Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107..240d&link_type=abstract
Astronomy and Astrophysics, vol. 107, no. 2, Mar. 1982, p. 240-246. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astronomy
59
B Stars, Early Stars, Infrared Astronomy, Infrared Photometry, Stellar Spectra, Stellar Spectrophotometry, Variable Stars, Emission Spectra, H Alpha Line, Stellar Envelopes, Stellar Magnitude
Scientific paper
Infrared broadband photometry in the JHKLM bands is presented for 46 bright southern early-type emission-line stars, and is compared to Balmer emission line strengths measured for the same stars at closely neighboring epochs. For Be stars earlier than about B6e, infrared excesses measured by the J-M color index are strongly correlated to the equivalent widths of H-alpha emission lines, which confirms the interpretation of infrared excesses in early-type Be stars as hydrogen-free-free emission from circumstellar envelopes. Time variations are derived and discussed, and it is concluded that infrared and light variations of early-type Be stars are due to variations of density and the extent of the circumstellar envelope around the stars.
Dachs Joachim
Wamsteker Willelm
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