INFRARED EXCESSES IN EARLY-TYPE STARS: FREE-FREE EMISSION

It has been previously shown that some hot stars exhibit infrared excesses which may be explained by high-temperature (T ~ 10,000° K) free-free emission. We demonstrate that the infrared color excesses of many other hot stars may be explained as low-temperature (T < 3000° free-free emission. We p...

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Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 1972-10, Vol.84 (501), p.597-612
Main Authors: DYCK, H. M., MILKEY, R. W.
Format: Article
Language:English
Subjects:
Circumstellar shells
Electron emission
Electrons
Emission spectra
H II regions
Hot stars
Hydrogen
Ionization
Photons
Stars
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Summary:It has been previously shown that some hot stars exhibit infrared excesses which may be explained by high-temperature (T ~ 10,000° K) free-free emission. We demonstrate that the infrared color excesses of many other hot stars may be explained as low-temperature (T < 3000° free-free emission. We present a model for the circumstellar region in which metal atoms are radiatively ionized by the stellar flux and infrared emission occurs from eminus free-free transitions.
ISSN:0004-6280
1538-3873
DOI:10.1086/129341