223..237m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 223, no. 1-2, Oct. 1989, p. 237-240.
Astronomy and Astrophysics
Astrophysics
20
Emission Spectra, Infrared Spectroscopy, Magellanic Clouds, Stellar Spectra, Supergiant Stars, B Stars, Carbon Monoxide, O Stars, Stellar Envelopes, Stellar Luminosity, Titanium Oxides
Scientific paper
Spectra in the 2-micron region are presented for the SMC B(e) supergiants R4, R50, and Hen S18, and for the LMC Ofpe/WN9 stars, BE 381 and HD 269927c. CO first-overtone bandhead emission is present in R4, but is not detected in either of R50 or Hen S18. The latter result is discussed in relation to the recent detection by Zickgraf et al. (1989) of TiO emission in Hen S18 and three LMC B(e) supergiants. The two Ofpe/WN9 stars do not possess the strong He I 2.058-micron emission relative to H I Br-gamma which has been found in several other members of this class. These two stars belong to Walborn's HD 269227 subclass of the Ofpe/WN9 stars. The absence of He I 2.058-micron emission in their spectra is consistent with the suggestion of Bohannan and Walborn (1989) that this subclass is characterized by a higher level of excitation than other class members.
Hyland A. R.
McGinn M. T.
McGregor Peter J.
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