Detection of radial and non-radial oscillations in MOST photometry of zeta Ophiuchi

Details Detection of radial and non-radial oscillations in MOST photometry of zeta Ophiuchi Detection of radial and non-radial oscillations in MOST photometry of zeta Ophiuchi

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.1408w&link_type=abstract

American Astronomical Society Meeting 205, #14.08; Bulletin of the American Astronomical Society, Vol. 36, p.1361

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

ζ Oph is a rapidly rotating (vsini ˜400 km s-1) O9 III emission-line star with line profile variations characteristic of sectorial, non-radial pulsations. The MOST photometric satellite observed ζ Oph for 23 days from 19 May to 11 June 2004. Half second exposures were taken every ten seconds with a 60% useful duty cycle on each satellite orbit. There are several significant peaks between 1.5 and 7.5 c/d in the frequency spectrum which can be identified with radial and non-radial oscillations, and the stellar rotational period. Pulsations of even higher degree can be seen in the profiles of Hβ and the He I lines which were monitored simultaneously at the Dominion Astrophysical, Gunma, and Ondrejov Observatories.

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