Radial velocities, rotations, and duplicity of a sample of early F-type dwarfs
Abstract
We present new radial and rotational velocities for 595 nearby early F dwarfs, based on digital spectra cross-correlated with individually optimised synthetic template spectra. The selection of optimum templates, the determination of rotational velocities, and the extraction of velocities from the blended spectra of double-lined spectroscopic binaries are discussed in some detail. We find 170 spectroscopic binaries in the sample and determine orbits for 18 double-lined and 2 single-lined binaries, including some spectroscopic triples. 73 stars are listed with too rapid rotation to yield useful radial velocities (i.e. v sin i > 120 km~s^-1). We discuss the binary frequency in the sample, and the influence of unrecognised binaries on the definition of clean metallicity groups of young F dwarfs and the determination of their kinematical properties. Tables 1, 5 and 6 are only available, and Tables 2-4 also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html.
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- November 1997
- DOI:
- 10.1051/aas:1997248
- Bibcode:
- 1997A&AS..126...21N
- Keywords:
-
- METHODS: STATISTICAL;
- TECHNIQUES: RADIAL VELOCITIES;
- STARS: BINARIES: SPECTROSCOPIC;
- STARS: KINEMATICS;
- GALAXY: SOLAR NEIGHBOURHOOD