Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542711m&link_type=abstract
American Astronomical Society, AAS Meeting #215, #427.11; Bulletin of the American Astronomical Society, Vol. 42, p.344
Astronomy and Astrophysics
Astronomy
Scientific paper
UV Spectral Synthesis of Sirius A
We report the first results from a study of the fundamental physical properties of the A1 V star Sirius A. Using archival spectrophotometric data from the Hubble Space Telescope's STIS spectrograph, we have produced a synthetic UV spectrum of the star. The data were obtained at medium resolution with the G160M, G200M, and G270M gratings (FWHM 15 km/s) and cover the wavelength range 1265-3200 Angstroms. The synthetic spectrum was constructed using Kurucz's ATLAS9 LTE stellar atmospheric models and Hubeny's SYNSPEC spectral synthesis program and is a function of the star's effective temperature, surface gravity, microturbulence velocity, rotational velocity, radial velocity, and chemical composition. A chi2-minimization program was used to find the values of these parameters which produce the best match of the synthetic spectrum with the observed spectrum. In addition to determining the stellar properties, this program can illuminate - and help rectify - deficiencies in the spectral line database used to construct the synthetic spectra. In this poster, we illustrate the first results from this program, including the quality of the match between the observed and computed spectra and the elemental abundance profile of Sirius A, including CNO, the light metals (e.g., Si and Al), and the Fe group.
Fitzpatrick Edward
McClain Timothy
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