On the Oosterhoff dichotomy in the Galactic bulge - II. Kinematical distribution

0511717 - ASÚ 2020 RIV GB eng J - Journal Article
Prudil, Z. - Dékány, I. - Grebel, E.K. - Catelan, M. - Skarka, Marek - Smolec, R.
On the Oosterhoff dichotomy in the Galactic bulge - II. Kinematical distribution.
Monthly Notices of the Royal Astronomical Society. Roč. 487, č. 3 (2019), s. 3270-3278. ISSN 0035-8711. E-ISSN 1365-2966
R&D Projects: GA ČR(CZ) GC17-01752J
Institutional support: RVO:67985815
Keywords : variable stars * galaxy * kinematics and dynamics
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.357, year: 2019
Method of publishing: Limited access
https://doi.org/10.1093/mnras/stz1484

We present a kinematical study of RR Lyrae stars associated with two Oosterhoff groups in the Galactic bulge, We used data published in the first paper of the series, plus proper motions from the Gaia Data Release 2, and radial velocities from the literature, A 6D kinematical and spatial solution was obtained for 429 RR Lyrae stars, We use a model of the Galactic gravitational potential to infer stellar orbits. We did not find a difference between the Oosterhoff groups in the individual components of the space velocity. We report that foreground and background stars with respect to the Galactic bulge stand out in the mean V velocity component, which we interpret as a sign of the Galactic rotation.
Permanent Link: http://hdl.handle.net/11104/0301935