Computer Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3496w&link_type=abstract
HST Proposal ID #3496
Computer Science
Hst Proposal Id #3496
Scientific paper
The GHRS will be utilized to obtain a high signal-to-noise, intermediate resolution (R=25000), ultraviolet spectrum of the bright A1V star Sirius for the wavelength range 1280 to 3180 A. Such a spectrum will place severe constraints upon flux distributions generated by stellar model atmospheres. Modeled flux distributions consistently over-estimate the ultraviolet flux as a result of an incomplete treatment of the atomic line opacity. The modeled effective temperatures are therefore too hot and systematic errors propagate into subsequent analyses, such as for elemental abundances. Treatment of the ultraviolet opacity is especially poor below 2000A. Of particular interest are the singly and doubly ionized elements of the iron-group (Z=21-28) since they represent a vast number of discrete transitions that are responsible for the bulk of the ultraviolet opacity in warm stars. The spectral atlas obtained for Sirius will provide the high quality line profiles over an extended wavelength range that are necessary for determining consistent atomic parameters and elemental abundances. Even though Sirius has been well studied in the visual region the majority of its flux and the dominant opacity species lie in the ultraviolet. Many elemental species that have few or no transitions in the visual region will have their abundances determined for the first time.
No associations
LandOfFree
An Ultraviolet Atlas of Sirius: Constraining Model Stellar Atmospheres does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An Ultraviolet Atlas of Sirius: Constraining Model Stellar Atmospheres, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An Ultraviolet Atlas of Sirius: Constraining Model Stellar Atmospheres will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1206841