Outer layers of a carbon star: The view from the Hubble Space Telescope

Details Outer layers of a carbon star: The view from the Hubble Space Telescope Outer layers of a carbon star: The view from the Hubble Space Telescope

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...443..281j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 443, no. 1, p. 281-294

Astronomy and Astrophysics

Astronomy

19

Asymptotic Giant Branch Stars, Carbon Stars, Chromosphere, Stellar Mass, Stellar Winds, Ultraviolet Astronomy, Ultraviolet Spectra, Velocity Distribution, Fluorescence, Hubble Space Telescope, Photosphere, Stellar Envelopes

Scientific paper

To advance our understanding of the relationship between stellar chromospheres and mass loss, which is a common property of carbon stars and other asymptotic giant branch stars, we have obtained ultraviolet spectra of the nearby N-type carbon star UU Aur using the Hubble Space Telescope (HST). In this paper we describe the HST observations, identify spectral features in both absorption and emission, and attempt to infer the velocity field in the chromosphere, upper troposphere, and circumstellar envelope from spectral line shifts. A mechanism for producing fluoresced emission to explain a previously unobserved emission line is proposed. Some related ground-based observations are also described.

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