Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18311412a&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #114.12; Bulletin of the American Astronomical Society, Vol. 25, p.1463
Astronomy and Astrophysics
Astronomy
Scientific paper
The Voyager Ultraviolet Spectrometer (UVS) data on O and B stars has proven to be valuable in the study of interstellar extinction. This region of the spectrum is particularly interesting because dust opacity is much higher in the UV wavelengths than in the visible or IR. In this work, we estimate the abundance of molecular hydrogen by combining known extinction curves with stellar atmosphere models. In Snow, Allen & Polidan (1990, ApJ, 359, L27), we derived extinction curves by comparing reddened and unreddened stars of like spectral type. In that work, the spectra were first corrected for known amounts of H_2 absorption. High column densities of H_2 appear as a series of absorption lines below 1150 Angstroms which, at Voyager resolution, mimics the effect of additional dust absorption. The current study uses known extinction and model spectra to estimate the column density of H_2 along several lines of sight. We do this by first selecting an extinction curve to de-redden the star and then finding the column density of H_2 which gives the best match to the appropriate Kurucz model spectrum. This is an iterative process which selects the best combination of extinction curve and H_2 column density that matches the model stellar spectrum.
Allen Marsha M.
Snow Theodore P.
No associations
LandOfFree
Molecular Hydrogen Column Densities in the Lines of Sight to Voyager Stars 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 Molecular Hydrogen Column Densities in the Lines of Sight to Voyager Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular Hydrogen Column Densities in the Lines of Sight to Voyager Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-781847