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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 204 724 Data of 724 Hyades candidates
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): Three different M/L relations have been used.
See explanation in the paper.
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Acknowledgements:
Siegfried Roeser, roeser(at)ari.uni-heidelberg.de
(End) Patricia Vannier [CDS] 30-May-2011