ausblenden:
Schlagwörter:
parallaxes
proper motions
open clusters and associations: general
open clusters and associations: individual: Hyades
Astrophysics - Solar
and Stellar Astrophysics
Astrophysics - Astrophysics of Galaxies
Zusammenfassung:
Aims: Within a 200 pc sphere around the Sun, we search for the Hyades tidal tails in the Gaia DR2 dataset.
Methods: We used a modified convergent-point method to search for stars with space velocities close to the space velocity of the Hyades cluster.
Results: We find a clear indication for the existence of the Hyades tidal tails, a leading tail extending up to 170 pc from the centre of the Hyades with 292 stars (36 contaminants), and a trailing tail up to 70 pc 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. We acknowledge the simultaneous publication by Meingast & Alves (2019), who also used Gaia DR2 to present evidence for the existence of the Hyades's tidal tails. The authors of both publications did not know about each other's work and arrived at their conclusions independently.The data of all 1316 stars from Fig. 3 are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/621/L2">http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/621/L2</A>
