J/ApJS/266/18 Double-line spectroscopic binaries from LAMOST (Zheng+, 2023)
Searching for double-line spectroscopic binaries in the LAMOST Medium-Resolution
Spectroscopic survey with deep learning.
Zheng Z., Cao Z., Deng H., Mei Y., Tan L., Wang F.
<Astrophys. J. Suppl. Ser., 266, 18 (2023)>
=2023ApJS..266...18Z 2023ApJS..266...18Z
ADC_Keywords: Binaries, spectroscopic; Spectra, optical; Abundances, [Fe/H]
Keywords: Convolutional neural networks ; Spectroscopic binary stars
Abstract:
Double-line spectroscopic binaries (SB2s) are a vital class of
spectroscopic binaries for studying star formation and evolution.
Searching for SB2s has been a hot topic in astronomy. Although
considerable efforts have been made with fruitful outcomes,
limitations in automation and accuracy still persist. In this study,
we developed a convolutional neural network (CNN) model to search for
SB2 candidates in LAMOST medium-resolution survey (MRS) DR9 v1.0 by
detecting double peaks in the cross-correlation function (CCF). We
first generated a large number of spectra of single stars and binaries
using the iSpec spectral synthesis software
(Blanco-Cuaresma+ 2014A&A...569A.111B 2014A&A...569A.111B &
Blanco-Cuaresma 2019MNRAS.486.2075B 2019MNRAS.486.2075B). The CCFs of these synthesized
spectra were then calculated to form our training set. To efficiently
detect the peaks of the CCFs, we applied a Softmax function-based
noise reduction method. After testing and validation, the model
achieved an accuracy of 97.76% in the testing set and was validated
for more than 90% of the sample in several published SB2 catalogs.
Finally, by applying the model to examine approximately 1.59 million
LAMOST-MRS DR9 spectra, we identified 728 candidate SB2s, including
281 newly discovered ones.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 94 2139 Information of 2139 SB2 candidate spectra,
identified with the CNN and visually inspected
table5.dat 68 36470 Information on the complete table of 36470 SB2
candidates, identified with the CNN
table6.dat 68 728 Information on the 728 SB2 candidates, identified
with the convolutional neural network (CNN) and
visually inspected
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See also:
B/sb9 : SB9: 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004-2014)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/A+A/450/681 : Companions to close sp. binaries (Tokovinin+, 2006)
J/AJ/140/184 : RAVE double-lined spectroscopic binaries (Matijevic+, 2010)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/A+A/566/A98 : The Gaia Benchmark Stars - Library (Blanco-Cuaresma+, 2014)
J/A+A/608/A95 : GES: multi-line spectroscopic binary cand. (Merle+, 2017)
J/AJ/156/45 : M-dwarf multiples in the SDSS-III/APOGEE (Skinner+, 2018)
J/AJ/157/196 : Close companions around young stars (Kounkel+, 2019)
J/A+A/635/A155 : Gaia-ESO Survey SB1 catalogue (Merle+, 2020)
J/A+A/638/A145 : GALAH survey. FGK binary stars (Traven+, 2020)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
J/other/RAA/21.292 : LAMOST Time-Domain survey, first results (Wang+, 2021)
J/MNRAS/510/1515 : Double-lined spectroscopic binaries in M11 (Kovalev+, 2022)
J/A+A/664/A159 : Radial velocities of Galactic SB1s (Mahy+, 2022)
J/ApJS/258/26 : Spectroscopic binaries from LAMOST MRS. I. (Zhang+, 2022)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
12- 20 F9.6 deg DEdeg [-10/78.6] Declination in decimal degrees (J2000)
22- 40 I19 --- GaiaDR3 ? Gaia DR3 source identifier
42- 46 F5.2 mag Gmag [8.4/19.1]? Gaia DR3 G band magnitude
48- 84 A37 --- spFile LAMOST FITS spectrum identifier
86- 91 F6.2 --- S/N [50/524.1] Signal-to-Noise of the spectrum
93- 94 I2 --- Index [1/12] Indicies in the spectrum FITS file
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.6 deg RAdeg Right Ascension (J2000)
12- 21 F10.6 deg DEdeg [-87.3/89.3] Declination (J2000)
23- 41 I19 --- Gaia ? Gaia DR3 source identifier
43- 47 F5.2 mag Gmag [2.2/21.4]? Gaia DR3 G band magnitude
49- 56 F8.2 K Teff [2900/41505]? Effective temperature from Gaia DR3
58- 62 F5.2 [cm/s2] logg [-0.4/5.1]? Log surface gravity from Gaia DR3
64- 68 F5.2 [Sun] [Fe/H] [-4.2/0.8]? Metallicity from Gaia DR3
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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- 10 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
12- 20 F9.6 deg DEdeg [-10/78.6] Declination in decimal degrees (J2000)
22- 40 I19 --- Gaia ? Gaia DR3 source identifier
42- 46 F5.2 mag Gmag [8.4/19.1]? Gaia DR3 G band magnitude
48- 55 F8.2 K Teff [4652/11559]? Effective temperature from Gaia DR3
57- 60 F4.2 [cm/s2] logg [2/4.6]? Log surface gravity from Gaia DR3
62- 66 F5.2 [Sun] [Fe/H] [-3.8/0.71]? Metallicity from Gaia DR3
68 A1 --- New? Newly discovered SB2 candidate ("T": 281 sources)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Aug-2023