Praesepe (NGC 2632) and its tidal tails

• Verfasst von: Röser, Siegfried [VerfasserIn]
• Verfasst von: Schilbach, Elena [VerfasserIn]
• Titel: Praesepe (NGC 2632) and its tidal tails
• Verf.angabe: Siegfried Röser and Elena Schilbach
• E-Jahr: 2019
• Jahr: 16 April 2019
• Umfang: 6 S.
• Fussnoten: Gesehen am 05.08.2019
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2019
• Band/Heft Quelle: 627(2019) Artikel-Nummer A4, 6 Seiten
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/201935502
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1670571580

Abstract

Aims. Within a 400 pc sphere around the Sun, we search for Praesepe’s tidal tails in the Gaia Data Release 2 (DR2) data set. Methods. We used a modified convergent-point method to find stars with space velocities close to the space velocity of the Praesepe cluster. Results. We find a clear indication for the existence of Praesepe’s tidal tails, both extending up to 165 pc from the centre of the cluster. A total of 1393 stars populate the cluster and its tails, giving a total mass of 794 M⊙. We determined a tidal radius of 10.77 pc for the cluster and a tidal mass of 483 M⊙. The corresponding half-mass radius is 4.8 pc. We also found a clear indication for mass segregation in the cluster. The tidal tails outside 2 tidal radii are populated by 389 stars. The total contamination of our sample by field stars lies between 50 and 100 stars or 3.6–7.2%. We used an astrometrically and photometrically clean subsample of Gaia DR2, which makes our Praesepe sample incomplete beyond MG ≈ 12.0 mag; this corresponds to about 0.25 M⊙. A comparison with an N-body model of the cluster and its tails shows remarkably good coincidence. Three new white dwarfs are found in the tails.