Active chromosphere in the carbon star TW Horologium

Details Active chromosphere in the carbon star TW Horologium Active chromosphere in the carbon star TW Horologium

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983msngr..31....7b&link_type=abstract

ESO Messenger (ISSN 0722-6691), March 1983, p. 7-11.

Other

7

Carbon Stars, Chromosphere, Emission Spectra, Stellar Spectra, H Lines, K Lines, Radiant Flux Density, Spectral Energy Distribution, Stellar Atmospheres, Stellar Envelopes, Stellar Models, Stellar Temperature, Ultraviolet Absorption, Ultraviolet Spectra

Scientific paper

Chromospheric variable activity is for the first time reported in a cool, low gravity star of the carbon class, TW Hor. It is noted that the outer layers of TW Hor consist of a photosphere, a warm chromosphere, and a circumstellar shell, representing a situation similar to that seen in M giants of late type, but with different temperatures. This scenario may be extended to other carbon stars. The relatively high UV luminosity of TW Hor allowed the detection of features that may also be present in stars which are fainter in the UV. A conspicuous feature is the strong UV absorption underlined by the theoretical flux curves of carbon stars, by contrast to the M stars, offering the strongest proof to date of the presence of dust grains absorbing in the UV spectral range in C stars.

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