Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..389p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 1, 1987, p. 389-411. Research supported by the Niels Stensen Foun
Astronomy and Astrophysics
Astrophysics
51
Giant Stars, Stellar Mass Ejection, Stellar Spectrophotometry, Stellar Winds, Ultraviolet Spectra, Variable Stars, Iue, Line Spectra, Spectrum Analysis, Stellar Models
Scientific paper
Fifty-six high-resolution ultraviolet IUE observations of ξ Per [O7.5 III] are presented. The optically thick C IV and N V resonance doublets yield a terminal velocity of v = 2600 km s-1. The spectra reveal dramatic variability in the Si IV P Cygni profiles down to short time scales (≡1 hr). The morphology of the variations is characterized by broad low-velocity (0.5 - 0.7 v) absorption enhancements and high-velocity (≡0.8 v) discrete narrow absorption components. The data suggest evidence that the broad absorption features may gradually evolve into the high-velocity components. Characteristics of the P Cygni profiles, including emission to absorption ratios and mass loss rates, are derived. The role of ionization conditions and episodic formation of shells in accounting for the variability is discussed.
Henrichs Huib F.
Howarth Ian D.
Prinja Raman K.
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