HR 8799: A Link between γ Doradus Variables and λ Bootis Stars

Details HR 8799: A Link between γ Doradus Variables and λ Bootis Stars HR 8799: A Link between γ Doradus Variables and λ Bootis Stars

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118.2993g&link_type=abstract

The Astronomical Journal, Volume 118, Issue 6, pp. 2993-2996.

Other

44

Stars: Abundances, Stars: Chemically Peculiar, Stars: Individual (Hr 8799), Stars: Variables: Other

Scientific paper

On the basis of a new classification-resolution spectrum, we find that HR 8799, a known member of the newly discovered γ Doradus variable star class, is a λ Bootis star. Spectral synthesis, in conjunction with fluxes from visible spectrophotometry and the TD-1 satellite, yields Teff=7430 K, logg=4.35, microturbulent velocity ξt=2.7 km s-1, and metallicity [M/H]=-0.47 for HR 8799, confirming its metal-weak nature. HR 8799 is also a ``Vega-like'' star in that it shows excess flux at 60 μm, probably due to a circumstellar dust shell or disk. Thus, this star links three astrophysically interesting classes of stars and may provide potentially important constraints on the physics of, and the interconnections between, the λ Bootis phenomenon and the γ Doradus pulsation phenomenon.

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