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2019A&A...626A.112M - Astronomy and Astrophysics, volume 626A, 112-112 (2019/6-1)

A catalogue of oxygen-rich pulsating giants in the Galactic halo and the Sagittarius stream.


Abstract (from CDS):

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|>5kpc 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|>5kpc. Their Ks magnitudes range from 8 up to 13. For comparison, the catalogue also provides ∼150stars in the disc having 5<Ks<8.

Abstract Copyright: © N. Mauron et al. 2019

Journal keyword(s): Galaxy: halo - Galaxy: stellar content - stars: AGB and post-AGB

VizieR on-line data: <Available at CDS (J/A+A/626/A112): table3.dat>

Status in Simbad:  could be processed

Simbad objects: 26

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