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Calibration and characterisation of the Gaia Red Clump

Published online by Cambridge University Press:  07 March 2018

L. Ruiz-Dern ,
C. Babusiaux ,
F. Arenou ,
C. Danielski ,
C. Turon  and
P. Sartoretti
L. Ruiz-Dern
Affiliation:
GEPI, Observatoire de Paris, PSL Research University, CNRS UMR 8111 - 5 Place Jules Janssen, 92190 Meudon, France email: laura.ruiz-dern@obspm.fr
C. Babusiaux
Affiliation:
GEPI, Observatoire de Paris, PSL Research University, CNRS UMR 8111 - 5 Place Jules Janssen, 92190 Meudon, France email: laura.ruiz-dern@obspm.fr
F. Arenou
Affiliation:
GEPI, Observatoire de Paris, PSL Research University, CNRS UMR 8111 - 5 Place Jules Janssen, 92190 Meudon, France email: laura.ruiz-dern@obspm.fr
C. Danielski
Affiliation:
GEPI, Observatoire de Paris, PSL Research University, CNRS UMR 8111 - 5 Place Jules Janssen, 92190 Meudon, France email: laura.ruiz-dern@obspm.fr
C. Turon
Affiliation:
GEPI, Observatoire de Paris, PSL Research University, CNRS UMR 8111 - 5 Place Jules Janssen, 92190 Meudon, France email: laura.ruiz-dern@obspm.fr
P. Sartoretti
Affiliation:
GEPI, Observatoire de Paris, PSL Research University, CNRS UMR 8111 - 5 Place Jules Janssen, 92190 Meudon, France email: laura.ruiz-dern@obspm.fr
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Abstract

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We present new empirical Colour-Colour and Effective Temperature-Colour Gaia Red Clump calibrations. The selected sample takes into account high photometric quality, good spectrometric metallicity, homogeneous effective temperatures and low interstellar extinctions. From those calibrations we developed a method to derive the absolute magnitude, temperature and extinction of the Gaia RC. We tested our colour and extinction estimates on stars with measured spectroscopic effective temperatures and Diffuse Interstellar Band (DIB) constraints. Within the Gaia Validation team these calibrations are also being used, together with asteroseismic constraints, to check the parallax zero-point with Red Clump stars.

Keywords

Gaia Red Clumpphotometrystellar parameters: interstellar extinctioneffective temperature
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 313 - 316
Copyright
Copyright © International Astronomical Union 2018 

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