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V/130  Geneva-Copenhagen Survey of Solar neighbourhood III   (Holmberg+, 2009)

The Geneva-Copenhagen survey of the Solar neighbourhood III Holmberg J., Nordstrom B., Andersen J. <Astron. Astrophys. 501, 941 (2009)> =2009A&A...501..941H
ADC_Keywords: Stars, F-type; Stars, G-type; Positional data ; Photometry, uvby; Radial velocities ; Stars, ages ; Stars, distances ; Space velocities ; Keywords: Galaxy: disk - Galaxy: solar neighbourhood - Galaxy: stellar content Galaxy: kinematics and dynamics - Galaxy: evolution - Stars: fundamental parameters Abstract: Ages, chemical compositions, velocity vectors, and Galactic orbits for stars in the solar neighbourhood are fundamental test data for models of Galactic evolution. The Geneva-Copenhagen Survey of the Solar neighbourhood (Nordstrom et al. 2004A&A...418..989N; GCS), a magnitude-complete, kinematically unbiased sample of 16,682 nearby F and G dwarfs, is the largest available sample with complete data for stars with ages spanning that of the disk. We aim to improve the accuracy of the GCS data by implementing the recent revision of the Hipparcos parallaxes. The new parallaxes yield improved astrometric distances for 12,506 stars in the GCS. We also use the parallaxes to verify the distance calibration for uvbyHbeta photometry by Holmberg et al. (2007A&A...475..519H; GCS II, Cat. VI/117). We add new selection criteria to exclude evolved cool stars giving unreliable results and derive distances for 3,580 stars with large parallax errors or not observed by Hipparcos. We also check the GCS II scales of Teff and [Fe/H] and find no need for change. From the new distances we compute revised Mv, U, V, W, and Galactic orbital parameters for 13,520 GCS stars. We also recompute stellar ages with the new values of Mv from the Padova stellar evolution models used in GCS I-II, and compare them with ages from the Yale-Yonsei and Victoria-Regina models. Finally, we compare the observed age-velocity relation in W with three simulated disk heating scenarios to show the potential of the data. With these revisions, the basic data for the GCS stars should now be as reliable as is possible with existing techniques. Further improvement must await consolidation of the Teff scale from angular diameters and fluxes, and the Gaia trigonometric parallaxes. We discuss the conditions for improving computed stellar ages from new input data, and for distinguishing different disk heating scenarios from data sets of the size and precision of the GCS. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file newcat3e.dat 146 16682 Main Geneva-Copenhagen catalogue data uvby.dat 51 16682 uvby data used (from Olsen 1984A&AS...57..443O) mratios.dat 23 510 *Mass ratios for doubled-lined binaries
Note on mratios.dat: unchanged table2 of Paper I (Nordstrom et al. 2004A&A...418..989N, Cat. V/117)
See also: I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007) J/A+A/329/943 : F + G solar neighbourhood stars new ages (Ng+ 1998) J/A+A/377/911 : Age-metallicity relation in solar neighbourhood (Feltzing+, 2001) J/A+A/394/927 : Age-metallicity relation for nearby stars (Ibukiyama+, 2002) J/MNRAS/325/1365 : Solar neighbourhood metallicity distribution (Haywood+ 2001) Byte-by-byte Description of file: newcat3e.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP ? Hipparcos number if available 8- 18 A11 --- Name Object name (HD, BD, CD or CP) (1) 20- 23 A4 --- m_Name Components included in photometry (2) 25 A1 --- fb Flag for binaries of all types (3) 27 A1 --- fc Flag for stars in clusters (4) 29- 30 I2 h RAh Right ascension (ICRF) 32- 33 I2 min RAm Right ascension (ICRF) 35- 38 F4.1 s RAs Right ascension (ICRF) 40 A1 --- DE- Declination sign (ICRF) 41- 42 I2 deg DEd Declination (ICRF) 44- 45 I2 arcmin DEm Declination (ICRF) 47- 48 I2 arcsec DEs Declination (ICRF) 50- 54 F5.1 mas plx ? Revised Hipparcos parallax 56- 59 F4.1 mas e_plx ? Standard error of parallax 61- 65 F5.3 [K] logTe ? Effective temperature 67- 71 F5.2 [Sun] [Fe/H] ? Metallicity 73- 76 I4 pc Dist ? Distance 78- 82 F5.2 mag VMag ? Absolute magnitude 84- 87 F4.2 mag e_VMag ? Standard error of Absolute magnitude (5) 89- 92 F4.1 Gyr age ? Age, in Gigayears 94- 97 F4.1 Gyr clage ? Lower confidence limit on age 99-102 F4.1 Gyr chage ? Upper confidence limit on age 104-108 I5 km/s UVel ? Heliocentric space velocity component U (6) 110-114 I5 km/s VVel ? Heliocentric space velocity component V (6) 116-120 I5 km/s WVel ? Heliocentric space velocity component W (6) 122-127 F6.2 kpc Rmin ? Perigalactic distance 129-134 F6.2 kpc Rmax ? Apogalactic distance 136-139 F4.2 --- ecc ? Eccentricity of galactic orbit 141-146 F6.2 kpc zmax ? Maximum distance from galactic plane
Note (1): Object name given in order of preference. A second number following a slash indicates that a double star with separate HD numbers has been observed together. Note (2): If the star is a member of a multiple system the component(s) included in the photometry are identified here. Note (3): This flag identifies confirmed and suspected binaries. The information can come from one or several sources such as photometry, radial velocity or astrometry. Note (4): This flag identifies stars in the Hyades and Coma open clusters. The photometry may be on a different system than the rest of the catalogue. Some stars have had their photometry replaced by standard values, this is marked with a 2, others have NOT have their photometry replaced and are marked with a 1. Note (5): Source for the distance and absolute magnitude: If a revised Hipparcos distance with relative error below 13% is available, this is used, otherwise a photometric distance is used. An error below 0.28 is based on a revised Hipparcos parallax, an error of 0.28 is based on the photometric parallax Note (6): Heliocentric space velocity components given in a right handed coordinate system with U towards the galactic centre.
Byte-by-byte Description of file: uvby.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP ? Hipparcos number, as in newcat3e 8- 18 A11 --- Name Star name, as in newcat3e (HD, BD, CD, CPD) 20- 23 A4 --- m_Name Components included in photometry 25- 30 F6.3 mag Vmag Visual magnitude 32- 37 F6.3 mag b-y Stroemgren (b-y) index 39- 44 F6.3 mag m1 Stroemgren m1 index ((v-b) - (b-y)) 46- 51 F6.3 mag c1 Stroemgren c1 index ((u-v) - (v-b))
Byte-by-byte Description of file: mratios.dat
Bytes Format Units Label Explanations
1- 11 A11 -- Name HD number 13- 17 F5.3 -- mratio Mass ratio (1) 19- 23 F5.3 -- e_mratio ? Estimated uncertainty of the mass ratio (1)
Note (1): For spectroscopic binaries with multiple observations containing double correlation peaks, the centre-of-mass velocity and the mass ratio of the binary may be computed by the method of Wilson (1941ApJ....93...29W). If only two observations are available, no uncertainty can be estimated.
Acknowledgements: Johan Holmberg (johan, astro, ku, dk) Birgitta Nordstrom (birgitta, astro, ku, dk) Johannes Andersen (ja, astro, ku, dk)
(End) Birgitta Nordstrom [Niels Bohr Inst] Francois Ochsenbein [CDS] 23-Jul-2009
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

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