Characterizing the Evolved Stellar Population in the Galactic Foreground. I. Bolometric Magnitudes, Spatial Distribution and Period-Luminosity Relations

Radio campaigns using maser stellar beacons have provided crucial information to characterize Galactic stellar populations. Currently, the Bulge Asymmetries and Dynamical Evolution (BAaDE) project is surveying infrared (IR) color-selected targets for SiO masers. This provides a sample of evolved sta...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2020-11, Vol.904 (1), p.82
Main Authors: Quiroga-Nuñez, Luis Henry, van Langevelde, Huib Jan, Sjouwerman, Loránt O., Pihlström, Ylva M., Brown, Anthony G. A., Rich, R. Michael, Stroh, Michael C., Lewis, Megan O., Habing, Harm J.
Format: Article
Language:English
Subjects:
Astrometry
Astrophysics
Asymptotic giant branch stars
Bolometers
Galactic evolution
Galaxies
Galaxy stellar content
Interferometry
Luminosity
Masers
Parallax
Periodic variable stars
Solar neighborhood
Spatial distribution
Stellar evolution
Stellar populations
Surveying
Surveys
Very long base interferometry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Radio campaigns using maser stellar beacons have provided crucial information to characterize Galactic stellar populations. Currently, the Bulge Asymmetries and Dynamical Evolution (BAaDE) project is surveying infrared (IR) color-selected targets for SiO masers. This provides a sample of evolved stars that can be used to study the inner, optically obscured Galaxy using line-of-sight velocities and possibly very long baseline interferometry proper motions. In order to use the BAaDE sample for kinematic studies, the stellar population should be characterized. In this study, the BAaDE targets have been cross-matched with IR (2MASS) and optical (Gaia) samples. By exploring the synergies of this cross-match together with Gaia parallaxes and extinction maps, the local (d < 2 kpc) asymptotic giant branch (AGB) stars can be characterized. We have defined a BAaDE-Gaia sample of 20,111 sources resulting from cross-matching BAaDE targets with IR and optical surveys. From this sample, a local sample of 1812 evolved stars with accurate parallax measurements, confirmed evolved stellar evolution stage, and within 2 kpc distance around the Sun was selected, for which absolute (bolometric) magnitudes are estimated. The evolved stellar population with Gaia counterparts that are variable seems to be predominantly associated with AGB stars with moderate luminosity ( ) and periods between 250 and 1250 days.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/abb5a6