Time series observations of O stars. I - IUE observations of variability in the stellar wind of Zeta Puppis

Details Time series observations of O stars. I - IUE observations of variability in the stellar wind of Zeta Puppis Time series observations of O stars. I - IUE observations of variability in the stellar wind of Zeta Puppis

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390..266p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 1, May 1, 1992, p. 266-272. Research supported by Royal Society, U

Astronomy and Astrophysics

Astronomy

42

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

Scientific paper

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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