J/A+A/621/L2 Hyades tidal tails revealed by Gaia DR2 (Roeser+, 2019)
Hyades tidal tails revealed by Gaia DR2.
Roeser S., Schilbach E., Goldman B.
<Astron. Astrophys. 621, L2 (2019)>
=2019A&A...621L...2R 2019A&A...621L...2R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Populations, stellar
Keywords: parallaxes - proper motions -
open clusters and associations: general -
open clusters and associations: individual: Hyades
Abstract:
Within a 200pc sphere around the Sun, we search for the Hyades tidal
tails in the Gaia DR2 dataset. We used a modified convergent-point
method to search for stars with space velocities close to the space
velocity of the Hyades cluster. We find a clear indication for the
existence of the Hyades tidal tails, a leading tail extending up to
170pc from the centre of the Hyades with 292 stars (36 contaminants),
and a trailing tail up to 70pc with 237 stars (32 contaminants). A
comparison with an N-body model of the cluster and its tails shows
remarkably good coincidence. Five white dwarfs are found in the tails.
Description:
All parameters based on or derived from Gaia DR2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 75 1316 All the star shown in Figures 3a to 3c
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/243/386 : Hyades members distances (Schwan 1991)
J/A+A/331/81 : Hyades membership (Perryman+ 1998)
J/A+A/367/111 : A Hipparcos study of the Hyades cluster (de Bruijne+, 2001)
J/A+A/621/L2 : Hyades tidal tails with Gaia DR2 (Meingast+, 2019)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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3- 21 I19 --- Source Gaia DR2 source id (source_id)
23- 34 F12.8 deg RAdeg Gaia DR2 right ascension (ICRS at Ep=2015.5)
rounded to 10-8 degrees
36- 47 F12.8 deg DEdeg Gaia DR2 declination (ICRS at Ep=2015.5)
rounded to 10-8 degrees
49- 58 F10.6 mag Gmag G-band mean magnitude (Vega) (photgmean_mag)
60- 67 A8 --- Member Membership to subgroups (1)
68- 75 A8 --- Comment Comment may take the values (2)
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Note (1): Membership to subgroups as follows:
Cluster = stars within 18pc from the centre of the Hyades
Pr_tail = stars in the preceding tail
Tr_tail = stars in the trailing tail
other = all other stars
Note (2): Comment as follows:
Contam. = i.e. stars identified as contaminants on the basis of the
Colour- Absolute-Magnitude Diagram
WD = stars identified as white dwarf candidates
- = else
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Acknowledgements:
Siegfried Roeser, roeser(at)ari.uni-heidelberg.de
(End) Siegfried Roeser [Heidelberg], Patricia Vannier [CDS] 25-Dec-2018