Access to Astronomical Catalogues

← Click to display the menu
J/A+A/531/A92       Deep all-sky census of the Hyades        (Roeser+, 2011)

A deep all-sky census of the Hyades. Roeser S., Schilbach E., Piskunov A.E., Kharchenko N.V., Scholz R.-D. <Astron. Astrophys. 531, A92 (2011)> =2011A&A...531A..92R
ADC_Keywords: Clusters, open ; Photometry, UBV ; Photometry, infrared ; Proper motions ; Radial velocities Keywords: open clusters and associations: individual: Hyades - stars: luminosity function, mass function - Hertzsprung-Russell and C-M diagrams Abstract: On the basis of the PPMXL catalogue we perform an all-sky census of the Hyades down to masses of about 0.2M in a region up to 30pc from the cluster centre. We use the proper motions from PPMXL in the convergent point method to determine probable kinematic members. From 2MASS photometry and CMC14 r'-band photometry, we derive empirical colour-absolute magnitude diagrams and, finally, determine photometric membership for all kinematic candidates. This is the first deep (r'<17) all-sky survey of the Hyades allowing a full three-dimensional analysis of the cluster. The survey is complete down to at least M{Ks}=7.3 or 0.25M. We find 724 stellar systems co-moving with the bulk Hyades space velocity, which represent a total mass of 435M. The tidal radius is about 9pc, and 275M (364 systems) are gravitationally bound. This is the cluster proper. Its mass density profile is perfectly fitted by a Plummer model with a central density of 2.21M/pc3 and a core radius of rco=3.10pc, while the half-mass radius is rh=4.1pc. There are another 100M in a volume between one and two tidal radii (halo), and another 60M up to a distance of 30pc from the centre. Strong mass segregation is inherent in the cluster. The present-day luminosity and mass functions are noticeably different in various parts of the cluster (core, corona, halo, and co-movers). They are strongly evolved compared to presently favoured initial mass functions. The analysis of the velocity dispersion of the cluster shows that about 20% of its members must be binaries. As a by-product, we find that presently available theoretical isochrones are not able to adequately describe the near-infrared colour-absolute magnitude relation for those cluster stars that are less massive than about 0.6M. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 204 724 Data of 724 Hyades candidates
See also: I/317 : The PPMXL Catalog (Roeser+ 2010) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/280 : All-sky Compiled Catalogue of 2.5 million stars (Kharchenko+ 2009) I/304 : Carlsberg Meridian Catalog 14 (CMC14) (CMC, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/724] Running number 5- 16 F12.7 deg RAdeg Right Ascension J2000.0, epoch 2000.0 18- 29 F12.7 deg DEdeg Declination J2000.0, epoch 2000.0 32- 38 F7.2 mas/yr pmRA Proper motion in RA*cos(DE) 40- 46 F7.2 mas/yr pmDE Proper motion in DE 48- 51 F4.1 mas/yr e_pmRA Mean error of pmRA 53- 56 F4.1 mas/yr e_pmDE Mean error of pmDE 58- 64 F7.3 mag Bmag ?=-9.999 Johnson B magnitude (from ASCC-2.5, I/280) 66- 72 F7.3 mag e_Bmag ?=-0.099 Standard error of B magnitude 74- 80 F7.3 mag Vmag ?=-9.999 Johnson V magnitude (from ASCC-2.5, I/280) 82- 88 F7.3 mag e_Vmag ?=-0.099 Standard error of V magnitude 90- 96 F7.3 mag Jmag ?=-9.999 2MASS J magnitude (II/246) 98-104 F7.3 mag e_Jmag ?=-0.099 Standard error of J magnitude 106-112 F7.3 mag Hmag ?=-9.999 2MASS H magnitude (II/246) 114-120 F7.3 mag e_Hmag ?=-0.099 Standard error of H magnitude 122-128 F7.3 mag Ksmag ?=-9.999 2MASS Ks magnitude (II/246) 130-136 F7.3 mag e_Ksmag ?=-0.099 Standard error of Ks magnitude 138-144 F7.3 mag rmag ?=-9.999 SDSS r' magnitude from CMC14 (I/304) 146-152 F7.3 mag e_rmag ?=-0.099 Standard error of r' magnitude 154-158 F5.2 mas plx Secular parallax 160-163 F4.2 mas e_plx Mean error of Secular parallax 165-169 F5.2 pc Dist Distance from the cluster centre 171-175 F5.2 km/s RV Predicted radial velocity 177-181 F5.2 km/s Vpar Tangential velocity in direction to the convergent point 183-186 F4.2 km/s e_Vpar Mean error of Vpar 188-192 F5.2 km/s Vper Tangential velocity perpendicular to the direction to the convergent point 194-197 F4.2 km/s e_Vper Mean error of Vper 199-204 F6.2 Msun Mass mass of the star (from M/L relation) (1)
Note (1): Three different M/L relations have been used. See explanation in the paper.
Acknowledgements: Siegfried Roeser, roeser(at)ari.uni-heidelberg.de
(End) Patricia Vannier [CDS] 30-May-2011
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