J/AJ/146/133 Stellar parameters from SDSS-III APOGEE DR10 (Meszaros+, 2013)
Calibrations of atmospheric parameters obtained from the first year of SDSS-III
APOGEE observations.
Meszaros Sz., Holtzman J., Garcia Perez A.E., Allende Prieto C.,
Schiavon R.P., Basu S., Bizyaev D., Chaplin W.J., Chojnowski S.D.,
Cunha K., Elsworth Y., Epstein C., Frinchaboy P.M., Garcia R.A.,
Hearty F.R., Hekker S., Johnson J.A., Kallinger T., Koesterke L.,
Majewski S.R., Martell S.L., Nidever D., Pinsonneault M.H., O'Connell J.,
Shetrone M., Smith V.V., Wilson J.C., Zasowski G.
<Astron. J., 146, 133 (2013)>
=2013AJ....146..133M 2013AJ....146..133M
ADC_Keywords: Clusters, globular ; Clusters, open ; Stellar distribution ;
Abundances ; Effective temperatures
Keywords: stars: abundances - stars: fundamental parameters - surveys
Abstract:
The Sloan Digital Sky Survey III (SDSS-III) Apache Point Observatory
Galactic Evolution Experiment (APOGEE) is a three-year survey that is
collecting 105 high-resolution spectra in the near-IR across
multiple Galactic populations. To derive stellar parameters and
chemical compositions from this massive data set, the APOGEE Stellar
Parameters and Chemical Abundances Pipeline (ASPCAP) has been
developed. Here, we describe empirical calibrations of stellar
parameters presented in the first SDSS-III APOGEE data release (DR10).
These calibrations were enabled by observations of 559 stars in 20
globular and open clusters. The cluster observations were supplemented
by observations of stars in NASA's Kepler field that have well
determined surface gravities from asteroseismic analysis. We discuss
the accuracy and precision of the derived stellar parameters,
considering especially effective temperature, surface gravity, and
metallicity; we also briefly discuss the derived results for the
abundances of the α-elements, carbon, and nitrogen. Overall, we
find that ASPCAP achieves reasonably accurate results for temperature
and metallicity, but suffers from systematic errors in surface
gravity. We derive calibration relations that bring the raw ASPCAP
results into better agreement with independently determined stellar
parameters. The internal scatter of ASPCAP parameters within clusters
suggests that metallicities are measured with a precision better than
0.1dex, effective temperatures better than 150K, and surface gravities
better than 0.2dex. The understanding provided by the clusters and
Kepler giants on the current accuracy and precision will be invaluable
for future improvements of the pipeline.
Description:
The Sloan Digital Sky Survey III (SDSS-III) Apache Point Observatory
Galactic Evolution Experiment (APOGEE) is a three-year survey that is
collecting 105 high-resolution spectra in the near-IR across
multiple Galactic populations. SDSS-III APOGEE observed 20 open and
globular clusters during the first year of survey operations. To
derive stellar parameters and chemical compositions from this massive
data set, the APOGEE Stellar Parameters and Chemical Abundances
Pipeline (ASPCAP) has been developed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 130 559 Properties of stars used for validation of ASPCAP
(APOGEE Stellar Parameters and Chemical Abundances
Pipeline) (2015-03-12 version)
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
J/AJ/142/59 : Chemical abundance in 10 open clusters (Jacobson+, 2011)
J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)
J/A+A/497/497 : Physical parameters from JHK flux (Gonzalez-Hernandez+, 2009)
J/A+A/511/A56 : Abundances of five open clusters (Pancino+, 2010)
J/AJ/139/2289 : Abundances of five red giants in M5 (Koch+, 2010)
J/ApJ/689/1031 : Heavy element abundances in giant stars (Yong+, 2008)
J/A+A/431/933 : Abundances of NGC 7789 evolved stars (Tautvaisiene+, 2005)
J/AJ/129/303 : Abundances of stars in M3 and M13 (Cohen+, 2005)
J/AJ/121/327 : Abundances of Red Clump Stars in NGC6819 (Bragaglia+, 2001)
J/A+A/360/499 : Equivalent widths of 9 stars of M 67 (Tautvaisiene+, 2000)
J/AJ/120/1364 : Abundances in M3 and M13 (Cavallo+, 2000)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [2M]
3- 18 A16 --- 2MASS The 2MASS identifier (JHHMMSSss+DDMMSSs) (1)
20- 27 A8 --- Cluster Cluster identifier (2)
29- 35 F7.2 km/s HRV Heliocentric radial velocity
37- 42 F6.1 K Teff1 ASPCAP effective temperature TA
44- 49 F6.1 K Teff2 ?=0 Corrected effective temperature Tcor (3)
51- 54 F4.2 [cm/s2] logg1 log ASPCAP surface gravity log.gA
56- 60 F5.2 [cm/s2] logg2 ?=0 Corrected surface gravity log.gcor (3)
62- 66 F5.2 [Sun] [M/H]1 ASPCAP metallicity [M/H]A
68- 72 F5.2 [Sun] [M/H]2 ?=0 Corrected metallicity [M/H]cor (3)
74- 78 F5.2 [Sun] [C/M] ASPCAP carbon abundance
80- 84 F5.2 [Sun] [N/M] ASPCAP nitrogen abundance
86- 90 F5.2 [Sun] [a/M] ASPCAP α abundance
92- 97 F6.1 --- S/N [72/1251] Signal-to-noise
99-104 F6.3 mag Jmag ?=0 2MASS J band magnitude
106-111 F6.3 mag Hmag 2MASS H band magnitude
113-118 F6.3 mag Kmag ?=0 2MASS Ks band magnitude
120-124 F5.1 K e_Teff2 ?=0 The 1σ error in Teff2
126-130 F5.3 [Sun] e_[M/H]2 ?=0 The 1σ error in [M/H]2
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Note (1): After the SDSS-III Apache Point Observatory Galactic Evolution
Experiment (APOGEE) DR10 was published we discovered that four stars had
double entries with identical numbers in this table (those are deleted
from this table, thus providing 559 stars). All calibration equations were
derived with those four double entries in our tables, but because DR10 is
already published we decided not to change the fitting equations in this
paper. This problem does not affect the effective temperature correction.
The changes in the other fitting equations are completely negligible and
have no affect in any scientific application. The parameters published in
DR10 are off by <1K in case of the effective temperature error correction,
and by <0.001dex for the metallicity, metallicity error, and surface
gravity correction.
Note (2): M107, M13, M15, M2, M3, M35, M5, M53, M67, M71, M92, N188, N2158,
N2420, N4147, N5466, N6791, N6819, N7789, Pleiades.
Note (3): corrected to match the scale used in the literature:
Tcor = 0.6032TA + 1938.3 (Tcor matches the scale used by
Gonzalez Hernandez and Bonifacio 2009, J/A+A/497/497
between 4600 and 5500K)
[M/H]cor = [M/H]A + 0.06199[M/H]A2 - 1.125x10-4TA
+ 4.734x10-5TA.[M/H]A + 0.544
log.gcor = log.gA + 0.1222[M/H]A - 0.2396
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History:
* 21-Jul-2014: from electronic version of the journal
* 12-Mar-2015: 54 2MASS names in the Pleiades corrected from author
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 21-Jul-2014