Near Infra-Red Magnitudes of 248 Early-Type Emission-Line Stars and Related Objects
Open Access
- 1 February 1973
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 161 (2) , 145-166
- https://doi.org/10.1093/mnras/161.2.145
Abstract
Nearly 250 early-type emission-line stars have been observed in the near infra-red; approximately two thirds of these are found to exhibit excess radiation at these wavelengths. Two distinct mechanisms may contribute to the infra-red excesses: thermal radiation from circumstellar dust, and electron bremsstrahlung originating in a shell of ionized gas. It is not currently possible to distinguish between these two alternatives using infra-red photometry alone.Keywords
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