The nature of the F STR 4077-A stars. II - Frequency, kinematics, metallicity, binarity and rotational velocities

Details The nature of the F STR 4077-A stars. II - Frequency, kinematics, metallicity, binarity and rotational velocities The nature of the F STR 4077-A stars. II - Frequency, kinematics, metallicity, binarity and rotational velocities

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..335n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 335-350. SNSF-supported research.

Astronomy and Astrophysics

Astrophysics

21

Astronomical Photometry, F Stars, Metallicity, Peculiar Stars, Stellar Atmospheres, Stellar Rotation, Binary Stars, Giant Stars, Hertzsprung-Russell Diagram, Metallic Stars, Stellar Composition

Scientific paper

Fundamental characteristics of the F str 4077-A stars are investigated. Their frequency in the solar neighborhood is estimated at about 1.4 percent of all main-sequence F stars. The space velocities are consistent with Population I membership, with the exception of one object (in a sample of 17) whose velocity is above 100 km/s. The binary frequency is higher than normal, and the rotational velocities are normal for the cooler stars but rather low for the hotter ones. Overall metallicity, deduced from photometric and CORAVEL data, suggests a division of these stars into two groups: metal-rich objects (generally the hotter ones), which may resemble the Am or Ap stars, and slightly metal-weak objects (generally the cooler ones), which may be linked with the Ba II giants or the CH subgiants.

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