J/A+A/640/A2 Dwarfs & giants surface brightness-colour relations (Salsi+, 2020)
Precise calibration of the dependence of surface brightness-colour relations
on colour and class for late-type stars.
Salsi A., Nardetto N., Mourard D., Creevey O., Huber D., White T.R.,
Hocde V., Morand F., Tallon-Bosc I., Farrington C.D., Chelli A., Duvert G.
<Astron. Astrophys. 640, A2 (2020)>
=2020A&A...640A...2S 2020A&A...640A...2S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, fundamental ; Stars, dwarfs ; Stars, giant ;
Stars, diameters ; Interferometry
Keywords: stars: fundamental parameters - cosmology: distance scale -
techniques: interferometric
Abstract:
Surface brightness-colour relations (SBCRs) are used to derive the
stellar angular diameters from photometric observations. They have
various astrophysical applications, such as the distance determination
of eclipsing binaries or the determination of exoplanet parameters.
However, strong discrepancies between the SBCRs still exist in the
literature, in particular for early and late-type stars. We aim at
calibrating new SBCRs as a function of the spectral type and the
luminosity class of the stars. Our purpose is also to apply
homogeneous criteria for the selection of the reference stars and on
the basis of an exhaustive and up-to-date list of interferometric
late-type targets.
We implement criteria to select measurements in the JMMC Measured
Diameters Catalog (JMDC). We then apply additional criteria on the
photometric measurements used to build the SBCRs, together with
stellar characteristics diagnostics. We build SBCRs for F5/K7-II/III,
F5/K7-IV/V, M-II/III and M-V stars, with respective RMS of
σFV=0.0022mag, σFV =0.0044mag, σFV=0.0046mag,
and σFV=0.0038mag. This results in a precision on the angular
diameter of 1.0%, 2.0%, 2.1% and 1.7%, respectively. These relations
cover a large V-K colour range of magnitude, from 1 to 7.5. Our work
demonstrates that SBCRs are significantly dependent on the spectral
type and the luminosity class of the star. Through a new set of
interferometric measurements, we demonstrate the critical importance
of the selection criteria proposed for the calibration of SBCR.
Finally, using the Gaia photometry for our samples, we obtain (G-K)
SBCRs with a precision on the angular diameter between 1.1% and 2.4%.
By adopting a refined and homogeneous methodology we show that the
spectral type and the class of the star should be considered when
applying a SBCR. This is particularly important in the context of
PLATO.
Description:
Photometric and interferometric parameters of 534 late-type stars and
the associated references. The stars are separated into four tables,
according to their spectral type and luminosity class, leading to
F5/K7-II/III, F5/K7-IV/V, M-II/III and M-IV/V samples. Interferometric
measurements are taken from the JMMC Measured Diameters Catalog (JMDC,
Duvert, 2016, Cat. II/345). The selection criteria to build new
precise SBCRs for late-type stars are indicated in the "Notes" column.
If the star is chosen to be part of the final sample, a "1" value is
notified in the "Rej/Keep" column.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
dwarfs.dat 124 156 F5/K7-IV/V sample
giants.dat 124 274 F5/K7-II/III sample
m_dwarfs.dat 124 37 M-V sample
m_giants.dat 124 67 M-II/III sample
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See also:
II/345 : JMDC: JMMC Measured Stellar Diameters Catalogue (Duvert, 2016)
Byte-by-byte Description of file: *.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star ID
10- 16 F7.4 mas ThetaLD Limb-darkened angular diameter
18- 23 F6.4 mas e_ThetaLD Error on the limb-darkened angular diameter
25- 34 A10 --- Band Spectral band of the interferometric
measurement
36- 54 A19 --- Ref Source of the interferometric measurement
56- 69 A14 --- SpType Spectral type
71- 76 F6.3 mag Vmag V photometry
78- 83 F6.4 mag e_Vmag Error on the V photometry
84- 89 F6.3 mag Kmag K photometry
91- 95 F5.3 mag e_Kmag Error on the K photometry
97-102 F6.4 mag Av Interstellar attenuation from Stilism
104-106 A3 --- r_Kmag Keywords relative to references used for the
infrared K-photometry (1)
108-122 A15 --- Notes Selection criteria used to constrain
new SBCRs (2)
124 I1 --- Rej/Keep [0/1] Reject or keep the star, according to
selection criteria (3)
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Note (1): Code as follows:
2M = 2MASS (Cutri et al., 2003, Cat. II/246)
De = DENIS Consortium (2005, Cat. B/denis)
Du = Ducati (2002, Cat. II/237)
La = Lallement et al., 2014A&A...561A..91L 2014A&A...561A..91L
M19 = Mann et al. (2019, Cat. J/ApJ/871/63)
T = TMSS (Neugebauer & Leighton, 1969, Cat. II/2)
Ta = Tabur et al. (2009, Cat. J/ApJ/703/L72)
V = van Belle & van Braun (2009, Cat. J/ApJ/694/1085)
Note (2): Stars with blanks here are those chosen to calibrate the SBCRs.
Note (3): Code as follows:
0 = rejected stars
1 = selected stars
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Acknowledgements:
Anthony Salsi, anthony.salsi(at)oca.eu
(End) Anthony Salsi [OCA], Patricia Vannier [CDS] 28-May-2020