Spectroscopy of Early F Stars: γ Doradus Candidates and Possible Metallic Shell Stars

Details Spectroscopy of Early F Stars: γ Doradus Candidates and Possible Metallic Shell Stars Spectroscopy of Early F Stars: γ Doradus Candidates and Possible Metallic Shell Stars

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....125.2196f&link_type=abstract

The Astronomical Journal, Volume 125, Issue 4, pp. 2196-2214.

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22

Stars: Binaries: General, Stars: Circumstellar Matter, Stars: Fundamental Parameters, Stars: Variables: Other

Scientific paper

We obtained high-resolution spectroscopic observations of 34 γ Doradus candidates. From the red-wavelength spectra, we determined spectral classes, radial velocities, and projected rotational velocities. The spectra of seven late A or early F stars show metallic lines that have composite profiles consisting of a narrow component near the center of a broad line, indicating that they may be shell stars or binaries. Several stars, including HD 152896, HD 173977, HD 175337, and HD 195068/9, show large line profile asymmetries. Two stars, HD 11443 (=α Trianguli) and HD 149420, are ellipsoidal variables and not γ Doradus stars. The percentage of binary systems in our sample may be as high as 74%.

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