Other
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.5602o&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #56.02; Bulletin of the American Astronomical Society, Vol. 30, p.902
Other
Scientific paper
The Far Ultraviolet Spectroscopic Explorer (FUSE) will observe many stars in the 905--1187 Angstroms spectral region with a resolving power of 24,000--30,000. FUSE will explore this critically important spectral region, which is mostly inaccessible to HST (and previously to IUE), observing sources much fainter than Copernicus and with much better spectral resolution than HUT or ORFEUS. We present simulations of stellar spectra that will be observed with FUSE. The FUSE bandpass includes the Ly beta (1025 Angstroms)\ and Ly gamma (972 Angstroms)\ lines. Extrapolating from GHRS Ly alpha spectra, we simulate FUSE spectra of the Ly beta and Ly gamma lines of Capella and some other late-type stars. These simulations will address the accuracy with which the interstellar D/H ratio can be measured using these lines. In addition, one of our FUSE observing programs will measure for the first time the amount of warm (60,000--300,000 K) plasma present in the outer atmospheres of A and early-F stars, using the C III 977 Angstroms and O VI 1032 Angstroms lines. This program will explore whether the outer atmospheric layers of these stars are heated to these temperatures and whether the heating process is magnetic or acoustic. Our simulations indicate that FUSE will be sensitive enough to measure very low luminosities in these lines. This work is supported by NASA grants to the University of Colorado.
Linsky Jeffrey L.
O'Neal Douglas
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