Pulsations Beneath the Winds: Unique Precise Photometry from MOST

Details Pulsations Beneath the Winds: Unique Precise Photometry from MOST Pulsations Beneath the Winds: Unique Precise Photometry from MOST

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..388...29m&link_type=abstract

Mass Loss from Stars and the Evolution of Stellar Clusters ASP Conference Series, Vol. 388, proceedings of the conference held 2

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It has now been three years since the first Canadian space telescope MOST (Microvariability and Oscillations of STars) continues to make its unique mark in stellar asteroseismology, exoplanetology and other studies of high-precision photometric variability. Among massive stars, three OB, three later-type B stars and two Wolf-Rayet stars have been studied so far with unprecedented precision and time coverage in samples with of order 100 000 data points collected without a break over several weeks. Of particular interest are: a first clear pulsation period of P = 9.8h has been found in a WR star (WR123, WN8); no short periods between a minute and an hour have been seen in either of the two WR stars observed (WR123; WR103, WC9d) to the 0.2 mmag level, although these stars both exhibit numerous short-lived oscillations mostly with periods longer than a day, which must be related to stellar pulsations; g-mode pulsations were detected in a blue supergiant; non-radial g-mode pulsations may be excited in all classical Be stars and thus may play a pivotal rôle in the Be-star mass-ejection process. A review of all the massive-star results to date from MOST and their implications are presented.

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