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G-Band Period-Luminosity Relation For Galactic Cepheids Based on Gaia DR1 Measurements

Published online by Cambridge University Press:  07 March 2018

Chow-Choong Ngeow Open the ORCID record for Chow-Choong Ngeow [Opens in a new window] ,
Anupam Bhardwaj  and
Shashi M. Kanbur
Chow-Choong Ngeow
Affiliation:
Graduate Institute of Astronomy, National Central University, Jhongli 32001, Taiwan email: cngeow@astro.ncu.edu.tw
Anupam Bhardwaj
Affiliation:
Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India European Southern Observatory, Karl-Schwarzschild-Straße 2, Garching 85748, Germany
Shashi M. Kanbur
Affiliation:
Department of Physics, SUNY Oswego, Oswego, NY 13126, USA
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Abstract

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Classical Cepheids (hereafter Cepheids) are important standard candle as they obey the famous period-luminosity (PL) relation. Parallax measurements from Gaia offer a unique opportunity to derive or calibrate the PL relations for Galactic Cepheids, as traditionally their distances were measured via different methods. In this work, we attempted to derive the Gaia G-band PL relation based on the Gaia Data Release 1 (DR1) measurements. We adopted the inferred distances provided by Astraatmadja & Bailer-Jones (2016), calculated using two priors in a Bayesian analysis, and cross-matched to known Galactic Cepheids. The resulting G-band PL relation, however, exhibits a much larger scatter than expected. Hence the inferred distances based on the Gaia DR1 parallaxes are not suitable for calibrating the Galactic PL relation, and future Data Releases with improved parallax measurements are desirable.

Keywords

Cepheidsdistance scalestars: distances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 337 - 338
Copyright
Copyright © International Astronomical Union 2018 

References

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Lindegren, L., Lammers, U., Bastian, U., et al., 2016, Astronomy & Astrophysics, 595, A4 CrossRefGoogle Scholar
Ngeow, C.-C., 2012, The Astrophysical Journal, 747, 50 CrossRefGoogle Scholar