Shortterm Line-Profile Variations and Episodic Mass Loss in the Be-Star Zeta-Ophiuchi

Details Shortterm Line-Profile Variations and Episodic Mass Loss in the Be-Star Zeta-Ophiuchi Shortterm Line-Profile Variations and Episodic Mass Loss in the Be-Star Zeta-Ophiuchi

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...273..435k&link_type=abstract

Astronomy and Astrophysics, Vol.273, NO. 2/JUNII, P. 435, 1993

Astronomy and Astrophysics

Astrophysics

40

Stars: Early-Type Star, Be, Oscillations, Individual (Ζ Oph), Lines: Profile

Scientific paper

High-resolution spectra have been obtained for the rapidly rotating early-type star ζ Oph at three epochs in 1990, covering its recent emission episode. We found that at least two nonradial pulsation modes have been excited; an l = -m = 4 mode with a period of 3.33h and an l = -m = 7 mode with period 2.43 h, if they are assumed to be sectoral modes. These modes are identical to those found in our previous observations from 1987 to 1989. Models other than nonradial pulsation to explain the origin of the line-profile variations are critically discussed.
No significant change of the rotational velocity has been detected throughout our observations. The time scale of the acceleration of the equatorial region by the observed nonradial pulsations is estimated and is shown to correspond to the Be-type quasi-periodic mass loss cycle in the star.
A correlation between amplitudes of line-profile variations and mass loss indication might be seen in this star. The amplitude of line-profile variations are larger around the emission episode, and decreased at the end of the emission episode. This suggests a connection between line-profile variations and episodic mass loss in this star.

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