2024ApJS..274....6H

Query : 2024ApJS..274....6H

2024ApJS..274....6H - Astrophys. J., Suppl. Ser., 274, 6 (2024/September-0)

Identification of Carbon Stars in LAMOST DR9 Based on Deep Learning.

HE Y., CAO Z., DENG H., WANG F., MEI Y. and TAN L.

Abstract (from CDS):

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.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Carbon stars - Stellar classification - Convolutional neural networks

VizieR on-line data: <Available at CDS (J/ApJS/274/6): table5.dat table6.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2

Query : 2024ApJS..274....6H

Basic data :
NGC 300 -- Galaxy towards a Group of Galaxies
Other object types: otypes_help 		G (2014AJ,AM,...), GiG (2007ApJ,[CHM2007]), AG? (2020MNRAS), * (Gaia), HI (HIPASS), IR (IRAS)
ICRS coord. (ep=J2000) : 		00 54 53.4465638304 -37 41 03.168402396 (Optical) [ 0.3398 0.2240 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		00 52 31.7320546625 -37 57 18.217235266 [ 0.3398 0.2240 90 ]
Gal coord. (ep=J2000) : 		299.2091189795405 -79.4190682505258 [ 0.3398 0.2240 90 ]
Proper motions mas/yr : 		-0.150 -0.872 [0.362 0.350 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 146.0 [2.0] / z(spectroscopic) 0.000487 [0.000007] / cz 146.04 [2.00]
   C 2012AJ....144....4M
Parallaxes (mas): 		0.0206 [0.4929] A 2020yCat.1350....0G
Morphological type: 		Sc D 2012AJ....144....4M
Angular size (arcmin): 		20.89 13.49 114 (Opt) D 2003A&A...412...45P
Fluxes (8) :
U 8.83 [0.06] D 2007ApJS..173..185G
B 8.69 [~] C 1989ESOLV.C......0L
V 8.13 [0.06] D 2007ApJS..173..185G
R 7.46 [~] C 1989ESOLV.C......0L
G 17.803595 [0.004533] C 2020yCat.1350....0G
J 7.039 [0.028] C 2006AJ....131.1163S
H 6.566 [0.040] C 2006AJ....131.1163S
K 6.379 [0.058] C 2006AJ....131.1163S
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 5
: 588 		: 113 Display criteria :

Identifiers (19) :
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NGC 300 ESO-LV 295-0200 2MASX J00545347-3741037 [M98c] 005232.0-375712
AM 0052-375 HIPASS J0054-37 MCG-06-03-005 [VDD93] 3
6dFGS gJ005453.4-374104 IRAS 00525-3757 SGC 005232-3757.2 Gaia DR2 5001350950743544192
6dFGS gJ005454.9-374107 LEDA 3238 SPB 17 Gaia DR3 5001350950743544192
ESO 295-20 LVHIS 005 [CHM2007] LDC 26 J005453.47-3741037

References (1614 between 1850 and 2026) (Total 1614)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 7    Distance : 12    Plx : 1    PM : 1   

   

Observing logs
Herschel : 3    ISO : 34    XMM : 2   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : NGC 300

Link by name to the catalogue in VizieR :

NGC 300 ESO-LV 295-0200 HIPASS J0054-37 IRAS 00525-3757 2MASX J00545347-3741037
Gaia DR2 5001350950743544192 Gaia DR3 5001350950743544192

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