Science Assessment Observations of the Hg-Rich CP Star Chi Lup

Details Science Assessment Observations of the Hg-Rich CP Star Chi Lup Science Assessment Observations of the Hg-Rich CP Star Chi Lup

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.3022e&link_type=abstract

HST Proposal ID #3022

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #3022 Stellar Astrophysics

Scientific paper

The rich ultraviolet absorption spectrum of the ultra-sharp- lined, chemically peculiar star, chi Lup, will be used to ascertain fundamental performance properties of the combined OTA/GHRS in the 1900-2000 angstrom region and will provide important scientific information about the origin of abundance and isotopic anomalies of Hg in the star's photosphere. Intercomparison of high (R=85000) and medium (R=28000) dispersion spectra, centered on the Hg II resonance line at 1942 angstroms, will be obtained in both science apertures to assess the following: 1. spectral resolution, 2. effects of echelle mode scattered light background, photocathode graularity, etc., on the photometric accuracy of the data, 3. overall OTA/GHRS instrumental profile 4. performance of on-board doppler velocity compensation, 5. preservation of information content in deconvolved spectra, and 6. relative throughput of small and large apertures. A single, accurate observation of the Hg II resonance line at 1942 A can directly verify or refute the optical region, 3984 A, claim of an extraordinary Hg isotope anomaly in chi Lup, and yield a more accurate Hg/H abundance ratio, providing information about the origin of this type of abundance anomaly.

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