J/MNRAS/445/2758 KIC giants Bayesian distances and extinctions (Rodrigues+ 2014)
Bayesian distances and extinctions for giants observed by Kepler and APOGEE.
Rodrigues T.S., Girardi L., Miglio A., Bossini D., Bovy J., Epstein C.,
Pinsonneault M.H., Stello D., Zasowski G., Prieto C.A., Chaplin W.J.,
Hekker S., Johnson J.A., Meszaros S., Mosser B., Anders F., Basu S.,
Beers T.C., Chiappini C., Da Costa L.A.N., Elsworth Y., Garcia R.A.,
Garcia Perez A.E., Hearty F.R., Maia M.A.G., Majewski S.R., Mathur S.,
Montalban J., Nidever D.L., Santiago B., Schultheis M., Serenelli A.,
Shetrone M.
<Mon. Not. R. Astron. Soc., 445, 2758-2776 (2014)>
=2014MNRAS.445.2758R 2014MNRAS.445.2758R (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Stars, distances ; Extinction
Keywords: stars: distances - stars: fundamental parameters
Abstract:
We present a first determination of distances and extinctions for
individual stars in the first release of the APOKASC catalogue, built
from the joint efforts of the Apache Point Observatory Galactic
Evolution Experiment (APOGEE) and the Kepler Asteroseismic Science
Consortium (KASC). Our method takes into account the spectroscopic
constraints derived from the APOGEE Stellar Parameters and Chemical
Abundances Pipeline, together with the asteroseismic parameters from
KASC. These parameters are then employed to estimate intrinsic stellar
properties, including absolute magnitudes, using the Bayesian tool
param. We then find the distance and extinction that best fit the
observed photometry in Sloan Digital Sky Survey (SDSS), 2MASS, and
WISE passbands. The first 1989 giants targetted by APOKASC are found
at typical distances between 0.5 and 5kpc, with individual
uncertainties of just ∼1.8%. Our extinction estimates are
systematically smaller than provided in the Kepler Input Catalogue and
by the Schlegel et al. maps. Distances to individual stars in the NGC
6791 and NGC 6819 star clusters agree to within their credible
intervals. Comparison with the APOGEE red clump and SAGA catalogues
provide another useful check, exhibiting agreement with our
measurements to within a few per cent. Overall, present methods seem
to provide excellent distance and extinction determinations for the
bulk of the APOKASC sample. Approximately one third of the stars
present broad or multiple-peaked probability density functions and
hence increased uncertainties. Uncertainties are expected to be
reduced in future releases of the catalogue, when a larger fraction of
the stars will have seismically determined evolutionary status
classifications.
Description:
APOGEE uses a high-resolution infrared spectrograph, mounted at the
Apache Point Observatory 2.5m telescope, with a mean resolution of
∼22500 in the H band (spectral coverage: 1.51-1.70um). APOGEE has
already observed more than 100000 stars selected from 2MASS
photometry, at typical signal-to-noise ratios of ∼140 per resolution
element. The targeted stars are mostly red giant branch (RGB), red
clump (RC), and asymptotic giant branch stars (Zasowski et al.,
2013AJ....146...81Z 2013AJ....146...81Z), and are spread over all regions of the MW,
including the bulge, disc, and halo.
The Kepler space telescope has observed ∼196400 stars (Huber et al.,
2014ApJS..211....2H 2014ApJS..211....2H, Cat. J/ApJS/211/2) in a field of 105deg2
towards the constellations of Cygnus and Lyra (Borucki et al.,
2010Sci...327..977B 2010Sci...327..977B...327..997B). Apart from the discovery of
exoplanets and multiple stellar systems, the high temporal and
photometric quality of the data provides the possibility to study red
giants by detection of solar-like oscillations (e.g. Huber et al.,
2010ApJ...723.1607H 2010ApJ...723.1607H; Chaplin et al., 2011Sci...332..213C 2011Sci...332..213C).
In addition to the spectroscopic and asteroseismic parameters, stars
in the APOKASC catalogue have measured apparent magnitudes in SDSS
griz and DDO51, as measured by the KIC team (Brown et al., 2011, Cat.
J/AJ/142/112), and corrected by Pinsonneault et al. (2012, Cat.
J/ApJS/199/30);
JHKs from 2MASS (Cutri et al., 2003, Cat. II/246; Skrutskie et al.,
2006, Cat. VII/233);
the Kepler magnitude, Kp, as derived from a combination of the griz
magnitudes (Brown et al., 2011, Cat. J/AJ/142/112);
WISE photometry (at 3.35, 4.6, 11.6 and 22.1um, or W1 to W4) from
the Preliminary Release Source Catalog (Wright et al.,
2010AJ....140.1868W 2010AJ....140.1868W).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 106 1989 Derived distances and extinctions with the
Bayesian and direct methods for APOKASC stars
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
J/ApJS/199/30 : Effective temperature scale for KIC stars (Pinsonneault+, 2012)
J/ApJS/211/2 : Q1-16 Kepler targets revised stellar properties (Huber+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC KIC identification number
10- 26 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs)
28- 31 I4 pc DistB ?=- Distance from Bayesian method
33- 36 I4 pc b_DistB ?=- Lower limit of 68% confidence level of DistB
38- 41 I4 pc B_DistB ?=- Upper limit of 68% confidence level of DistB
43- 47 F5.2 mag AVB ?=- Extinction in V band from Bayesian method
49- 53 F5.2 mag b_AVB ?=- Lower limit of 68% confidence level of AVB
55- 59 F5.2 mag B_AVB ?=- Upper limit of 68% confidence level of AVB
61- 64 I4 pc DistD Distance from direct method
66- 69 I4 pc b_DistD Lower limit of 68% confidence level of DistD
71- 75 I5 pc B_DistD Upper limit of 68% confidence level of DistD
77- 81 F5.2 mag AVD Extinction in V band from direct method
83- 87 F5.2 mag b_AVD Lower limit of 68% confidence level of AVD
89- 93 F5.2 mag B_AVD Upper limit of 68% confidence level of AVD
95-106 A12 --- Phot Filters for which the photometry is available
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-May-2015