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Title:
Time series observations of O stars. I - IUE observations of variability in the stellar wind of Zeta Puppis
Authors:
Prinja, R. K.; Balona, L. A.; Bolton, C. T.; Crowe, R. A.; Fieldus, M. S.; Fullerton, A. W.; Gies, D. R.; Howarth, I. D.; McDavid, D.; Reid, A. H. N.
Affiliation:
AA(University College, London, England), AB(South African Astronomical Observatory, Observatory, Republic of South Africa), AC(David Dunlap Observatory, Richmond Hill, Canada), AD(Hawaii, University, Hilo), AE(Toronto, University, Canada), AF(Bartol Research Institute, Newark, DE), AG(Georgia State University, Atlanta), AH(University College, London, England), AI(Texas, University, San Antonio), AJ(University College, London, England)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 1, May 1, 1992, p. 266-272. Research supported by Royal Society, University of Toronto, and Bartol Research Institute. (ApJ Homepage)
Publication Date:
05/1992
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
EARLY STARS, STELLAR MASS EJECTION, STELLAR SPECTRA, STELLAR WINDS, ULTRAVIOLET ASTRONOMY, ULTRAVIOLET SPECTRA, ABSORPTION SPECTRA, IUE, LINE SPECTRA, SATELLITE OBSERVATION, SPECTRUM ANALYSIS, TIME SERIES ANALYSIS
DOI:
10.1086/171276
Bibliographic Code:
1992ApJ...390..266P

Abstract

Stellar wind variability in Zeta Pup (O4 I(n)f) is described based on 31 high-resolution IUE observations secured over 5 1/2 days in 1989 April. Extensive changes are evident in the absorption regions of Si IV 1393.76, 1402.77A and N IV 1718.55A P Cygni profiles. Both lines exhibit similar patterns of variability, which are characterized by the development and subsequent blueward migration, of discrete absorption components. The formation of four discrete features is identified over about 2.2 days of intensive observations, with a recurrence time of about 15 hr. The time scales, velocities, and accelerations of the progressive absorption enhancements are determined. These changes are accompanied by fluctuations of up to about 200 km/s in the maximum observed blue edge velocities in saturated C IV and N V P Cygni profiles.

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