J/A+A/598/A48 Parallaxes for 1146 Pleiades stars (Galli+, 2017)
A revised moving cluster distance to the Pleiades open cluster.
Galli P.A.B., Moraux E., Bouy H., Bouvier J., Olivares J., Teixeira R.
<Astron. Astrophys. 598, A48 (2017)>
=2017A&A...598A..48G 2017A&A...598A..48G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Proper motions ; Stars, distances
Keywords: stars: distances ; open clusters and associations: Pleiades
Abstract:
The distance to the Pleiades open cluster has been extensively debated
in the literature over several decades. Although different methods
point to a discrepancy in the trigonometric parallaxes produced by the
Hipparcos mission, the number of individual stars with known distances
is still small compared to the number of cluster members to help solve
this problem. We provide a new distance estimate for the Pleiades
based on the moving cluster method, which will be useful to further
discuss the so-called Pleiades distance controversy and compare it
with the very precise parallaxes from the Gaia space mission. We apply
a refurbished implementation of the convergent point search method to
an updated census of Pleiades stars to calculate the convergent point
position of the cluster from stellar proper motions. Then, we derive
individual parallaxes for 64 cluster members using radial velocities
compiled from the literature, and approximate parallaxes for another
1146 stars based on the spatial velocity of the cluster. This
represents the largest sample of Pleiades stars with individual
distances to date. The parallaxes derived in this work are in good
agreement with previous results obtained in different studies
(excluding Hipparcos) for individual stars in the cluster. We report a
mean parallax of 7.44±0.08mas and distance of 134.4+2.9-2.8pc
that is consistent with the weighted mean of 135.0±0.6pc obtained
from the non-Hipparcos results in the literature. Our result for the
distance to the Pleiades open cluster is not consistent with the
Hipparcos catalog, but favors the recent and more precise distance
determination of 136.2±1.2pc pc obtained from Very Long Baseline
Interferometry observations. It is also in good agreement with the
mean distance of 133±5pc obtained from the first trigonometric
parallaxes delivered by the Gaia satellite for the brightest cluster
members in common with our sample.
Description:
Positions, proper motions and kinematic parallaxes are presented for
1146 stars of the Pleiades open cluster.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 70 1146 Approximate parallaxes for 1146 stars
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See also:
J/A+A/563/A45 : Pleiades cluster membership probabilities (Sarro+, 2014)
J/A+A/577/A148 : The Seven Sisters DANCe. I. Pleiades (Bouy+, 2015)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- DANCe DANCe Survey ID (JHHMMSS.ss+DDMMSS.s)
21- 22 I2 h RAh Right Ascension (J2000)
24- 25 I2 min RAm Right Ascension (J2000)
27- 31 F5.2 s RAs Right Ascension (J2000)
32 A1 --- DE- Declination sign (J2000)
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 43 F5.2 arcsec DEs Declination (J2000)
44- 48 F5.1 mas/yr pmRA Proper motion in RA (pmRA*cos(DE))
50- 52 F3.1 mas/yr e_pmRA Error on proper motion in RA
54- 58 F5.1 mas/yr pmDE Proper motion in DE
60- 62 F3.1 mas/yr e_pmDE Error on proper motion in DE
64- 66 F3.1 mas plx Kinematic parallax
68- 70 F3.1 mas e_plx Error on kinematic parallax
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Acknowledgements:
Phillip Galli, phillip.galli(at)iag.usp.br
(End) Patricia Vannier [CDS] 31-Oct-2016