Search catalogue
J/A+AS/126/21 Velocities and duplicity of F-type dwarfs (Nordstroem+ 1997)
Radial velocities, rotations, and duplicity of a sample of early F-type dwarfs Nordstroem B., Stefanik R.P., Latham D.W., Andersen J. <Astron. Astrophys. Suppl. Ser. 126, 21 (1997)> =1997A&AS..126...21N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, dwarfs ; Rotational velocities ; Radial velocities Keywords: methods: statistical - techniques: radial velocities - stars: binaries: spectroscopic - stars: kinematics - Galaxy: solar neighbourhood 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. 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 112 530 Mean radial velocities, mean errors, and variability indicators for 530 stars with single-lined spectra table2 88 65 Mean radial velocities, luminosity ratios, and other derived parameters for 65 stars with double-lined or composite spectra table4 8 73 List of stars which rotate too rapidly for usable radial-velocity measurements with the CfA instruments table5 101 2130 Individual radial-velocity observations for the single-lined stars table6 99 746 Individual radial-velocity observations for the double-lined stars
Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number of single-lined star 7- 8 A2 --- m_HD Visual binary component code 10- 11 I2 h RAh Right ascension (J2000) 13- 14 I2 min RAm Right ascension (J2000) 16- 19 F4.1 s RAs Right ascension (J2000) 21 A1 --- DE- Declination sign 22- 23 I2 deg DEd Declination (J2000) 25- 26 I2 arcmin DEm Declination (J2000) 28- 29 I2 arcsec DEs Declination (J2000) 31- 34 I4 K Teff Effective temperature (Template spectrum parameter) 36- 37 I2 [mm/s2] logg Surface gravity (Template spectrum parameter) 39- 43 F5.1 km/s Vrot Estimated rotational velocity, v sin i 46- 47 I2 --- Nobs Number of observations 49- 52 I4 d Span Time span from first to last observation 54- 59 F6.2 km/s <RV> Mean radial velocity 61- 65 F5.2 km/s e_<RV> Mean error of mean radial velocity 67- 71 F5.2 km/s sigExt Standard deviation (external error) of the individual radial velocity observations 73- 76 F4.2 km/s sigInt Expected average (internal) error of a single radial velocity as computed by XCSAO 78- 82 F5.2 --- sigExt/sigInt Ratio of external to internal errors 84- 91 F8.2 --- chi2 Chi-square of the data set for this star 93-100 F8.6 % P(chi2) Probability that chi^2 is due to observational errors of a true constant-velocity object 102-106 F5.2 --- <R> Average goodness-of-fit parameter R, from XCSAO 108-112 F5.3 --- <height> Average correlation height, from XCSAO
Byte-by-byte Description of file: table2
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number of double-lined star 7 A1 --- m_HD Visual binary component code 9- 10 I2 h RAh Right ascension (J2000) 12- 13 I2 min RAm Right ascension (J2000) 15- 18 F4.1 s RAs Right ascension (J2000) 20 A1 --- DE- Declination sign 21- 22 I2 deg DEd Declination (J2000) 24- 25 I2 arcmin DEm Declination (J2000) 27- 28 I2 arcsec DEs Declination (J2000) 30- 33 I4 K Teff1 ? Synthetic template spectrum effective temperature, for component 1 in spectrum 35- 37 I3 km/s Vrot1 ? Synthetic template spectrum rotational velocity, for component 1 in spectrum 39- 42 I4 K Teff2 Synthetic template spectrum effective temperature, for component 2 in spectrum 44- 46 I3 km/s Vrot2 Synthetic template spectrum rotational velocity, for component 2 in spectrum 48- 51 F4.2 --- Alpha ? Luminosity ratio (comp2/comp1) computed with TODCOR (see text) 53- 54 I2 --- Nobs Number of observations 56- 61 F6.2 km/s <V0> Mean (systemic) radial velocity, V0 63- 66 F4.2 km/s e_<V0> Mean error of mean radial velocity 68- 71 I4 d Span Time span from first to last observation 73- 77 F5.3 --- q ? Mass ratio q (comp2/comp1) when available; see paper for methods of computation 79- 83 F5.3 --- e_q ? Mean error of mass ratio 85- 88 A4 --- Rem Remark on nature of system (1)
Note (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
Byte-by-byte Description of file: table4
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number, for fast-rotating stars not measurable with the current CfA instruments 7- 8 A2 --- m_HD Visual binary component code
Byte-by-byte Description of file: table5
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number, as in table1 7- 9 A3 --- m_HD Visual binary component code 11- 12 I2 h RAh Right ascension (J2000) 14- 15 I2 min RAm Right ascension (J2000) 17- 20 F4.1 s RAs Right ascension (J2000) 22 A1 --- DE- Declination sign 23- 24 I2 deg DEd Declination (J2000) 26- 27 I2 arcmin DEm Declination (J2000) 29- 30 I2 arcsec DEs Declination (J2000) 32 A1 --- Tel [WTM] Observatory code (1) 34- 38 I5 --- Obs Serial number of observation 40- 47 A8 --- Star Associated star identification to serial number of observation 50- 51 I2 [Sun] log[Fe/H] Metal abundance (always solar = 00 here) 53- 56 I4 K Teff Effective temperature (Template spectrum parameter) 58- 59 I2 [mm/s2] logg Surface gravity (Template spectrum parameter) 61- 63 I3 km/s Vrot Value of vsini selected for the star (Template spectrum parameter) 65- 77 F13.5 d HJD Heliocentric Julian Date of observation 79- 84 F6.2 km/s RV Radial velocity 86- 90 F5.2 km/s e_RV Mean error of radial velocity as computed by XCSAO 92- 96 F5.2 ---- R Goodness-of-fit parameter R, from XCSAO 98-101 F4.2 --- height Correlation peak height, from XCSAO
Note (1): "W": 1.5m Wyeth; "T": 1.5m Tillinghast; "M": MMT 4.2m telescope
Byte-by-byte Description of file: table6
Bytes Format Units Label Explanations
1- 6 I6 --- HD HD number, as in table2 7 A1 --- m_HD Visual binary component code 9- 10 I2 h RAh Right ascension (J2000) 12- 13 I2 min RAm Right ascension (J2000) 15- 18 F4.1 s RAs Right ascension (J2000) 20 A1 --- DE- Declination sign 21- 22 I2 deg DEd Declination (J2000) 24- 25 I2 arcmin DEm Declination (J2000) 27- 28 I2 arcsec DEs Declination (J2000) 30- 33 I4 K Teff1 Synthetic template spectrum effective temperature for component 1 in spectrum 35- 37 I3 km/s Vrot1 Synthetic template spectrum rotational velocity for component 1 in spectrum 39- 42 I4 K Teff2 Synthetic template spectrum effective temperature for component 2 in spectrum 44- 46 I3 km/s Vrot2 Synthetic template spectrum rotational velocity for component 1 in spectrum 48- 51 F4.2 --- Alpha ? Continuum ratio alpha (comp2/comp1) specified to TODCOR when fixed for all observations 52 A1 --- n_Alpha [f] f if continuum ratio alpha (comp2/comp1) was determined by TODCOR for each observation 54- 65 F12.4 d HJD Heliocentric Julian Date of observation 67- 73 F7.2 km/s RV1 Radial velocity of component 1 75- 81 F7.2 km/s RV2 Radial velocity of component 2 83- 87 F5.3 --- L2/L1 Luminosity ratio (comp2/comp1), see above 89- 93 F5.3 --- height Correlation peak height, from TODCOR 95- 97 I3 --- Obs Running number of observation
Acknowledgements: Johannes Andersen References: Nordstrom B. et al., 1994A&A...287..338N Zucker S., Mazeh T., 1994ApJ...420..806Z
(End) Patricia Bauer [CDS] 13-Jun-1997
| The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line |
© UDS/CNRS
← Click to display the menu