J/A+A/609/A116 Low extinction TGAS HR Catalogue (Ruiz-Dern+, 2018)
Empirical photometric calibration of the Gaia Red Clump:
Colours, effective temperature and absolute magnitude.
Ruiz-Dern L., Babusiaux C., Arenou F., Turon C., Lallement R.
<Astron. Astrophys. 609, A116 (2018)>
=2018A&A...609A.116R 2018A&A...609A.116R (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Parallaxes, trigonometric; Photometry, infrared ;
Extinction ; HR diagrams
Keywords: stars: fundamental parameters - stars: abundances -
stars: atmospheres - dust, extinction
Abstract:
Gaia Data Release 1 allows the recalibration of standard candles such
as the red clump stars. To use those stars, they first need to be
accurately characterised. In particular, colours are needed to derive
interstellar extinction. As no filter is available for the first Gaia
data release and to avoid the atmosphere model mismatch, an empirical
calibration is unavoidable.
The purpose of this work is to provide the first complete and robust
photometric empirical calibration of the Gaia red clump stars of the
solar neighbourhood through colour-colour, effective
temperature-colour, and absolute magnitude-colour relations from
the Gaia, Johnson, 2MASS, Hipparcos, Tycho-2, APASS-SLOAN, and WISE
photometric systems, and the APOGEE DR13 spectroscopic temperatures.
We used a 3D extinction map to select low reddening red giants. To
calibrate the colour-colour and the effective temperature-colour
relations, we developed a MCMC method that accounts for all variable
uncertainties and selects the best model for each photometric
relation. We estimated the red clump absolute magnitude through the
mode of a kernel-based distribution function.
We provide 20 colour versus G-Ks relations and the first Teff versus
G-Ks calibration. We obtained the red clump absolute magnitudes for
15 photometric bands with, in particular, MKs=(-1.606±0.009)
and MG=(0.495±0.009)+(1.121±0.128)(G-Ks-2.1). We present
a dereddened Gaia-TGAS HR diagram and use the calibrations to compare
its red clump and its red giant branch bump with Padova isochrones.
Description:
The low extinction TGAS HR Catalogue is a subset of the Tycho-Gaia
Astrometric Solution (TGAS) catalogue (Cat. I/337, tgas), that
contains 142996 stars with high astrometric and photometric quality
and very low interstellar extinction (maximum E(B-V) < 0.015)
according to the 3D extinction map of Capitanio et al.
(2017A&A...606A..65C 2017A&A...606A..65C), and the Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S)
2D map for stars for which the distance goes beyond the 3D map
borders. The precision of the Gaia DR1 astrometric parallaxes is
better than 10% for all the stars, and their G magnitude uncertainty
is lower than 0.01mag. Their infrared 2MASS J and Ks bands have high
quality photometric flags in the 2MASS catalogue II/246 (flag
q2M="A.A") and the uncertainties are lower than 0.03mag.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lowetgas.dat 132 142996 Low extinction TGAS HR diagram
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
Byte-by-byte Description of file: lowetgas.dat
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Bytes Format Units Label Explanations
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1- 20 I20 --- Source Gaia DR1 identifier (source_id)
23- 38 A16 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs)
41- 50 F10.6 mas plx Gaia parallax
53- 61 F9.7 mas e_plx Gaia parallax standard error
66- 74 F9.6 mag Gmag Gaia G magnitude
76- 87 F12.10 mag e_Gmag Gaia G magnitude error
90- 95 F6.3 mag Jmag 2MASS J magnitude
99-103 F5.3 mag e_Jmag 2MASS J magnitude error
106-111 F6.3 mag Kmag 2MASS Ks magnitude
115-119 F5.3 mag e_Kmag 2MASS Ks magnitude error
122-132 F11.9 mag E(B-V)max Maximum reddening
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Acknowledgements:
Laura Ruiz-Dern, laura.ruiz-dern(at)obspm.fr
(End) Patricia Vannier [CDS] 24-Oct-2017