Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...442..328r&link_type=abstract
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 442, no. 1, p. 328-336
Astronomy and Astrophysics
Astrophysics
18
Absorptance, Giant Stars, K Stars, Line Spectra, M Stars, Magnesium, Stellar Luminosity, Stellar Winds, Supergiant Stars, Comparison, Hubble Space Telescope, Iue, Radiative Transfer, Spectral Line Width, Spectrum Analysis, Velocity Distribution
Scientific paper
Using high-resolution spectroscopic data taken with the Goddard High Resolution Spectrographic (GHRS) aboard the Hubble Space Telescope (HST) and with the International Ultraviolet Explorer (IUE) satellite, we compare the profiles of the Mg II h and k lines seen in stars with spectral types ranging from early K through mid-M and luminosities from giants to supergiants. For all of these stars the lines are broad emission features with a central absorption. When plotted on a velocity scale the absorption features of the h and k lines agree very well in both shape and position, as do the blue wings of the emission component. The red wings of the emission, however, show a pronounced difference, with the k line wing consistently shifted to the red of the h line wing. At present the reason for this discrepancy is unknown, but we suggest several possibilities, including radiative transfer effects and high-speed stellar winds.
Carpenter Kenneth G.
Robinson Richard D.
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