A catalogue of oxygen-rich pulsating giants in the Galactic halo and the Sagittarius stream
Abstract
To construct a catalogue of oxygen-rich (M) asymptotic giant branch (AGB) stars in the halo, complementing the catalogues of carbon-rich (C) stars, previous lists of Miras and SRa semi-regulars located in the northern hemisphere are merged and cleaned of various defects. After putting aside known C stars, characteristics such as colours and periods indicate that most of the remaining objects are M stars. Distances are obtained through the period-luminosity relation. By considering their position in the sky, stars lying at |Z| > 5 kpc are confirmed to be in majority in the Sgr tidal arms. The M stars are more numerous than C ones. Our distance scale is supported by two cool variables located in the Pal 4 globular cluster. Along the Sgr arms, there is reasonable agreement on distances of our objects with recent RR Lyrae distances. A few stars may be as distant as 150 kpc, with possibly four at the trailing arm apocentre, and two in the A16 sub-structure, angularly close to two C stars. Ninety radial velocities are collected from Gaia and other sources. A catalogue with 417 M pulsating AGB stars is provided. This catalogue contains ∼260 stars in the halo with |Z| > 5 kpc. Their Ks magnitudes range from 8 up to 13. For comparison, the catalogue also provides ∼150 stars in the disc having 5 < Ks < 8.
Full Table 3 is only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/626/A112- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 2019
- DOI:
- 10.1051/0004-6361/201834089
- arXiv:
- arXiv:1903.12163
- Bibcode:
- 2019A&A...626A.112M
- Keywords:
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- Galaxy: halo;
- Galaxy: stellar content;
- stars: AGB and post-AGB;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 10 pages, 12 figs, 3 Tables. Accepted for publication by AA