J/ApJS/226/1 Carbon stars from LAMOST DR2 data (Ji+, 2016)
Carbon stars from LAMOST DR2 data.
Ji W., Cui W., Liu C., Luo A., Zhao G., Zhang B.
<Astrophys. J. Suppl. Ser., 226, 1-1 (2016)>
=2016ApJS..226....1J 2016ApJS..226....1J (SIMBAD/NED BibCode)
ADC_Keywords: Stars, carbon ; Photometry, infrared ; Spectroscopy ; Stars, giant
Keywords: catalogs; stars: carbon; stars: statistics; surveys
Abstract:
In this work, we present the new catalog of carbon stars from the
LAMOST DR2 catalog. In total, 894 carbon stars are identified from
multiple line indices measured from the stellar spectra. We are able
to identify the carbon stars by combining the CN bands in the red end
with C2 and other lines. Moreover, we also classify the carbon stars
into spectral sub-types of C-H, C-R, and C-N. These sub-types show
distinct features in the multi-dimensional line indices, implying that
in the future they can be used to identify carbon stars from larger
spectroscopic data sets. While the C-N stars are clearly separated
from the others in the line index space, we find no clear separation
between the C-R and C-H sub-types. The C-R and C-H stars seem to
smoothly transition from one to another. This may hint that the C-R
and C-H stars may not be different in their origins, instead their
spectra look different because of different metallicities. Due to the
relatively low spectral resolution and lower signal-to-noise ratio,
the ratio of 12C/13C is not measured and thus the C-J stars are
not identified.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 98 894 Carbon stars discovered in LAMOST DR2
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See also:
V/149 : LAMOST DR2 catalogs (Luo+, 2016)
III/227 : General Catalog of galactic Carbon stars, 3d Ed. (Alksnis+ 2001)
J/A+A/589/A36 : Carbon stars spectra and photometry values (Gonneau+, 2016)
J/other/RAA/15.1671 : New carbon stars from LAMOST survey (Si+, 2015)
J/ApJ/765/12 : Carbon stars & DQ white dwarfs from SDSS-DR7+DR8 (Green, 2013)
J/A+A/473/143 : RVs of C stars near Galactic plane (Demers+, 2007)
J/AJ/127/2838 : Faint high-latitude carbon stars SDSS photom. (Downes+, 2004)
J/AJ/124/1651 : Faint high-latitude carbon stars SDSS photom. (Margon+, 2002)
J/other/Ap/41.356 : FBS 10th list of red stars (Gigoyan+, 1998)
J/ApJS/105/419 : Spectral Atlas of Carbon Stars (Barnbaum+ 1996)
http://dr2.lamost.org/ : LAMOST DR2 home page
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- specId Observation ID
11- 29 A19 --- LAMOST Designation in the LAMOST DR2 catalogue
(JHHMMSS.ss+DDMMSS.s)
31- 41 F11.7 deg RAdeg Right Ascension in decimal degrees (J2000)
43- 52 F10.7 deg DEdeg Declination in decimal degrees (J2000)
54- 59 F6.3 mag Jmag [3.9/15.1] 2MASS J band magnitude
61- 66 F6.3 mag Hmag [2.5/14.5] 2MASS H band magnitude
68- 73 F6.3 mag Ksmag [1.6/14.5] 2MASS KS band magnitude
75- 81 A7 --- SpT Spectrum sub-type (1)
83- 85 A3 --- OType Object type from SIMBAD (2)
87- 92 F6.3 mag Hmu [-5/14.2]?=99.999 Reduced proper motion (3)
94- 98 A5 --- Evol Evolution phase; ("Dwarf"=83 sources or
blank = Giant)
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Note (1): From LAMOST DR2 catalog. Spectral sub-type as follows:
C-N = No flux at λ<4400Å; some very late type C-Ns can be flat
even at λ<5000Å and strong BaII at 6496Å and
weak Hα (108 sources).
C-H = Strong G band (CH) and strong CN at 4215Å and weak Ca at 4227Å
and strong BaII at 4554Å or 6496Å and strong Hα
(339 sources).
C-R = Strong CN at 4215Å and strong Ca at 4227Å and
weak BaII at 4554Å relatively weak BaII at 6496Å compared
to Hα (259 sources).
C? = Suspect carbon stars (104 sources);
Unknown = Carbon star with no identifiable sub-type (84 sources).
See section 4.1 for further explanations.
Note (2): Stars with an "*" indicate Carbon stars marked in SIMBAD with
no sub-types identified. HB? = Possible Horizontal Branch Star.
Note (3): Where Hmu=Ksmag+5*log(µα2+µδ2)0.5-10.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Oct-2016