J/ApJ/787/110 SAGA: Stromgren survey of seismic KIC stars (Casagrande+, 2014)
Stromgren survey for Asteroseismology and Galactic Archaeology: let the
SAGA begin.
Casagrande L., Aguirre V.S., Stello D., Huber D., Serenelli A.M.,
Cassisi S., Dotter A., Milone A.P., Hodgkin S., Marino A.F., Lund M.N.,
Pietrinferni A., Asplund M., Feltzing S., Flynn C., Grundahl F.,
Nissen P.E., Schonrich R., Schlesinger K.J., Wang W.
<Astrophys. J., 787, 110 (2014)>
=2014ApJ...787..110C 2014ApJ...787..110C
ADC_Keywords: Photometry, uvby ; Stars, giant ; Stars, double and multiple ;
Abundances, [Fe/H] ; Stars, masses ; Surveys
Keywords: Galaxy: stellar content; stars: abundances; stars: distances;
stars: fundamental parameters; stars: oscillations; surveys;
techniques: photometric
Abstract:
Asteroseismology has the capability of precisely determining stellar
properties that would otherwise be inaccessible, such as radii,
masses, and thus ages of stars. When coupling this information with
classical determinations of stellar parameters, such as metallicities,
effective temperatures, and angular diameters, powerful new
diagnostics for Galactic studies can be obtained. The ongoing
Stromgren survey for Asteroseismology and Galactic Archaeology (SAGA)
has the goal of transforming the Kepler field into a new benchmark for
Galactic studies, similar to the solar neighborhood. Here we present
the first results from a stripe centered at a Galactic longitude of
74° and covering latitude from about 8° to 20°, which
includes almost 1000 K giants with seismic information and the
benchmark open cluster NGC 6819. We describe the coupling of classical
and seismic parameters, the accuracy as well as the caveats of the
derived effective temperatures, metallicities, distances, surface
gravities, masses, and radii. Confidence in the achieved precision is
corroborated by the detection of the first and secondary clumps in a
population of field stars with a ratio of 2 to 1 and by the negligible
scatter in the seismic distances among NGC 6819 member stars. An
assessment of the reliability of stellar parameters in the Kepler
Input Catalog is also performed, and the impact of our results for
population studies in the Milky Way is discussed, along with the
importance of an all-sky Stromgren survey.
Description:
Intermediate-band Stromgren uvby photometry was obtained during seven
nights with the Wide Field Camera on the 2.5m Isaac Newton Telescope
on La Palma, during period 2012A.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 177 989 SAGA asteroseismic catalog
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
V/117 : Geneva-Copenhagen Survey of Solar neighbourhood (Holmberg+, 2007)
J/MNRAS/444/392 : Synthetic Stellar Photometry. I. (Casagrande+, 2014)
J/ApJS/215/19 : APOKASC catalog of Kepler red giants (Pinsonneault+, 2014)
J/ApJS/211/2 : Stellar properties of Q1-16 Kepler targets (Huber+, 2014)
J/A+A/572/A34 : Pulsating solar-like stars in Kepler (Garcia+, 2014)
J/A+A/562/A71 : Abundances of solar neighbourhood dwarfs (Bensby+, 2014)
J/ApJS/210/1 : Asteroseismic study of solar-type stars (Chaplin+, 2014)
J/AJ/146/133 : Stellar param. from SDSS-III APOGEE DR10 (Meszaros+, 2013)
J/AJ/146/58 : Eclipse timings for NGC 6819-259 (Jeffries+, 2013)
J/AJ/146/43 : WIYN open cluster study. LV. NGC 6819 (Platais+, 2013)
J/ApJ/767/127 : Asteroseismic solutions for 77 Kepler stars (Huber+, 2013)
J/ApJ/765/L41 : Asteroseismic classification of KIC objects (Stello+, 2013)
J/ApJS/204/24 : Kepler planetary candidates. III. (Batalha+, 2013)
J/ApJ/761/16 : Sun IR colors from Line-Depth Ratios (Casagrande+, 2012)
J/ApJ/749/152 : Asteroseismic analysis of solar-type stars (Mathur+, 2012)
J/AJ/144/24 : The Kepler-INT survey (Greiss+, 2012)
J/A+A/543/A160 : Normalized spectra of 82 Kepler red giants (Thygesen+, 2012)
J/ApJS/199/30 : Eff. temperature scale for KIC stars (Pinsonneault+, 2012)
J/A+A/540/A143 : Red giants oscillations observed by Kepler (Mosser+, 2012)
J/AcA/62/33 : OGLE II red giant eclipsing binary twins (Nataf+, 2012)
J/MNRAS/419/L34 : Surface gravity of late-type stars (Morel+, 2012)
J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)
J/AJ/142/22 : Heavy-element dispersion in M92 (Roederer+, 2011)
J/ApJ/729/L10 : KIC stars properties in NGC 6791 and NGC 6819 (Basu+, 2011)
J/A+A/530/A138 : Geneva-Copenhagen survey re-analysis (Casagrande+, 2011)
J/MNRAS/412/1210 : Kepler asteroseismic targets (Molenda-Zakowicz+, 2011)
J/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)
J/A+A/527/A148 : NGC6397 red giants chemical composition (Lind+, 2011)
J/A+A/525/A131 : Solar-like oscillations in Kepler red giants (Hekker+, 2011)
J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)
J/MNRAS/399/323 : Simulated UVEX colors with reddening (Groot+, 2009)
J/A+A/505/117 : Abundances of red giants in 15 GCs (Carretta+, 2009)
J/AJ/138/159 : NGC 6819 stellar RV and photometry (Hole+, 2009)
J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)
J/A+A/465/357 : Stroemgren phot. in the Draco dSph galaxy (Faria+, 2007)
J/MNRAS/373/13 : Lower main-sequence stars parameters (Casagrande+, 2006)
J/MNRAS/367/1329 : Elemental abundances for 176 stars (Reddy+, 2006)
J/AJ/121/327 : Abundances of Red Clump Stars in NGC6819 (Bragaglia+, 2001)
J/A+AS/117/227 : Dwarf effective temperatures (Alonso+ 1996)
J/A+AS/106/257 : Stroemgren photometry of F and G stars (Olsen 1994)
J/A+AS/104/429 : uvby Photometry of G-type dwarfs (Olsen 1994)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- KIC Kepler Input Catalog designation
8 A1 --- f_KIC [*] Presence of a second signal (1)
10- 15 F6.1 uHz numax [0/2003] Frequency of maximum oscillations power
17- 21 F5.1 uHz e_numax [0/600] Uncertainty in numax
23- 28 F6.2 uHz dnu [0.3/111] Large frequency separation
30- 33 F4.2 uHz e_dnu [0.01/4.1] Uncertainty in dnu
35- 39 F5.2 [Sun] [Fe/H] [-2.5/1] Stroemgren metallicity (2)
41- 44 F4.2 [Sun] e_[Fe/H] [0.1/0.3] Uncertainty in Stroemgren metallicity
46- 49 I4 K Teff [3948/6684] Effective temperature from the
infrared flux method (IRFM)
51- 53 I3 K e_Teff [57/507] Error in Teff
55- 59 F5.2 Rsun Rad [1/69.7] Radius from seismology
61- 65 F5.2 Rsun E_Rad [0.01/22.1] Upper error in Rad
67- 71 F5.2 Rsun e_Rad [0.01/14.3] Lower error in Rad
73- 76 F4.2 Msun Mass [0.7/3.6] Mass from seismology
78- 81 F4.2 Msun E_Mass [0.02/1.8] Upper error in Mass
83- 86 F4.2 Msun e_Mass [0.02/1.5] Lower error in Mass
88- 92 F5.3 [cm/s2] log(g) [0.9/4.3] Log surface gravity from seismology
94- 98 F5.3 [cm/s2] E_log(g) [0.001/0.04] Upper error in log(g)
100-104 F5.3 [cm/s2] e_log(g) [0.001/0.05] Lower error in log(g)
106-114 F9.7 Sun Den [0/0.7] Stellar density in units of
solar density (1.4084g/cm3)
116-124 F9.7 Sun E_Den [0/0.07] Upper error in Den
126-134 F9.7 Sun e_Den [0/0.06] Lower error in Den
136-139 I4 pc Dist [184/6015] Distance from the Sun
141-144 I4 pc E_Dist [4/3164] Upper error in Dist
146-149 I4 pc e_Dist [4/1173] Lower error in Dist
151-155 A5 --- Class Asteroseismic classification (3)
157 I1 --- fm [0/1] Metallicity flag (4)
159 I1 --- fp [0/1] Stroemgren photometry flag (4)
161-165 F5.3 mag b-y [0.2/0.99] Stroemgren b-y index
167-171 F5.3 mag m1 [0.01/0.94] Stroemgren m1 index
173-177 F5.3 mag c1 [0.02/0.6] Stroemgren c1 index
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Note (1):
* = indicates the presence of a second oscillation signal in the Kepler data,
indicating a likely binary (see discussion in Section 3.6 of the paper).
Note (2): Determined as described in Section 3.2 of the paper for stars having
classification 'RGB', 'RC', 'NO'. For stars classified as 'Dwarf'
the Stroemgren metallicity calibration of Casagrande et al. 2011
(J/A+A/530/A138) has been used (with the exception of 5629080 and
7107778, classified as Dwarf but at the base of the RGB, and for
which the same calibration of RGB/RC/NO has been used instead).
Notice that [Fe/H]>0.5dex should not be trusted. Only stars having
both Mflg and Pflg equal 0 should be trusted (see Note 5).
Note (3): Seismic classification, as described in Section 3.4 of the paper,
as follows:
RGB = certain Red Giant Branch.
RC = certain Red Clump.
NO = no reliable distinction between RGB and RC could be made.
Dwarf = dwarf star (from Chaplin et al. 2014, J/ApJS/210/1).
Note (4): Quality flags identifying stars with most reliable Stroemgren
metallicities (stars with both flags equal 0 have more reliable [Fe/H]):
fm = 0 if the Stroemgren metallicity calibration is applied within its
range of applicability (Section 3.2 of the paper).
fp = 0 if photometric errors of Stroemgren u,v,b,y magnitudes are below
photometric fiducials (Section 2.3 and Figure 4 of the paper).
Unreliable Stroemgren u,v,b,y imply unreliable photometric
metallicities.
Stars with both Mflg and Pflg equal 0 have more reliable [Fe/H].
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 14-Oct-2015