Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284l..27m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 2, p. L27-L30
Astronomy and Astrophysics
Astronomy
13
Bromine, Infrared Astronomy, Infrared Spectra, Line Spectra, O Stars, Stellar Atmospheres, B Stars, Balmer Series, Morphology, Stellar Spectrophotometry, Stellar Structure
Scientific paper
We report the presence of Br alpha and Br gamma emission features in the infrared spectrum of the O9V MK standard star 10 Lac. Waters et al. (1993) have reported similar emission in the spectrum of the B0.2V star tau Sco and have suggested that the emission is from a low-density disk and that tau Sco is a mild, pole-on member of the Be class of stars. We argue that such emission features arise as a natural consequence of the structure of these stars' outer atmospheres, thus eliminating the need to introduce departures from spherical symmetry. Indeed, theoretical Br alpha and Br gamma line profiles calculated using stellar parameters derived for 10 Lac by Grigsby et al. (1992) show a striking similarity to our observations.
Anderson Lawrence S.
Drew Janet E.
Murdoch Kaylene A.
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