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Finding evolved stars in the inner Galactic disk with Gaia

Published online by Cambridge University Press:  07 March 2018

L. H. Quiroga-Nuñez Open the ORCID record for L. H. Quiroga-Nuñez [Opens in a new window] ,
H. J. van Langevelde ,
Y. M. Pihlström ,
L. O. Sjouwerman  and
A. G. A. Brown
L. H. Quiroga-Nuñez
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands. emails: quiroganunez@strw.leidenuniv.nl; brown@strw.leidenuniv.nl Joint Institute for VLBI ERIC (JIVE), Postbus 2, 7990 AA Dwingeloo, The Netherlands. email: langevelde@jive.eu
H. J. van Langevelde
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands. emails: quiroganunez@strw.leidenuniv.nl; brown@strw.leidenuniv.nl Joint Institute for VLBI ERIC (JIVE), Postbus 2, 7990 AA Dwingeloo, The Netherlands. email: langevelde@jive.eu
Y. M. Pihlström
Affiliation:
Department of Physics and Astronomy, University of New Mexico, MSC07 4220, Albuquerque, NM 87131, USA. email: ylva@unm.edu
L. O. Sjouwerman
Affiliation:
National Radio Astronomy Observatory, P.O. Box 0, Lopezville Road 1001, Socorro, NM 87801, USA. email: lsjouwer@nrao.edu
A. G. A. Brown
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands. emails: quiroganunez@strw.leidenuniv.nl; brown@strw.leidenuniv.nl
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Abstract

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The Bulge Asymmetries and Dynamical Evolution (BAaDE) survey will provide positions and line-of-sight velocities of ~20, 000 evolved, maser bearing stars in the Galactic plane. Although this Galactic region is affected by optical extinction, BAaDE targets may have Gaia cross-matches, eventually providing additional stellar information. In an initial attempt to cross-match BAaDE targets with Gaia, we have found more than 5,000 candidates. Of these, we may expect half to show SiO emission, which will allow us to obtain velocity information. The cross-match is being refined to avoid false positives using different criteria based on distance analysis, flux variability, and color assessment in the mid- and near-IR. Once the cross-matches can be confirmed, we will have a unique sample to characterize the stellar population of evolved stars in the Galactic bulge, which can be considered fossils of the Milky Way formation.

Keywords

Galaxy: bulgestars: AGB and post-AGBmasersastrometry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 245 - 248
Copyright
Copyright © International Astronomical Union 2018 

References

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