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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 (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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 70 1146 Approximate parallaxes for 1146 stars
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
Bytes Format Units Label Explanations
1- 19 A19 --- DANCe DANCe Survey ID ( 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
Acknowledgements: Phillip Galli, phillip.galli(at)
(End) Patricia Vannier [CDS] 31-Oct-2016
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

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