FUSE Observations of the σ Her Circumstellar Environment

Details FUSE Observations of the σ Her Circumstellar Environment FUSE Observations of the σ Her Circumstellar Environment

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.1307c&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #13.07; Bulletin of the American Astronomical Society, Vol. 33, p.1328

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a far ultraviolet spectrum of the dusty debris disk star σ Her, obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE). We observe absorption in the excited fine structure lines of C 2 at 1037 Å \ and N 2 at 1085 and 1086 Å \ with zero velocity relative to the star. Since these features are considerably narrower than the stellar features and broader than than the interstellar features, the C 2 and N 2 are circumstellar. We derive column densities, gas kinetic temperatures, and minimum gas masses for the C 2 and N 2 to compare with the amount of dust inferred from the infrared. We also place upper limits on the column denisities of CO and C 1 to elucidate the carbon chemistry around σ Her.

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