Infrared Excesses in Early-Type Stars: Free-Free Emission
Abstract
INFRARED EXCESSES IN EARLY-TYPE STARS: FREE-FREE EMISSION* H. M. DYCK AND R. W. MILKEY Kitt Peak National Observatoryt 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 K) 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 H-minus free-free transitions. Key words: infrared excesses - early-type stars - free-free emission
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- October 1972
- DOI:
- 10.1086/129341
- Bibcode:
- 1972PASP...84..597D