J/other/RAA/15.1154 M-giant star candidates in LAMOST DR 1 (Zhong+, 2015)
M-giant star candidates identified in LAMOST DR 1.
Zhong J., Lepine S., Li J., Chen L., Hou J.-L., Yang M., Li G.-W.,
Zhang Y., Hou Y.-H.
<Res. Astron. Astrophys., 15, 1154-1165 (2015)>
=2015RAA....15.1154Z 2015RAA....15.1154Z (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Stars, dwarfs ; Photometry ;
MK spectral classification
Keywords: stars: fundamental parameters - stars: late-type - catalogs - surveys
Abstract:
We perform a discrimination procedure with the spectral index diagram
of TiO5 and CaH2+CaH3 to separate M giants from M dwarfs. Using
the M giant spectra identified from LAMOST DR1 with high
signal-to-noise ratio, we have successfully assembled a set of M giant
templates, which show more reliable spectral features. Combining with
the M dwarf/subdwarf templates in Zhong et al. (2015AJ....150...42Z 2015AJ....150...42Z,
Cat. J/AJ/150/42), we present an extended library of M-type templates
which includes not only M dwarfs with a well-defined temperature and
metallicity grid but also M giants with subtypes from M0 to M6. Then,
the template-fitting algorithm is used to automatically identify and
classify M giant stars from LAMOST DR1. The resulting catalog of M
giant stars is cross-matched with 2MASS JHKs and WISE W1/W2 infrared
photometry. In addition, we calculated the heliocentric radial
velocity of all M giant stars by using the cross-correlation method
with the template spectrum in a zero-velocity rest frame. Using the
relationship between the absolute infrared magnitude MJ and our
classified spectroscopic subtype, we derived the spectroscopic
distance of M giants with uncertainties of about 40%. A catalog of
8639 M giants is provided. As an additional result of this analysis,
we also present a catalog of 101690 M dwarfs/subdwarfs which are
processed by our classification pipeline.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
mdwarfs.dat 142 101690 M dwarf catalog in LAMOST DR1
mgiants.dat 139 8639 M giant catalog in LAMOST DR1
mtemp.dat 92 5001 M giant templates for MK classification
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See also:
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
J/AJ/150/42 : Catalog of 2612 M dwarfs from LAMOST (Zhong+, 2015)
Byte-by-byte Description of file: mdwarfs.dat mgiants.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Designation in LAMOST DR1, JHHMMSS.ss+DDMMSS.s
22- 31 F10.6 deg RAdeg Right ascension J2000
34- 43 F10.6 deg DEdeg Declination J2000
46- 51 F6.1 mas/yr pmRA ?=- Proper motion in RA*cos(DE) from the
PPMXL catalog
54- 59 F6.1 mas/yr e_pmRA ?=- Mean error in pmRA from the PPMXL catalog
62- 67 F6.1 mas/yr pmDE ?=- Proper motion in DE from the PPMXL catalog
70- 75 F6.1 mas/yr e_pmDE ?=- Mean error in pmDE from the PPMXL catalog
79- 84 F6.3 mag Jmag ?=- J magnitude from the 2MASS catalog
87- 92 F6.3 mag Hmag ?=- H magnitude from the 2MASS catalog
95-100 F6.3 mag Ksmag ?=- Ks magnitude from the 2MASS catalog
103-108 F6.3 mag W1mag ?=- W1 magnitude from the WISE catalog
111-116 F6.3 mag W2mag ?=- W2 magnitude from the WISE catalog
119-124 F6.1 km/s RV ?=- Radial velocity
127-132 F6.2 kpc Dist ?=- Spectroscopic distance base on the
absolute magnitude(MJ)
135-142 A8 --- SpType Spectral subtype classified by the template
fit pipeline
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Byte-by-byte Description of file: mtemp.dat
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Bytes Format Units Label Explanations
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2- 8 F7.3 nm lambda Wavelength
11- 20 E10.4 ---- FM0 Normalized Flux for gM0 type
23- 32 E10.4 ---- FM1 Normalized Flux for gM1 type
35- 44 E10.4 ---- FM2 Normalized Flux for gM2 type
47- 56 E10.4 ---- FM3 Normalized Flux for gM3 type
59- 68 E10.4 ---- FM4 Normalized Flux for gM4 type
71- 80 E10.4 ---- FM5 Normalized Flux for gM5 type
83- 92 E10.4 ---- FM6 Normalized Flux for gM6 type
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Nov-2015