Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452l..65h&link_type=abstract
Astrophysical Journal Letters v.452, p.L65
Astronomy and Astrophysics
Astronomy
49
Stars: Early-Type, Stars: Individual Henry Draper Number: Hd 66811, Stars: Mass Loss, Ultraviolet: Stars
Scientific paper
We discuss 16 days of intensive IUE observations of the Si IV doublet ( lambda 1400) in the spectrum of the O4 I(n)f star zeta Pup. The data show continuous variability throughout the greater part of the blueshifted absorption. Time series analysis of these data reveals significant power at periods of 19.2 hr and 5.2 days, which we identify with the mean recurrence time of "discrete absorption components" (DACs) and the photospheric rotation period, respectively. These results indicate that the wind has a global longitudinal asymmetry (approaching a factor 2 in optical depth), possibly associated with large-scale magnetic structures, but suggest that the DACs are not directly associated with specific stellar longitudes in this star. There is no significant power in the lines at the 8.5 hr period identified in photospheric absorption-line variability, nor at the 16.7 hr period reported in X-ray observations.
Howarth Ian D.
Massa Derck
Prinja Raman K.
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