J/ApJS/269/41 New SB1s with sp. orbits from LAMOST DR8 LRS (Chen+, 2023)
New SB1s with spectroscopic orbits from LAMOST-LRS.
Chen Y., Xia F., Wang X., Fu Y., Yuan Ye
<Astrophys. J. Suppl. Ser., 269, 41 (2023)>
=2023ApJS..269...41C 2023ApJS..269...41C
ADC_Keywords: Binaries, spectroscopic; Radial velocities; Spectra, optical;
Abundances, [Fe/H]; Binaries, orbits
Keywords: Spectroscopic binary stars ; Catalogs ; Radial velocity ;
Orbit determination
Abstract:
The LAMOST Low-Resolution Spectroscopic (LAMOST-LRS) Survey provides
radial velocities of 10 million stars. These observations can be used
to identify new single-lined spectroscopic binaries (SB1s) with their
preliminary spectroscopic orbits. First, we perform a statistical
χ2 test on a subsample of LAMOST-LRS stars with velocity
observations sufficient for the present work to obtain a set of
6852 radial velocity variables. Subsequently, we discard
399 astrophysical variables through crossmatching with variable
catalogs, resulting in 1297 SB1 candidates. Finally, in order to
reliably identify SB1s among these SB1 candidates, we employ a
combination of The joker, rvfit, and Levenberg-Marquardt algorithms to
give the best-fit solutions. An SB1 is identified if its orbital
solution satisfies the criteria of the goodness-of-fit statistic
(F2)<3.1, the signal significance >10, and the maximum gap in phase
(phasegapmax)<0.3. Our final catalog of SB1s contains 255 systems,
168 of which are newly discovered ones. Cross validation results
indicate that the determined orbital periods are consistent with
periods of external catalogs within 1σ uncertainties. The
period-eccentricity diagram illustrates that a majority of
short-period binaries have small eccentricities. Furthermore, in
comparison to the general sample, the SB1 catalog exhibits a
relatively higher ratio of dwarfs than giants and a slightly lower
metallicity.
Description:
In the present paper, we use the LAMOST DR8 v2 LRS (R∼1800 at 550nm)
data, which were obtained from October 2011 to 2020 June. There are
about 10.3 million stellar spectra, of which 9.3 million have a
signal-to-noise ratio (S/N) greater than 10 in the g or i bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 146 1297 Summary information for sample II (SB1 candidates)
table2.dat 268 255 Summary information for 255 SB1s (Section 4)
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See also:
B/sb9 : SB9: 9th Catalog of Spectroscopic Binary Orbits (Pourbaix+ 2004-2014)
B/gcvs : General Catalog of Variable Stars (Samus+, 2007-2017)
II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
J/A+A/498/627 : Radial velocities of SB with M giant (Famaey+, 2009)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/MNRAS/424/1925 : Spectroscopic Binarity of O & B type stars (Chini+, 2012)
J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)
J/AJ/150/10 : WOCS. LXVI. Radial velocity survey in M35 (Leiner+, 2015)
J/AJ/158/155 : SB cand. from the RAVE & Gaia DR2 surveys (Birko+, 2019)
J/other/RAA/19.64 : LAMOST sp. binaries & variable stars (Qian+, 2019)
J/ApJS/244/43 : Binary stars param. from LAMOST & Kepler (Zhang+, 2019)
J/A+A/635/A155 : Gaia-ESO Survey SB1 catalogue (Merle+, 2020)
J/ApJS/249/22 : RV variable stars from LAMOST DR4 (Tian+, 2020)
J/A+A/638/A145 : GALAH survey. FGK binary stars (Traven+, 2020)
J/other/RAA/21.292 : LAMOST Time-Domain survey, first results (Wang+, 2021)
J/A+A/659/A95 : Survey of Surveys. I. Radial velocities (Tsantaki+, 2022)
J/ApJS/258/26 : Spectroscopic binaries from LAMOST MRS. I. (Zhang+, 2022)
http://www.lamost.org/dr8/v2.0/ : LAMOST DR8 v2.0 home page
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 Target designation (JHHMMSS.ss+DDMMSS.s)
21- 39 I19 --- Gaia ?=-9999 Gaia DR3 catalog identifier
41- 50 F10.6 deg RAdeg [38/298] Right Ascension (J2000)
52- 60 F9.6 deg DEdeg [2/50] Declination (J2000)
62- 69 F8.2 mag Gmag [9/17]?=-9999 Gaia DR3 G band magnitude
71- 78 F8.2 [Sun] [Fe/H] [-2.5/1]?=-9999 LAMOST LASP metallicity
80- 84 I5 K Teff [3677/13175]?=-9999 LAMOST LASP effective
temperature
86- 93 F8.2 [cm/s2] logg [1/5]?=-9999 LAMOST LASP log surface gravity
95- 101 F7.2 d Span [56.9/2939] Time span of the observation
103- 109 F7.1 km/s DelVmax [9/48186] Difference between highest/lowest
radial velocities
111- 117 F7.2 d Delt [0.06/2933] Time difference between
highest/lowest radial velocities
119- 124 F6.1 km/s RV [-242/2628] Weighted radial velocity
126- 127 I2 --- Nrv [12/35] Number of radial velocity measurements
129- 139 F11.1 --- chi2 [31/105855626] The χ2 value from
Equation 1
141- 146 F6.1 --- F2 [3/1706] Value from Equation 2 (G1)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 d Per [0.2/829] Orbital period
10- 15 F6.4 d e_Per [0/7] Uncertainty in Per
17- 28 F12.4 d t0 [2455910.3/2458424.4] Reference time;
Julian Date
30- 35 F6.4 rad M0 [0/6.3] Mean anomaly at t0
37- 48 F12.4 rad e_M0 [0/2] Uncertainty in M0
50- 53 F4.2 --- e [0/1] Orbital eccentricity
55- 58 F4.2 --- e_e [0/0.2] Uncertainty in e
60- 63 F4.2 rad omega [0/6.3] Argument of pericenter
65- 74 F10.2 rad e_omega [0/2] Uncertainty in omega
76- 82 F7.2 km/s gamma [-209/241] Systemic velocity
84- 87 F4.2 km/s e_gamma [0.04/5] Uncertainty in gamma
89- 94 F6.2 km/s K [3.3/598] Velocity semi-amplitude
96- 100 F5.2 km/s e_K [0.06/20] Uncertainty in K
102- 106 F5.2 Msun f(M) [0/11.1] Mass function
108- 111 F4.1 --- chi2Orb [0.1/44] Objective function from equation 3
113- 116 F4.1 --- F2Orb [-5.1/3] Goodness of fits statistic;
Section 4.2
118- 123 F6.2 --- Sig [10/494] Significance of the solution from
Equation 8
125- 128 F4.2 --- PGmax [0.07/0.3] Maximum gap in phase
130 I1 --- New [0/1] Flag on new SB1s: 1=new or 0=old
132- 150 A19 --- LAMOST Target designation (JHHMMSS.ss+DDMMSS.s)
152- 170 I19 --- Gaia Gaia DR3 catalog identifier
172- 181 F10.6 deg RAdeg [38/168] Right Ascension (J2000)
183- 191 F9.6 deg DEdeg [2/29] Declination (J2000)
193- 197 F5.2 mag Gmag [10.27/17] Gaia DR3 G band magnitude
199- 206 F8.2 [Sun] [Fe/H] [-2/0.4]?=-9999 LAMOST LASP metallicity
208- 212 I5 K Teff [4032/11061]?=-9999 LAMOST LASP effective
temperature
214- 221 F8.2 [cm/s2] logg [1.4/5]?=-9999 LAMOST LASP log surface gravity
223- 229 F7.2 d Span [56/2939] Time span of the observation
231- 236 F6.1 km/s DelVmax [13/1197] Difference between highest/lowest
radial velocities
238- 244 F7.2 d Delt [2/2644] Time difference between
highest/lowest radial velocities
246- 251 F6.1 km/s RV [-206/240] Weighted radial velocity
253- 254 I2 --- Nrv [12/34] Number of radial velocity measurements
256- 262 F7.1 --- chi2 [31/33512] The χ2 value from Equation 1
264- 268 F5.1 --- F2 [3/107] Value from Equation 2 (G1)
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Global notes:
Note (G1): F2 is given by the following formula:
F2=(9ν/2)0.5[(χ2/ν)1/3+(2/9ν)-1]; with
ν=N-1 degrees of freedom
The F2 distribution of the sample is shown in Figure 2.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Feb-2024