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J/A+A/381/446       Astrometric Radial Velocities. III.      (Madsen+, 2002)

Astrometric Radial Velocities. III. Hipparcos Measurements of nearby star clusters and associations. Madsen S., Dravins D., Lindegren L. <Astron. Astrophys. 381, 446 (2002)> =2002A&A...381..446M
ADC_Keywords: Associations, stellar ; Clusters, open ; Radial velocities ; Velocity dispersion ; Parallaxes, spectroscopic Keywords: methods: data analysis - techniques: radial velocities - astrometry - stars: distances - stars: kinematics - open clusters and associations: general Description: Astrometrically determined kinematic data are given for nearby clusters and associations, including astrometric radial velocities and kinematically improved parallaxes for individual stars. The astrometric radial velocities are determined independent of spectroscopy. Table 1 gives the space velocities and internal velocity dispersions of the clusters and associations. The electronic Table1 (Table1.dat) is an extended version of Table 1 in the journal paper, now including the full covariances of the space velocity components as well as the space motion in spherical coordinates. Table 2 gives the astrometric radial velocities and kinematically improved parallaxes for the individual stars. The electronic Table 2 is an extended version of Table 2 in the journal paper, now including all clusters and associations studied; results using data from both the Hipparcos and Tycho-2catalogues, as well as the standard errors for all deduced quantities. The electronic Table 2 is divided into 10 sub-tables (table1a.dat through table2j.dat), one for each cluster or association. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 204 11 Kinematic data for 11 clusters and associations table2a.dat 68 77 77 stars in the Ursa Major cluster table2b.dat 68 179 179 stars in the Hyades cluster table2c.dat 68 40 40 stars in the Coma Berenices cluster table2d.dat 68 60 60 stars in the Pleiades cluster table2e.dat 68 24 24 stars in the Praesepe cluster table2f.dat 68 179 179 stars in the Lower Centaurus Crux association table2g.dat 68 218 218 stars in the Upper Centaurus Lupus association table2h.dat 68 120 120 stars in the Upper Scorpius association table2i.dat 68 78 78 stars in the Alpha Persei association table2j.dat 68 59 59 stars in the 'HIP 98321' association
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 A1 --- t2 [a-j] indicates which table2 lists the stars 3- 23 A21 --- Name *Name of cluster or association 25- 27 I3 --- Nacc Number of stars accepted in the solution 29- 31 I3 --- Nrej Number of stars rejected in the solution 33- 38 F6.2 km/s v0x *Space velocity component on equatorial X axis 40- 44 F5.2 km/s e_v0x *Standard error in v0x 46- 51 F6.2 km/s v0y *Space velocity component on equatorial Y axis 53- 57 F5.2 km/s e_v0y *Standard error in v0y 59- 64 F6.2 km/s v0z *Space velocity component on equatorial Z axis 66- 70 F5.2 km/s e_v0z *Standard error in v0z 72- 75 F4.2 km/s sigv *Internal velocity dispersion 77- 80 F4.2 km/s e_sigv *Standard error of sigv 82- 86 F5.1 deg RA0deg *Right ascension (J2000) of cluster centroid 88- 92 F5.1 deg DE0deg *Declination (J2000) of cluster centroid 94- 99 F6.2 km/s v0r *Astrometric radial velocity of centroid 101-105 F5.2 km/s e_v0r *Standard error of v0r 107-115 F9.4 km2/s2 cxx *Covariance of (v0x,v0x) 117-125 F9.4 km2/s2 cxy *Covariance of (v0x,v0y) 127-135 F9.4 km2/s2 cxz *Covariance of (v0x,v0z) 137-145 F9.4 km2/s2 cyy *Covariance of (v0y,v0y) 147-155 F9.4 km2/s2 cyz *Covariance of (v0y,v0z) 157-165 F9.4 km2/s2 czz *Covariance of (v0z,v0z) 167-172 F6.2 deg RAcdeg *Right ascension (J2000) of convergence point 174-178 F5.2 deg e_RAcdeg *Standard error of RAc, times cos(DEc) 180-185 F6.2 deg DEcdeg *Declination (J2000) of convergence point 187-191 F5.2 deg e_DEcdeg *Standard error of DEc 193-198 F6.2 km/s v0 *Total space velocity 200-204 F5.2 km/s e_v0 *Standard error of v0
Note on Name: Name of the cluster or association, as it is referred to in the journal paper. The association Scorpius OB2 is the union of the (sub-) associations Lower Centaurus Crux, Upper Centaurus Lupus, and Upper Scorpius. Its entry refers to a solution in which the whole complex is considered as a single association with common space velocity. Note on v0x, v0y, v0z: Equatorial (ICRS) components of the space velocity of the cluster centroid, relative the Solar System barycentre, as obtained in the maximum-likelihood solution using the Nacc stars for which there is a Hipparcos solution in Table 2. Note on e_v0x, e_v0y, e_v0z: Formal standard errors of the space velocity components, as estimated from the maximum-likelihood solution. Apart from rounding errors, these values equal the square roots of cxx, cyy and czz, respectively. Note on sigv, e_sigv: The estimated internal velocity dispersion of the cluster, and its estimated standard error. sigv refers to the standard deviation of each rectangular component of the (assumed isotropic) dispersion. The dispersion and its standard error were estimated as described in Appendix A.4 of Paper II (Lindegren et al., 2000A&A...356.1119L) Note on RA0deg, DE0deg: Equatorial coordinates of the adopted cluster centroid. These were obtained from the unweighted mean rectangular coordinates of the Nacc accepted stars in the cluster. The adopted coordinates were obtained by rounding to the nearest 0.1 deg. For the Ursa Major cluster, only the 13 core stars listed by Soderblom & Mayor (1993, cat. J/AJ/105/226) were used to compute the centroid. Note on v0r, e_v0r: Radial component of the cluster space velocity in the direction (RA0deg, DE0deg) towards the adopted cluster centroid, and its formal standard error. v0r is the astrometric radial velocity of the cluster centroid. e_v0r represents the typical uncertainty in the astrometric radial velocities of individual stars from the uncertainty of the space velocity vector. The total uncertainty of the astrometric radial velocities, as listed in Table 2, includes in addition a contribution from the internal velocity dispersion. Note on cxx, cxy, cxz, cyy, cyz, czz: These are the six non-redundant elements of the 3*3 covariance matrix of the space velocity vector (v0x,v0y,v0z), as obtained in the maximum-likelihood solution. Note on RAcdeg, DEcdeg, v0: Convergent point in equatorial (ICRS) coordinates, and the total space velocity, corresponding to the space velocity vector (v0x,v0y,v0z). This is just an alternative (spherical) specification of the space velocity vector. Note on e_RAcdeg, e_DEcdeg, e_v0: Standard errors of the convergent point coordinates and total velocity. These were obtained by the normal error propagation formulae, assuming the given covariance of (v0x,v0y,v0z). The error in right ascension, e_RAcdeg, is expressed as a true arc, i.e. it includes the factor cos(DEc).
Byte-by-byte Description of file: table2?.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP * Hipparcos catalogue number 8- 19 A12 --- Alt * Alternate catalogue number (HD, or other) 21- 26 F6.2 km/s vrH *? Astrometric radial velocity from Hipparcos 28- 32 F5.2 km/s e_vrH *? Standard error in vrH 34- 39 F6.2 km/s vrT *? Astrometric radial velocity from Tycho-2 41- 44 F4.2 km/s e_vrT *? Standard error in vrT 46- 51 F6.2 mas piH *? Kinematically improved parallax from Hipparcos 53- 56 F4.2 mas e_piH *? Standard error in piH 58- 62 F5.2 mas piT *? Kinematically improved parallax from Tycho-2 64- 67 F4.2 mas e_piT *? Standard error in piT
Note on HIP: Catalogue number of the star in the Hipparcos Catalogue (ESA 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200 = Cat. I/239) Note on Alt: Alternate identification number for the same star. If only a number is given, that is the HD number (in the range 1-225300) or of its extension HDE (range 225301-359083). For stars without an HD/HDE number, the entry is either the Bonner, Cordoba, or Cape Photographic Durchmusterung (BD, CoD, or CPD), and when that is lacking, the Melotte number (Mel) for stars in the Hyades, Pleiades, and Alpha Persei; the entry in The Catalogue of Nearby Stars (GL; Gliese 1969VeARI..22....1G, Cat. V/35), or its extensions (GJ; Gliese & Jahreiss 1979A&AS...38..423G, See Cat. V/70); The Lowell Proper Motion Survey (G; Giclas et al., 1959-78, Cat. I/79 & I/112); or The Luyten Palomar Survey (LP; Luyten 1963-87). These identifiers were taken from The Hipparcos Input Catalogue (ESA SP-1136, 1992 = Cat. I/196), in that version that is on the Celestia 2000 CD-ROM (Turon et al., ESA SP-1220, 1998). Note on vrH, e_vrH: Estimated astrometric radial velocities and their standard errors obtained from the kinematic solution using astrometric data from the Hipparcos main catalogue. These were derived from Eqs.(2) and (3) in the paper, using the adopted solution in Table 1. The sample of stars producing this astrometric solution is made up of those with an entry in these columns; stars with a blank entry were rejected by the programme routines selecting the optimal sample. The LaTeX code used in the paper for vrH is $v_r,Hip$, and that for e_vrH is $ε(v_r,Hip)$. Note on vrT, e_vrT: Estimated astrometric radial velocities and their standard errors obtained from the kinematic solution using astrometric data from the Tycho-2 catalogue. This catalogue includes almost a century of ground-based proper- motion data, and yields values slightly different from the previous ones. For the Hyades, the resulting optimal sample of stars was slightly different from that for the Hipparcos main catalogue (the stars producing the solution are those with an entry in the respective columns). Solutions with Tycho-2 data were not computed for all clusters. Note on piH, e_piH: Kinematically improved parallaxes and their standard errors (in milli- arcseconds, mas) obtained from the kinematic solution, using astrometric data from the Hipparcos main catalogue. The LaTeX code used in the paper for piH is $π_Hip$, and that for e_piH is $ε(π_Hip)$. Note on piT, e_piT: Kinematically improved parallaxes and their standard errors obtained from the kinematic solution, using astrometric data from the Tycho-2 catalogue. Analogous to the case for radial velocities, there are slight differences between the Hipparcos and Tycho-2 solutions. Solutions with Tycho-2 data were not computed for all clusters.
Acknowledgements: Soren Madsen References: Dravins et al., Paper I 1999A&A...348.1040D Lindegren et al., Paper II 2000A&A...356.1119L
(End) Patricia Bauer [CDS] 22-Oct-2001
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