J/ApJS/278/46 Orbits of 665 SB2s in Lamost-MRS (Guo+, 2025)
Orbital Parameters of 665 Double-lined Spectroscopic Binaries in the LAMOST
Medium-resolution Survey.
Guo S., Kovalev M., Li J., Lu G., Jia S., Li Z., Li J., Xiong J., Yang M.,
He T., Chen X., Han Z.
<Astrophys. J. Suppl. Ser. 278, 46 (2025)>
=2025ApJS..278...46G 2025ApJS..278...46G (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Radial velocities ; Binaries, orbits
Keywords: spectroscopic binary stars - radial velocity - orbital elements -
periodic orbit - multiple stars - Astronomy data analysis
Abstract:
The period, mass ratio, eccentricity, and other orbital parameters are
fundamental for investigating binary star evolution. However, the
number of binaries with known orbital parameters remains limited.
Utilizing the LAMOST medium-resolution spectroscopic survey, we
derived orbital solutions for 665 SB 2 binaries by fitting the radial
velocities of 1119 SB 2 systems with at least six observations,
employing a modified version of The Joker optimized for SB 2 binaries.
To ensure the reliability of the results, four selection criteria were
applied: reduced chi-square, normalized mean absolute error, maximum
phase gap, and radial velocity distribution metric. After applying
these criteria, 665 reliable orbits were retained. Comparison with
Kepler, TESS, and Zwicky Transient Facility light-curve data shows
excellent agreement, with discrepancies in some cases attributed to
shorter pulsation periods observed in light curves. Additionally, good
consistency is found between our periods and those of SB 1 systems in
Gaia data. These orbital solutions contribute to understanding binary
star evolution and the statistical properties of binary populations.
Description:
Orbital parameters of 665 SB 2 binaries from the LAMOST-MRS survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 195 665 List of the parameters of 665 binary candidates
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- LAMOST LAMOST designation (JHHMMSS.ss+DDMMSS.s)
21- 39 I19 --- GaiaDR3 Gaia DR3 source_id
41- 50 F10.6 deg RAdeg Right ascension (J2000)
52- 60 F9.6 deg DEdeg Declination (J2000)
62 I1 --- FitFlag [1/4] Fit flag (1)
64- 70 F7.3 d Per Period
72- 77 F6.3 d e_Per Uncertainty in P
79- 82 F4.2 --- e Eccentricity
84- 87 F4.2 --- e_e Uncertainty in e
89- 94 F6.2 km/s K1 Radial velocity semi-amplitude of
primary star
96- 99 F4.2 km/s e_K1 Uncertainty in K1
101-106 F6.2 km/s K2 Radial velocity semi-amplitude of
secondary star
108-111 F4.2 km/s e_K2 Uncertainty in K2
113-119 F7.2 km/s v0 Systemic radial velocity
121-124 F4.2 km/s e_v0 Uncertainty in v0
126-130 F5.2 rad omega Argument of periastron
132-135 F4.2 rad e_omega Uncertainty in omega
137-145 F9.3 d t0 Reference epoch for phase = 0; Julian Day
147-151 F5.3 d e_t0 Uncertainty in t0
153-157 F5.2 km/s s Radial velocity jitter
159-163 F5.3 --- q Mass ratio q = m2/m1 = K1/K2
165-169 F5.3 --- e_q Uncertainty in q
171-172 I2 --- N Number of observations
174-177 F4.2 --- MaxPhaseGap Maximum phase gap
179-182 F4.2 --- NMAE Normalized mean absolute error
184-187 F4.2 --- M Metric showing radial velocity distribution
189-191 F3.1 mag dmag Difference in magnitude
193-195 F3.1 mag s_dmag Standard deviation of dmag
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Note (1): Flag as follows:
1 = relatively good fits with NMAE < 0.15 and MaxPhaseGap < 0.35
2 = relatively good fits with NMAE < 0.06 and MaxPhaseGap < 0.45
3 = relatively good fits identified from visual inspection
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Acknowledgements:
Mikhail Kovalev, mikhail.kovalev(at)ynao.ac.cn
(End) Patricia Vannier [CDS] 03-Jul-2025