J/MNRAS/507/318 15 million Gaia stars RGB phot. calibration (Cardiel+, 2021)
RGB photometric calibration of 15 million Gaia stars.
Cardiel N., Zamorano J., Carrasco J.M., Masana E., Bara S., Gonzalez R.,
Izquierdo J., Pascual S., Sanchez De Miguel A.
<Mon. Not. R. Astron. Soc., 507, 318-329 (2021)>
=2021MNRAS.507..318C 2021MNRAS.507..318C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Photometry, CCD ; Optical
Keywords: instrumentation: photometers - techniques: photometric -
catalogues - stars: general
Abstract:
Although a catalogue of synthetic RGB magnitudes, providing
photometric data for a sample of 1346 bright stars, has been recently
published, its usefulness is still limited due to the small number of
reference stars available, considering that they are distributed
throughout the whole celestial sphere, and the fact that they are
restricted to Johnson V<6.6mag. This work presents synthetic RGB
magnitudes for ∼15 million stars brighter than Gaia G=18mag, making
use of a calibration between the RGB magnitudes of the reference
bright star sample and the corresponding high quality photometric G,
G_BP and G_RP magnitudes provided by the Gaia EDR3. The calibration
has been restricted to stars exhibiting -0.5<GBP-GRP<2.0mag,
and aims to predict RGB magnitudes within an error interval of
±0.1mag. Since the reference bright star sample is dominated by
nearby stars with slightly undersolar metallicity, systematic
variations in the predictions are expected, as modelled with the help
of stellar atmosphere models. These deviations are constrained to the
±0.1mag interval when applying the calibration only to stars
scarcely affected by interstellar extinction and with metallicity
compatible with the median value for the bright star sample. The large
number of Gaia sources available in each region of the sky should
guarantee high-quality RGB photometric calibrations.
Description:
Full Table 2 from the paper, providing RGB magnitude estimates for
14854959 stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 140 14854959 Catalogue with RGB magnitudes for ∼15 million stars
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
I/354 : StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaEDR3 Source identifier in the Gaia EDR3
23- 35 F13.9 deg RAdeg Right ascension (ICRS) at Ep=2016.0
39- 51 F13.9 deg DEdeg Declination (ICRS) at Ep=2016.0
55- 59 F5.2 mag Brgb Blue RGB estimate
63- 67 F5.2 mag Grgb Green RGB estimate
71- 75 F5.2 mag Rrgb Red RGB estimate
79- 83 F5.2 mag Gmean Arithmetic mean of Brgb and Rrgb
87- 93 F7.4 mag Gmag Gaia G magnitude in the EDR3
97-103 F7.4 mag BPmag Gaia G_BP magnitude in the EDR3
107-113 F7.4 mag RPmag Gaia G_RP magnitude in the EDR3
117-122 F6.3 mag Av50 Interstellar extinction from StarHorse,
Cat. I/354
126-131 F6.3 --- met50 Metallicity [M/H] from StarHorse, Cat. I/354
135-140 F6.3 kpc dist50 Distance from StarHorse, Cat. I/354
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Acknowledgements:
Nicolas Cardiel, cardiel(at)ucm.es
(End) Patricia Vannier [CDS] 24-May-2022