J/MNRAS/448/822 LAMOST candidate members of star clusters (Xiang+, 2015)
The LAMOST stellar parameter pipeline at Peking University - LSP3.
Xiang M.S., Liu X.W., Yuan H.B., Huang Y., Huo Z.Y., Zhang H.W., Chen B.Q.,
Zhang H.H., Sun N.C., Wang C., Zhao Y.H., Shi J.R., Luo A.L., Li G.P.,
Wu Y., Bai Z.R., Zhang Y., Hou Y.H., Yuan H.L., Li G.W., Wei Z.
<Mon. Not. R. Astron. Soc., 448, 822-854 (2015)>
=2015MNRAS.448..822X 2015MNRAS.448..822X (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Effective temperatures ;
Radial velocities ; Abundances, [Fe/H]
Keywords: techniques: radial velocities - techniques: spectroscopic - surveys -
stars: abundance - stars: fundamental parameters - Galaxy: disc
Abstract:
We introduce the Large Sky Area Multi-Object Fiber Spectroscopic
Telescope (LAMOST) stellar parameter pipeline at Peking University -
LSP3, developed and implemented for the determinations of radial
velocity Vr and stellar atmospheric parameters (effective temperature
Teff, surface gravity logg, metallicity [Fe/H]) for the LAMOST
Spectroscopic Survey of the Galactic Anticentre (LSS-GAC). We describe
the algorithms of LSP3 and examine the accuracy of parameters yielded
by it. The precision and accuracy of parameters yielded are
investigated by comparing results of multi-epoch observations and of
candidate members of open and globular clusters, with photometric
calibration, as well as with independent determinations available from
a number of external data bases, including the PASTEL archive, the
APOGEE, SDSS and RAVE surveys, as well as those released in the LAMOST
DR1. The uncertainties of LSP3 parameters are characterized and
quantified as a function of the spectral signal-to-noise ratio (SNR)
and stellar atmospheric parameters. We conclude that the current
implementation of LSP3 has achieved an accuracy of 5.0km/s, 150K,
0.25dex, 0.15dex for the radial velocity, effective temperature,
surface gravity and metallicity, respectively, for LSS-GAC spectra of
FGK stars of SNRs per pixel higher than 10. The LSP3 has been applied
to over a million LSS-GAC spectra collected hitherto. Stellar
parameters yielded by the LSP3 will be released to the general public
following the data policy of LAMOST, together with estimates of the
interstellar extinction E(B-V) and stellar distances, deduced by
combining spectroscopic and multiband photometric measurements using a
variety of techniques.
Description:
In this work, we describe the algorithms and implementation of LSP3,
the LAMOST Stellar Parameter Pipeline at Peking University, a
pipeline developed to determine the stellar parameters (radial
velocity Vr, effective temperature Teff, surface gravity logg and
metallicity [Fe/H]) from LAMOST spectra based on a template-matching
technique.
Following the data policy of LAMOST surveys, the data as well as the
LSP3 pipeline will be public released as value-added products of the
first data release of LAMOST (LAMOST DR1; Bai et al., 2015, A&A
submitted), currently scheduled in 2014 December and can be accessed
via http://lamost973.pku.edu.cn/site/node/4, along with a description
file.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 62 178 Candidate members of star clusters observed
with the LAMOST
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Cluster Cluster name
13- 22 F10.6 deg RAdeg Right ascension (J2000.0)
24- 32 F9.6 deg DEdeg Declination (J2000.0)
34- 39 F6.1 K Teff Effective temperature
41- 44 F4.2 [cm/s2] logg Surface gravity
46- 50 F5.2 [-] [Fe/H] Metallicity
52- 56 F5.1 km/s RV Radial velocity
58- 62 F5.1 --- S/N Signal-to-noise ratio
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Aug-2015