First results from the Goddard High-Resolution spectrograph - High-resolution observations of the 1942 A resonance line of HG II in the chemically peculiar B star, Chi Lupi
Journal Article
·
· Astrophysical Journal; (United States)
- NASA, Goddard Space Flight Center, Greenbelt, MD (United States) Computer Sciences Corp., Greenbelt, MD (United States) Lund Univ. (Sweden)
The Goddard High-Resolution Spectrograph on the HST has been used to obtain high S/N observations of the sharp-lined, Hg- and Pt-rich B-type star, Chi Lupi, with a resolving power of 87,000. The observations reveal a level of spectroscopic detail never before observed at ultraviolet wavelengths for any star other than the sun. Concentrating on the region around the resonance line of Hg II at 1942 A, the profile and central position of this line confirm beyond doubt that the Hg isotope anomaly in Chi Lupi is real and extreme, with Hg being heavily concentrated in the form of Hg-204. The problems in atomic physics which impair the accurate analysis of spectra of this quality are emphasized. 23 refs.
- OSTI ID:
- 5157121
- Journal Information:
- Astrophysical Journal; (United States), Journal Name: Astrophysical Journal; (United States) Vol. 377; ISSN ASJOA; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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