Access to Astronomical Catalogues

← Click to display the menu
J/A+A/423/517   Velocities of Galactic disk late-type stars (Rocha-Pinto+, 2004)

Chemical enrichment and star formation in the Milky Way disk. III. Chemodynamical constraints. Rocha-Pinto H.J., Flynn C., Hanninen J., Scalo J., Maciel W.J., Hensler G. <Astron. Astrophys. 423, 517 (2004)> =2004A&A...423..517R
ADC_Keywords: Stars, late-type ; Space velocities ; Radial velocities Keywords: stars: late-type - stars: statistics - Galaxy: evolution - Galaxy: solar neighbourhood Abstract: In this paper, we investigate some chemokinematical properties of the Milky Way disk, by using a sample composed by 424 late-type dwarfs. We show that the velocity dispersion of a stellar group increases steadily the age of the stellar group, according to a disk heating law proportional to t0.26, where t is the age of the stellar group. The temporal evolution of the vertex deviation is considered in detail. It is shown that the vertex deviation does not follow a smooth variation with time. Previous studies in the literature seem to not have found it due to the use of statistical ages for stellar groups, rather than individual ages. The possibility to use the orbital parameters of a star to derive information about its birthplace is investigated, and we show that the mean galactocentric radius is likely to be the most reliable stellar birthplace indicator. However, this information cannot be used presently to derive radial evolutionary constraints, due to an intrinsic bias present in all samples constructed from nearby stars. Description: Chemokinematical parameters for 424 solar neighbourhood late-type dwarfs. For each star, we give the HD number (or BD number), the chromospheric index log R'HK, the chromospheric age and photometric metallicity, the peculiar velocities U, V and W w.r.t. the LSR and their their respective errors e_U, e_V and e_W, the orbital parameters Rm (average galactocentric radius), Rp (perigalactic radius), Zmax (maximum height above the plane) and e (eccentricity). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 80 424 Chemokinematical parameters for 424 stars
See also: J/AJ/118/895 : Milky way and stellar distributions (Tiede+ 1999) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name HD or BD designation 12- 16 F5.2 --- logR'HK Chromospheric activity index (G1) 18- 22 F5.2 [Sun] [Fe/H] Stellar photometric metallicity 24- 29 F6.1 km/s RV Radial velocity 31- 35 F5.2 Gyr Age Stellar chromospheric age 37- 40 I4 km/s Uvel U velocity component w.r.t the LSR 42- 45 I4 km/s Vvel V velocity component w.r.t the LSR 47- 50 I4 km/s Wvel W velocity component w.r.t the LSR 52- 53 I2 km/s e_Uvel Error in U velocity 55- 56 I2 km/s e_Vvel Error in V velocity 58- 59 I2 km/s e_Wvel Error in W velocity 61- 65 F5.2 kpc Rm ? Average orbital galactocentric radius 67- 70 F4.2 kpc Rp ? Perigalacticon galactocentric radius 72- 75 F4.2 kpc Zmax ? Maximum heigh above the Galactic plane 77- 80 F4.2 --- ecc ? Orbital eccentricity
Global Notes: Note (G1): the chromospehric index is defined as the flux ratio of CaII in emission to the bolometric flux of the photosphere
Acknowledgements: Walter Maciel References: Rocha-Pinto et al., Paper I 2000A&A...358..850R Rocha-Pinto et al., Paper II 2000A&A...358..869R
(End) Patricia Vannier [CDS] 28-Jun-2004
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

catalogue service

© UDS/CNRS

Contact