A Survey of Nearby Cool Dwarf Star Spectra Obtained by FUSE

Details A Survey of Nearby Cool Dwarf Star Spectra Obtained by FUSE A Survey of Nearby Cool Dwarf Star Spectra Obtained by FUSE

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.1312r&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #13.12; Bulletin of the American Astronomical Society, Vol. 33, p.1329

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present the cool star dwarf spectra obtained by the FUSE Science Team using the Far Ultraviolet Spectroscopic Explorer (FUSE). The survey includes the stars α Aql, α Cen A, α Cen B, ɛ Eri, AU Mic, and AB Dor. The spectral range extends from 900 to 1200 ~Å, at a spectral resolution of λ /Δ λ ~ 20,000. Numerous emission lines are present and identified. Lines of particular interest, such as C III (977 Å), O VI (1032 and 1038 Å), and the Lyman series, are present in all stars and studied in detail. The forbidden coronal Fe XVIII (975 Å) line is present in some spectra and is useful in studying the dynamics of the 107 K coronal plasma. Absorption by warm Local Interstellar Medium (LISM) gas is visible in several lines, such as C III (977 Å) and C II (1037 Å). Combined with LISM absorption studies of the same stars at longer wavelengths (ie. using spectrographs aboard the Hubble Space Telescope (HST)), the FUSE LISM absorption can provide important insights into the structure of the nearby warm ISM. This atlas of nearby cool stars in the far-ultraviolet provides important information pertaining to the atmospheres of dwarf stars and will be a useful tool in planning future observations of cool stars. This work is based on data obtained for the Guaranteed Time Team by the NASA-CNES-CSA FUSE mission operated by the Johns Hopkins Observatory. Financial support to U.S. participants has been provided by NASA contract NAS5-32985.

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