The infrared excess of cool giant stars - A chromospheric contribution

Details The infrared excess of cool giant stars - A chromospheric contribution The infrared excess of cool giant stars - A chromospheric contribution

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.172..277l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 172, Aug. 1975, p. 277-288.

Astronomy and Astrophysics

Astronomy

25

Chromosphere, Giant Stars, Infrared Astronomy, M Stars, Stellar Atmospheres, Stellar Radiation, Cosmic Dust, Photosphere, Stellar Spectra, Stellar Temperature

Scientific paper

The idea that the infrared excesses of evolved M stars may contain a contribution from a chromosphere is explored using alpha Ori and W Hya as test cases. The spectrum of alpha Ori between 8 and 30 millimicrons can be interpreted satisfactorily in terms of three components: a photosphere, a silicate dust cloud, and a cool chromosphere (temperature about 5000 K), which is optically thick at 14 millimicrons. A similar modelling for W Hya suggests a hotter chromosphere (temperature about 8000 K), with unit optical depth at 30 millimicrons. Some consequences of these chromospheres are briefly discussed.

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