The incidence of nonradial pulsation in the lambda Bootis stars

Details The incidence of nonradial pulsation in the lambda Bootis stars The incidence of nonradial pulsation in the lambda Bootis stars

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...350..553b&link_type=abstract

Astronomy and Astrophysics, v.350, p.553-565 (1999)

Astronomy and Astrophysics

Astrophysics

17

Stars: Oscillations, Stars: Peculiar, Stars: Variables: General

Scientific paper

We have conducted a high-resolution, high signal-to-noise spectroscopic survey of the members of the peculiar lambda Boo stars accessible from the Canada-France-Hawaii Telescope to investigate the incidence of high-degree nonradial pulsation (NRP) in these metal-deficient stars. Of 16 objects observed more than once, 9 show conclusive evidence of such NRP, which confirms that pulsational instability is a common phenomenon in the lambda Boo class. The widespread presence of NRP in the lambda Boo stars indirectly supports the accretion/diffusion scenario for the formation of these objects, but unfortunately does not rule out other possible causes for the phenomena. However, extensive time-series photometry and spectroscopy of several particularly interesting pulsating members of the class noted here should provide asteroseismologists with the eigenfrequency data needed to resolve the current debate concerning the evolutionary status, and hence, the origin of these peculiar stars. From our survey, we also identify a set of four stars, including lambda Boo itself, with similar fundamental parameters but remarkably different pulsation characteristic. These stars may offer vital clues as to the physical excitation of lambda Boo pulsations. Figs.\,2--5, 7--10 are only available in the electronic version.

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