J/A+AS/126/21 J/A+AS/126/21 Velocities and duplicity of F-type dwarfs B Nordstroem R P Stefanik D W Latham J Andersen Astron. Astrophys. Suppl. Ser. 126 21 1997 1997A&AS..126...21N Radial velocities Rotational velocities Stars, dwarfs binaries: spectroscopic methods: statistical solar neighborhood stars: kinematics techniques: radial velocities 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. vsini>120km/s). 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.

HD HD number of single-lined star --- m_HD Visual binary component code --- RAh Right ascension (J2000) h RAm Right ascension (J2000) min RAs Right ascension (J2000) s DE- Declination sign --- DEd Declination (J2000) deg DEm Declination (J2000) arcmin DEs Declination (J2000) arcsec Teff Effective temperature (Template spectrum parameter) K logg Surface gravity (Template spectrum parameter) [mm/s2] Vrot Estimated rotational velocity, v sin i km/s Nobs Number of observations --- Span Time span from first to last observation d <RV> Mean radial velocity km/s e_<RV> Mean error of mean radial velocity km/s sigExt Standard deviation (external error) of the individual radial velocity observations km/s sigInt Expected average (internal) error of a single radial velocity as computed by XCSAO km/s sigExt/sigInt Ratio of external to internal errors --- chi2 Chi-square of the data set for this star --- P(chi2) Probability that chi^2 is due to observational errors of a true constant-velocity object % <R> Average goodness-of-fit parameter R, from XCSAO --- <height> Average correlation height, from XCSAO --- HD HD number of double-lined star --- m_HD Visual binary component code --- RAh Right ascension (J2000) h RAm Right ascension (J2000) min RAs Right ascension (J2000) s DE- Declination sign --- DEd Declination (J2000) deg DEm Declination (J2000) arcmin DEs Declination (J2000) arcsec Teff1 Synthetic template spectrum effective temperature, for component 1 in spectrum K Vrot1 Synthetic template spectrum rotational velocity, for component 1 in spectrum km/s Teff2 Synthetic template spectrum effective temperature, for component 2 in spectrum K Vrot2 Synthetic template spectrum rotational velocity, for component 2 in spectrum km/s Alpha Luminosity ratio (comp2/comp1) computed with TODCOR (see text) --- Nobs Number of observations --- <V0> Mean (systemic) radial velocity, V0 km/s e_<V0> Mean error of mean radial velocity km/s Span Time span from first to last observation d q Mass ratio q (comp2/comp1) when available; see paper for methods of computation --- e_q Mean error of mass ratio --- Rem Remark on nature of system number=1 SB2/3 indicates no. of components detected; O: preliminary single- or double-lined orbit computed (see Table 3 and Figure 2); W: V0 and q computed by Wilson's (1941ApJ....93...29W) method; C: velocities constant during period of observation --- HD HD number, for fast-rotating stars not measurable with the current CfA instruments --- m_HD Visual binary component code --- HD HD number, as in table1 --- m_HD Visual binary component code --- RAh Right ascension (J2000) h RAm Right ascension (J2000) min RAs Right ascension (J2000) s DE- Declination sign --- DEd Declination (J2000) deg DEm Declination (J2000) arcmin DEs Declination (J2000) arcsec Tel Observatory code number=1 "W": 1.5m Wyeth; "T": 1.5m Tillinghast; "M": MMT 4.2m telescope --- Obs Serial number of observation --- Star Associated star identification to serial number of observation --- log[Fe/H] Metal abundance (always solar = 00 here) [Sun] Teff Effective temperature (Template spectrum parameter) K logg Surface gravity (Template spectrum parameter) [mm/s2] Vrot Value of vsini selected for the star (Template spectrum parameter) km/s HJD Heliocentric Julian Date of observation d RV Radial velocity km/s e_RV Mean error of radial velocity as computed by XCSAO km/s R Goodness-of-fit parameter R, from XCSAO ---- height Correlation peak height, from XCSAO --- HD HD number, as in table2 --- m_HD Visual binary component code --- RAh Right ascension (J2000) h RAm Right ascension (J2000) min RAs Right ascension (J2000) s DE- Declination sign --- DEd Declination (J2000) deg DEm Declination (J2000) arcmin DEs Declination (J2000) arcsec Teff1 Synthetic template spectrum effective temperature for component 1 in spectrum K Vrot1 Synthetic template spectrum rotational velocity for component 1 in spectrum km/s Teff2 Synthetic template spectrum effective temperature for component 2 in spectrum K Vrot2 Synthetic template spectrum rotational velocity for component 1 in spectrum km/s Alpha Continuum ratio alpha (comp2/comp1) specified to TODCOR when fixed for all observations --- n_Alpha f if continuum ratio alpha (comp2/comp1) was determined by TODCOR for each observation --- HJD Heliocentric Julian Date of observation d RV1 Radial velocity of component 1 km/s RV2 Radial velocity of component 2 km/s L2/L1 Luminosity ratio (comp2/comp1), see above --- height Correlation peak height, from TODCOR --- Obs Running number of observation --- Patricia Bauer CDS 1997Jun13Johannes Andersen <ja@ursa.astro.ku.dk> J_A+AS_126_21.xml