J/ApJS/271/12 Carbon stars from LAMOST DR7 (Li+, 2024)
Identification of carbon stars from LAMOST DR7.
Li L., Zhang K., Cui W., Shi J., Ji W., Huo Z., Gao Y., Zhang S., Sun M.
<Astrophys. J. Suppl. Ser., 271, 12 (2024)>
=2024ApJS..271...12L 2024ApJS..271...12L
ADC_Keywords: Stars, carbon; Spectra, optical; Surveys; Magnitudes, absolute;
Colors
Keywords: Carbon stars ; Catalogs ; Sky surveys ; Astrostatistics
Abstract:
Carbon stars are excellent kinematic tracers of galaxies and play
important roles in understanding the evolution of the Galaxy.
Therefore, it is worthwhile to search for them in a large number of
spectra. In this work, we build a new carbon star catalog based on the
Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST) DR7
spectra. The catalog contains 4542 spectra of 3546 carbon stars,
identified through line index and near-infrared color-color diagrams.
Through visual inspection of the spectra, we further subclassify them
into 925 C-H, 384 C-R, 608 C-N, and 1292 Ba stars. However, 437 stars
could not be subclassified due to their low signal-to-noise. Moreover,
by comparing with the LAMOST DR7 pipeline we find 567 more carbon
stars and visually subclassify them. We find that on the J-H versus
H-Ks two-color diagram, C-N stars can be reliably distinguished from
the other three subtypes. Additionally, by utilizing the Gaia
distance, we study the distribution of carbon stars in the H-R diagram
and identify 258 dwarf carbon stars by the criterion MG>5.0mag.
Finally, we present the spatial distribution in Galactic coordinates
of the 3546 carbon stars. The majority of C-N, C-R, and Ba stars are
distributed at low Galactic latitudes, while most C-H and dwarf carbon
stars are distributed at high Galactic latitudes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 111 3546 Carbon stars discovered in LAMOST DR7
table4.dat 64 567 Sub-type of carbon stars marked as "carbon"
by LAMOST DR7 Pipeline
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See also:
III/156 : Cool Galactic Carbon Stars, 2nd Edition (Stephenson 1989)
III/227 : General Catalog of galactic Carbon stars, 3d Ed. (Alksnis+ 2001)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/ApJS/94/687 : Old stellar populations. V. (Worthey+, 1994)
J/ApJS/105/419 : Spectral Atlas of Carbon Stars (Barnbaum+ 1996)
J/A+A/375/366 : Carbon stars from the Hamburg/ESO survey (Christlieb+ 2001)
J/AJ/124/1651 : Faint high-lat. carbon stars SDSS photometry (Margon+, 2002)
J/AJ/127/2838 : Faint high-lat. carbon stars SDSS photometry (Downes+, 2004)
J/A+A/473/143 : Radial velocities of C stars near Gal. plane (Demers+, 2007)
J/ApJ/765/12 : Carbon stars & DQ WDs from SDSS-DR7+DR8 (Green, 2013)
J/other/SCPMA/57.176 : Carbon stars & DZ WDs in SDSS spectra (Si+ 2014)
J/other/RAA/15.1671 : New carbon stars from LAMOST survey (Si+, 2015)
J/ApJS/226/1 : Carbon stars from LAMOST DR2 data (Ji+, 2016)
J/A+A/586/A158 : Binary properties of CH and CEMP stars (Jorissen+, 2016)
J/ApJS/234/31 : Carbon stars from LAMOST using machine learning (Li+, 2018)
J/MNRAS/495/2858 : Carbon stars as standard candles. I. (Ripoche+, 2020)
J/AJ/165/154 : Spectroscopic study of Ba and CEMP-s stars (Goswami+, 2023)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- ObsID [103194/746512153] Observation ID
11- 29 A19 --- LAMOST Star designation (JHHMMSS.ss+DDMMSS.s)
31- 41 F11.7 deg RAdeg Right ascension in decimal degrees (J2000)
43- 52 F10.7 deg DEdeg [-8.3/79] Declination in decimal degrees (J2000)
54- 59 A6 --- Sclass Spectral sub-class as given by LAMOST DR7 pipeline
61- 81 F21.18 mag Gmag [-5.93/13]? Absolute G magnitude
83- 99 F17.15 mag GBP-GRP [0.15/4.6]? Reddening-corrected Gaia DR3 GBP-GRP
magnitude
101-103 F3.1 --- Dwarf [0/1]? 1=dwarf star (258 occurrences);
0=giant (3224 occurrences)
105-111 A7 --- SpType Spectral subtype (1)
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Note (1): Subtype as follows:
Ba = 1292 occurrences
C-H = 925 occurrences
C-N = 608 occurrences
C-R = 284 occurrences
UNKNOWN = carbon stars with no identifiable sub-type (437 occurrences)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- ObsID [7011200/746206116] Observation ID
11- 29 A19 --- LAMOST Star designation (JHHMMSS.ss+DDMMSS.s)
31- 43 F13.9 deg RAdeg Right ascension in decimal degrees (J2000)
45- 56 F12.9 deg DEdeg [-8.8/62.1] Declination in decimal degrees (J2000)
58- 64 A7 --- SpType Spectral sub-type (1)
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Note (1): Subtype as follows:
Ba = 77 occurrences
C-H = 279 occurrences
C-N = 46 occurrences
C-R = 33 occurrences
UNKNOWN = carbon stars with no identifiable sub-type (132 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Apr-2024