J/ApJS/274/6 Carbon stars from LAMOST DR9 with deep learning (He+, 2024)
Identification of carbon stars in LAMOST DR9 based on deep learning.
He Y., Cao Z., Deng H., Wang F., Mei Y., Tan L.
<Astrophys. J. Suppl. Ser., 274, 6 (2024)>
=2024ApJS..274....6H 2024ApJS..274....6H
ADC_Keywords: Stars, carbon; Spectra, optical; Surveys; Spectral types
Keywords: Carbon stars ; Stellar classification ; Convolutional neural networks
Abstract:
Carbon stars play a crucial role in astronomical research and are
significant for understanding stellar evolution, measuring cosmic
distances, and studying galaxy kinematics. In recent years,
identifying carbon stars using machine learning methods and
traditional line-index methods has become a research hotspot, but
there are still limitations regarding accuracy and automation. In this
study, we propose to build a five-class model to identify carbon stars
using spectral data from LAMOST DR9. The model achieved 99.45%
precision and 91.21% recall on the carbon star testing set. We
conducted independent tests using a sample of 1333 known carbon stars
that were not used in the training and testing phases, and our model
ultimately identified 1199 carbon stars. On this basis, we used this
model to screen 11,226,252 spectra of LAMOST DR9 and identified
4383 carbon stars, including 1197 newly discovered carbon stars. To
gain a more comprehensive understanding of the characteristics of the
4383 carbon stars obtained, further visual inspection of these spectra
was performed to provide more detailed carbon star subtypes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 80 4146 Information of 4146 carbon stars from other catalogs
table6.dat 81 4383 Information of 4383 carbon stars reported
in this paper
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See also:
III/156 : Cool Galactic Carbon Stars, 2nd Edition (Stephenson 1989)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
J/AJ/109/2480 : VI photometry of late-type stars in M31. I. (Brewer+ 1995)
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-latitude carbon stars SDSS phot. (Margon+, 2002)
J/AJ/127/2838 : Faint high-latitude carbon stars SDSS phot. (Downes+, 2004)
J/AJ/129/729 : CCD photometry of luminous stars in M33 (Rowe+, 2005)
J/A+A/473/143 : Radial velocities of C stars near Gal. plane (Demers+, 2007)
J/ApJ/765/12 : Carbon stars and 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/ApJS/234/31 : Carbon stars from LAMOST using machine learning (Li+, 2018)
J/ApJS/244/8 : M-type stars in LAMOST DR5 (Zhong+, 2019)
J/A+A/664/A45 : Characterisation of Galactic carbon stars (Abia+, 2022)
J/ApJS/266/4 : LAMOST DR9 M-giant stars value-added cat. (Li+, 2023)
J/ApJS/271/12 : Carbon stars from LAMOST DR7 (Li+, 2024)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- LAMOST Designation of star (JHHMMSS.ss+DDMMSS.s)
21- 29 I9 --- OBSID [205058/914111200] OBSID of star
31- 40 F10.6 deg RAdeg Right ascension in decimal degrees (J2000)
42- 50 F9.6 deg DEdeg Declination in decimal degrees (J2000)
52- 57 F6.2 --- SNR-g [10/500] Signal-to-noise ratio in g-band
59- 64 F6.2 --- SNR-i [10.6/999] Signal-to-noise ratio in i-band
66- 75 A10 --- Subclass Subclass of star
77- 80 A4 --- Ref Source catalog (1)
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Note (1): If a carbon star has multiple different source catalogs, the catalog
with the earliest publication date is labeled as the source catalog.
References as follows:
D04 = Dowens et al. (2004, J/AJ/127/2838)
J16 = Ji et al. (2016, J/ApJS/226/1)
L18 = Li et al. (2018, J/ApJS/234/31)
L23 = Li et al. (2023, J/ApJS/266/4)
L23b = Lebzelter et al. (2023A&A...674A..15L 2023A&A...674A..15L)
L24 = Li et al. (2024, J/ApJS/271/12)
S14 = Si et al. (2014, J/other/SCPMA/57.176)
S15 = Si et al. (2015, J/other/RAA/15.1671)
Z19 = Zhong et al. (2019, J/ApJS/244/8)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- LAMOST Designation of star (JHHMMSS.ss+DDMMSS.s)
21- 29 I9 --- OBSID [603215/914111200] OBSID of star
31- 40 F10.6 deg RAdeg Right ascension in decimal degrees (J2000)
42- 50 F9.6 deg DEdeg Declination in decimal degrees (J2000)
52- 57 F6.2 --- SNR-g [10/661] Signal-to-noise ratio in g-band
59- 64 F6.2 --- SNR-i [10.6/999] Signal-to-noise ratio in i-band
66- 71 A6 --- Subclass Subclass of star
73- 79 A7 --- SubType Subtype of carbon star
81- 81 A1 --- New [*] *: newly discovered carbon star
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Jan-2025