I/349 StarHorse, Gaia DR2 photo-astrometric distances (Anders+, 2019)
Photo-astrometric distances, extinctions, and astrophysical parameters for
Gaia DR2 stars brighter than G = 18.
Anders F., Khalatyan A., Chiappini C., Queiroz A.B., Santiago B.X.,
Jordi C., Girardi L., Brown A.G.A., Matijevic G., Monari G.,
Cantat-Gaudin T., Weiler M., Khan S., Miglio A., Carrillo I.,
Romero-Gomez M., Minchev I., de Jong R.S., Antoja T., Ramos P.,
Steinmetz M., Enke H.
<Astron. Astrophys. 628, A94 (2019)>
=2019A&A...628A..94A 2019A&A...628A..94A (SIMBAD/NED BibCode)
=2020yCat.1349....0A 2020yCat.1349....0A
ADC_Keywords: Surveys ; Stars, distances ; Extinction
Keywords: stars: fundamental parameters - stars: distances - stars: statistics -
dust - extinction - Galaxy: stellar content - Galaxy: structure
Abstract:
Combining the precise parallaxes and optical photometry delivered by
Gaia's second data release with the photometric catalogues of
Pan-STARRS1, 2MASS, and AllWISE, we derived Bayesian stellar
parameters, distances, and extinctions for 265 million of the 285
million objects brighter than G=18. Because of the wide
wavelength range used, our results substantially improve the accuracy
and precision of previous extinction and effective temperature
estimates. After cleaning our results for both unreliable input and
output data, we retain 137 million stars, for which we achieve a
median precision of 5% in distance, 0.20mag in V-band extinction, and
245K in effective temperature for G≤14, degrading towards
fainter magnitudes (12%, 0.20mag, and 245K at G=16; 16%, 0.23mag, and
260K at G=17, respectively). We find a very good agreement with the
asteroseismic surface gravities and distances of 7000 stars in the
Kepler, K2-C3, and K2-C6 fields, with stellar parameters from the
APOGEE survey, and with distances to star clusters. Our results are
available through the ADQL query interface of the Gaia mirror at the
Leibniz-Institut fuer Astrophysik Potsdam (gaia.aip.de) and as binary
tables at data.aip.de. As a first application, we provide distance-
and extinction-corrected colour-magnitude diagrams, extinction maps as
a function of distance, and extensive density maps. These demonstrate
the potential of our value-added dataset for mapping the
three-dimensional structure of our Galaxy. In particular, we see a
clear manifestation of the Galactic bar in the stellar density
distributions, an observation that can almost be considered direct
imaging of the Galactic bar.
Description:
The catalogue contains derived Bayesian stellar parameters, distances,
and extinctions for 265 million stars form Gaia's second data release
(Cat. I/345) brighter than G=18 with the StarHorse code.
The StarHorse code (Queiroz et al., 2018MNRAS.476.2556Q 2018MNRAS.476.2556Q) is a Bayesian
parameter estimation code that compares a number of observed
quantities (be it photometric magnitudes, spectroscopically derived
stellar parameters, or parallaxes) to stellar evolutionary models.
Here, the Gaia data is complemented by the photometric catalogues of
Pan-STARRS1 (Cat. II/349), 2MASS (Cat. II/246) , and AllWISE (Cat.
II/328).
All files are available at
https://data.aip.de/projects/starhorse2019.html
The SH data is avalaible in three formats: hdf5, fits and csv. The
data are split into 16 chunks for the each format.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
starhorse.sam 424 1000 First 1000 lines as an example, Starhorse 2019
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/328 : AllWISE Data Release (Cutri+ 2013)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
https://data.aip.de/projects/starhorse2019.html : Catalog Home Page
Byte-by-byte Description of file: starhorse.sam
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.10 deg RAdeg Barycentric right ascension (ICRS)
at Ep=2015.5 (from Gaia DR2)
16- 29 F14.10 deg DEdeg Barycentric declination (ICRS)
at Ep=2015.5 (from Gaia DR2)
31- 49 I19 --- Source Gaia DR2 source number
51- 71 A21 --- FlagPhoto List of filter used as input for StarHorse
(SH_PHOTOFLAG) (1)
73- 83 A11 --- FlagPlx Informs about the precision of the Gaia DR2
parallaxes (SH_PARALLAXFLAG) (2)
85- 87 A3 --- FlagGaia Describes the overall astrometric and
photometric quality of the Gaia DR2 data for
each star in a three-digit flag
(SH_GAIAFLAG) (3)
89- 93 A5 --- FlagOut Similar to SH_GAIAFLAG, consists of several
digits that inform about the fidelity of the
StarHorse output parameters (SH_OUTFLAG) (4)
95-104 F10.6 kpc dist05 StarHorse distance, 5th percentile
106-115 F10.6 kpc dist16 StarHorse distance, 16th percentile
117-126 F10.6 kpc dist50 StarHorse distance, 50th percentile
128-137 F10.6 kpc dist84 StarHorse distance, 84th percentile
139-148 F10.6 kpc dist95 StarHorse distance, 95th percentile
150-158 F9.6 mag AV05 StarHorse line-of-sight extinction at
λ=5420Å, 5th percentile
160-168 F9.6 mag AV16 StarHorse line-of-sight extinction at
λ=5420Å, 16th percentile
170-178 F9.6 mag AV50 StarHorse line-of-sight extinction at
λ=5420Å, 50th percentile
180-188 F9.6 mag AV84 StarHorse line-of-sight extinction at
λ=5420Å, 84th percentile
190-198 F9.6 mag AV95 StarHorse line-of-sight extinction at
λ=5420Å, 95th percentile
200-208 F9.6 mag AG50 StarHorse line-of-sight extinction in the
G band, derived from AV50 and teff50
210-217 F8.2 K teff16 StarHorse effective temperature,
16th percentile
219-226 F8.2 K teff50 StarHorse effective temperature,
50th percentile
228-235 F8.2 K teff84 StarHorse effective temperature,
84th percentile
237-245 F9.6 [cm/s2] logg16 StarHorse surface gravity, 16th percentile
247-255 F9.6 [cm/s2] logg50 StarHorse surface gravity, 50th percentile
257-265 F9.6 [cm/s2] logg84 StarHorse surface gravity, 84th percentile
267-275 F9.6 [-] met16 StarHorse metallicity, 16th percentile
277-285 F9.6 [-] met50 StarHorse metallicity, 50th percentile
287-295 F9.6 [-] met84 StarHorse metallicity, 84th percentile
297-305 F9.6 Msun mass16 StarHorse stellar mass, 16th percentile
307-315 F9.6 Msun mass50 StarHorse stellar mass, 50th percentile
317-325 F9.6 Msun mass84 StarHorse stellar mass, 84th percentile
327-335 F9.6 mag ABP50 StarHorse line-of-sight extinction in the GBP
band, 50th percentile, derived from
AV50 and teff50
337-345 F9.6 mag ARP50 StarHorse line-of-sight extinction in the GRP
band, 50th percentile, derived from
AV50 and teff50
347-355 F9.6 mag BP-RP0 ?=- StarHorse dereddened colour (GBP-GRP)_0),
derived from photbpmean_mag,
photrpmean_mag, ABP50, and ARP50
357-366 F10.6 mag MG0 StarHorse absolute magnitude, derived from
photgmean_mag (recalibrated), dist50, and
AG50
368-378 F11.6 kpc XGal StarHorse Galactocentric Cartesian
X co-ordinate, derived from dist50 and
assuming R0=8.2kpc
380-390 F11.6 kpc YGal StarHorse Galactocentric Cartesian
Y co-ordinate, derived from dist50 and
assuming R0=8.2kpc
392-402 F11.6 kpc ZGal StarHorse Galactocentric Cartesian
Z co-ordinate, derived from dist50 and
assuming R0=8.2kpc
404-413 F10.6 kpc RGal StarHorse Galactocentric planar distance,
derived from XGal and YGal
415-424 F10.6 --- ruwe Gaia DR2 renormalised unit-weight error
(Lindegren et al., 2018A&A...616A...2L 2018A&A...616A...2L)
--------------------------------------------------------------------------------
Note (1): SH_PHOTOFLAG. For example, if photometry in all passbands was
available for a star, the SH_PHOTOFLAG entry reads GBPRPgrizyJHKsW1W2,
with GBPRP from Gaia DR2, grizy from Pan-STARRS1, JHKs from 2MASS and
W1W2 from WISE
Note (2): SH_PARALLAXFLAG: For mcal/σmcal>5 (parallaxes better
than 20%), the flag reads gtr5, else leq5
Note (3): SH_GAIAFLAG: similar to the Gaia DR2-native priam_flag.
digit 1: [0/1] Renormalised unit weight error flag.
0 if ruwe<1.4
1 else
digit 2: [0/2] Colour excess factor flag.
2 if GBP-GRP IS NULL THEN
0 if 1.0+0.015*(GBP-GRP)2<photbprpexcessfactor<1.3+0.060*(GBP-GRP)2
1 else
digit 3: [0/1] Variability flag: The third digit equals the Gaia DR2-native
photvariableflag
Note (4): SH_OUTFLAG: Similar to SH_GAIAFLAG, consists of several digits that
inform about the fidelity of the StarHorse output parameters
digit 1: [0/1] Main StarHorsereliability flag (1 for very broad distance)
digit 2: [0/2] Large distance flag:
0 if dist50 < 20
1 if dist50 < 30
2 else
digit 3: [0/3] Unreliable extinction flag:
0 if (AV95>0 AND AV95<3.9
1 if AV95<0
2 if AV84<3.9
3 else
digit 4: [0/1] Large AV uncertainty flag:
0 if 0.5*(AV84-AV16)<1
1 else
digit 5: [0/1] Very small uncertainty flag: Very small posterior uncertainties
are most likely underestimated and indicate poor StarHorse convergence
(either due to inconsistent input data or too coarse model grid size).
These results should therefore also be used with care.
0 if 0.5*(dist84-dist16)/dist50<0.35 and logg504.1 or
0.5*(dist84-dist16)/dist50<1.0347-1.617*log50 and logg50≤4.1
1 else
--------------------------------------------------------------------------------
(End) Patricia Vannier [CDS] 03-Sep-2019