J/AJ/169/139 10 contact binaries radial velocities & time of minima (Xia+, 2025)
Minute-cadence observations of the LAMOST fields with the TMTS.
VI. Physical parameters of contact binaries.
Xia Q., Wang X., Li K., Gao X., Guo F., Lin J., Liu C., Mo J., Peng H.,
Liu Q., Xi G., Yan S., Jiang X., Zhang J., Song C.-Y., Shi J., Ma X.,
Xiang D., Li W.
<Astron. J., 169, 139 (2025)>
=2025AJ....169..139X 2025AJ....169..139X
ADC_Keywords: Radial velocities; Stars, double and multiple; Photometry; Optical
Keywords: Contact binary stars ; Close binary stars ; Stellar evolution ;
Star formation ; Late-type stars ; Starspots
Abstract:
With the development of wide-field surveys, a large amount of data on
short-period W UMa contact binaries have been obtained. Continuous and
uninterrupted light curves as well as high-resolution spectroscopic
data are crucial in determining the absolute physical parameters.
Targets with both TMTS light curves and LAMOST medium-resolution
spectra were selected. The absolute physical parameters were inferred
with the W-D code for 10 systems, all of them are W-type shallow or
medium contact binaries. The O'Connell effect observed in the light
curves can be explained by adding a spot on the primary or secondary
component in the models. According to O-C analysis, the orbital
periods exhibit a long-term increasing or decreasing trend, among
which J0132, J1300, and J1402 show periodic variations that may be
attributed to the presence of a third body or magnetic activity
cycles. Spectral subtraction analysis revealed that the equivalent
width of Hα indicates strong magnetic activity in J0047, J0305,
J0638, and J1402. Among the 10 selected binary systems, except for
J0132 and J0913, the more massive components are found to be
main-sequence stars while the less massive components have evolved off
the main sequence. In J0132, both components are in the main sequence,
whereas both components of J0913 lie above the terminal-age main
sequence. Based on the relationship between orbital angular momentum
and total mass for these two systems, as well as their low fill-out
factors, it is possible that these two systems are newly formed
contact binaries, having recently evolved from the detached
configuration.
Description:
The TMTS is located at the Xinglong Station of the National
Astronomical Observatory of China (NAOC), using a multitube telescope
system consisting of four 40cm optical telescopes and a large field of
view (FoV) of approximately 18deg2. Luminous filter (L band
hereafter) was conducted with a wide wavelength range from 390nm to
about 900nm. By the end of 2022, after 2yr of survey, TMTS has
monitored 449 LAMOST/TMTS plates.
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)
is a 4m Schmidt telescope with an FOV of 5deg2. LAMOST medium
resolution survey (MRS) Data Release (DR) 10 was used as the source of
radial velocities (RVs) for the W UMa contact binaries with a
resolution of 7500. For each observed object, two spectra are obtained
within a single exposure, which include a blue (B) side spectrum with
a wavelength range of 4950-5350Å, and a red (R) side spectrum with
a wavelength range of 6300-6800Å.
First, we cross-matched the EW catalog of TMTS with the LAMOST MRS
catalog and filtered according to the following criteria:
- Select targets within an angular radius of 3".
- SNRs of B-band spectra greater than 10.
- Number of consecutive exposures greater than or equal to 3.
After the above selection process, we obtained 57 targets that met the
criteria. We chose targets with at least three phases between 0.2 and
0.3 or 0.7 and 0.8. After that, we visually inspected their light
curves (LCs) again, excluding LCs with insufficient SNR and those
targets that might be ellipsoidal variables. Finally 10 targets were
identified from the LAMOST MRS spectra for subsequent RV calculations.
We also cross-matched these targets with the Variable Star Index (VSX;
Watson+2006, B/vsx), Gaia DR2 (Gaia Collab+2016, I/345), and the
LAMOST DR10 low-resolution (LR) spectra.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 101 10 Photometric observation information of the ten
targets
table3.dat 51 94 Radial velocities of the ten targets
table4.dat 35 1714 Times of minimum for the ten targets
--------------------------------------------------------------------------------
See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)
J/AcA/48/35 : All Sky Automated Survey variable stars (Pojmamski 1998)
J/AJ/119/1901 : ROTSE all-sky surveys for variable stars (Akerlof+, 2000)
J/ApJ/629/1055 : Evolution of close binary systems (Yakut+, 2005)
J/MNRAS/373/1483 : W UMa type and CAB stars dynamical evolution (Eker+, 2006)
J/other/IBVS/5731 : Minima and maxima of 816 variables (Hubscher+, 2006)
J/AJ/133/255 : Light-curve and radial velocities of BD+42 2782 (Lu+, 2007)
J/other/IBVS/5830 : Minima and maxima of 292 variables (Hubscher+, 2008)
J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)
J/other/IBVS/5941 : Minima and maxima of 292 variables (Hubscher+, 2010)
J/other/IBVS/5918 : Minima and maxima of 452 variables (Hubscher+, 2010)
J/ApJ/723/1469 : Flux calibrations and WZ Oph photometry (Wilson+, 2010)
J/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)
J/other/IBVS/5959 : Minima and maxima of 436 variables (Huebscher+, 2011)
J/AJ/141/97 : SDSS DR7 M dwarfs (West+, 2011)
J/other/RAA/11.181 : VR light curves of EI CVn (Yang, 2011)
J/AJ/146/157 : Differential BVRI photometry of FI Boo (Christopoulou+, 2013)
J/AJ/146/35 : BVR light curves of DZ Psc (Yang+, 2013)
J/MNRAS/430/2029 : Initial masses of W UMa contact binaries (Yildiz+, 2013)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/MNRAS/437/185 : W UMa-type contact binaries ages and masses (Yildiz, 2014)
J/AJ/149/120 : Times of minimum light for TY UMa (Li+, 2015)
J/ApJ/812/3 : MEarth mid-to-late M dwarfs rotation & kinematics (West+, 2015)
J/MNRAS/465/4678 : 9380 contact binaries from CRTS VSC (Marsh+, 2017)
J/AJ/154/260 : 3 short-period eclipsing binaries BVRI photometry (Pi+, 2017)
J/AJ/156/241 : A first cat. of variable stars measured by ATLAS (Heinze+, 2018)
J/AJ/156/90 : New cat. of APOGEE radial velocity standard stars (Huang+, 2018)
J/AJ/156/102 : The TESS Input Catalog & Candidate Target List (Stassun+, 2018)
J/ApJS/247/50 : Late-type contact binaries in CSS DR1 (Sun+, 2020)
J/ApJS/246/9 : Stellar parameters of LAMOST stars using SLAM (Zhang+, 2020)
J/ApJS/254/10 : Compilation of W UMa stars (Latkovic+, 2021)
J/ApJ/922/122 : BVRcIc LCs of two contact binaries (Li+, 2021)
J/AJ/162/13 : Parameters estimation for 173 eclipsing binaries (Li+, 2021)
J/AJ/161/221 : Photometry & spectroscopy of 4 binaries stars (Panchal+, 2021)
J/ApJS/256/14 : RVs from LAMOST MRS DR7 stellar spectra (Zhang+, 2021)
J/AJ/164/202 : Extrem. Low Mass Ratio Contact Binar. I. 10 syst. (Li+, 2022)
J/MNRAS/523/2172 : TMTS delta Scuti stars (Lin+, 2023)
J/AJ/165/259 : TESS phot. & radial velocities for 6 K-binaries (Liu+, 2023)
J/MNRAS/528/6997 : Minute-cadence Observations of the TMTS. V. (Guo+, 2024)
J/ApJS/271/32 : ASAS-SN eclipsing contact binaries with Gaia DR3 (Li+, 2024)
http://www.lamost.org/dr10/v1.0/ : LAMOST DR10 (2022)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 22 A22 --- ID Tsinghua University-Ma Huateng Telescopes
for Survey (TMTS; J/MNRAS/528/6997) catalog
identifier
24- 28 A5 --- Name Name of the target
30- 36 F7.3 deg RAdeg Right ascension (J2000)
38- 43 F6.3 deg DEdeg Declination (J2000)
45- 54 A10 "Y:M:D" Date Date of observation (UT)
56- 62 F7.5 d PerTMTS [0.24/0.41] Orbital period from TMTS
(J/MNRAS/528/6997) (1)
64- 70 F7.5 d PerVSX [0.24/0.41] Orbital period from VSX (B/vsx)
72- 77 F6.3 mag Lmag [11.8/14.8] Median L-band (390-900nm)
magnitude from TMTS (J/MNRAS/528/6997)
79- 83 F5.3 mag GMag [3.5/6.2] Absolute Gaia DR2 (I/345) G-band
magnitude
85- 89 F5.3 mag BP-RP [0.6/1.32] BP-RP colour index from Gaia DR2
(I/345)
91 I1 --- nLRS [0/3] Number of exposures from LAMOST DR10
low-resolution (LR) spectra
93- 95 I3 --- nMRS [3/100] Number of exposures from LAMOST DR10
medium-resolution (MR) spectra
97- 101 A5 --- Type Variability type from VSX (B/vsx) (2)
--------------------------------------------------------------------------------
Note (1): The TMTS orbital period given here is obtained by doubling the
photometric period given in Guo+2024 (J/MNRAS/528/6997)
Note (2): Types as follows:
EW = represents the W UMa type eclipsing variables from the International
Variable Star Index (VSX; B/vsx); 10 occurrences
KW = represents contact systems of the W UMa type, with ellipsoidal
components of F0-K spectral type; 1 occurrence
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Name Name of target
7- 17 F11.5 d BJD [58410/59679] Barycentric Julian
Date - 2400000
19- 25 F7.5 --- Phase Phase
27- 33 F7.2 km/s RV1 [-267.8/250.9] Radial velocity of primary
star
35- 38 F4.2 km/s e_RV1 [0.41/6.89] Uncertainty in RV1 (1)
40- 46 F7.2 km/s RV2 [-169.4/181.1]? Radial velocity of secondary
star
48- 51 F4.2 km/s e_RV2 [0.5/4.5]? Uncertainty in RV2 (1)
--------------------------------------------------------------------------------
Note (1): The errors were determined through the cross-correlation functions
(CCFs) procedure.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Name Name of target
7- 17 F11.5 d BJD [51277/59963] Time of minimum;
Barycentric Julian Date - 2400000
19- 25 F7.5 d e_BJD [4e-5/0.007] Uncertainty in BJD
27- 29 A3 --- Method Method used, CCD or photo-electric (pe)
photometry
31- 35 A5 --- Ref Reference (1)
--------------------------------------------------------------------------------
Note (1): References as follows:
1 = Super Wide Angle Search for Planets (superWASP)
2 = Transiting Exoplanet Survey Satellite (TESS)
3 = Tsinghua University-Ma Huateng Telescopes for Survey (TMTS)
4 = Zwicky Transient Facility (ZTF)
5 = Hubscher (2005IBVS.5643....1H 2005IBVS.5643....1H)
6 = Bulletin der Bedeckungsveraenderlichen-Beobachter der Schweizerischen
Astronomischen Gesellschaft Nr.124 (BBSAG124)
7 = Dvorak (2005IBVS.5603....1D 2005IBVS.5603....1D)
8 = Hubscher+ (2005IBVS.5657....1H 2005IBVS.5657....1H)
9 = Hubscher+2006 (J/other/IBVS/5731)
10 = Nelson (2008IBVS.5820....1N 2008IBVS.5820....1N)
11 = Hubscher+2008 (J/other/IBVS/5830)
12 = Diethelm (2009IBVS.5871....1D 2009IBVS.5871....1D)
13 = Diethelm (2010IBVS.5920....1D 2010IBVS.5920....1D)
14 = Hubscher+2010a (J/other/IBVS/5941)
15 = Diethelm (2011IBVS.5960....1D 2011IBVS.5960....1D)
16 = Hubscher & Lehmann (2012IBVS.6026....1H 2012IBVS.6026....1H)
17 = Diethelm (2012IBVS.6011....1D 2012IBVS.6011....1D)
18 = Journal of the American Association of Variable Star Observers (JAAVSO)
19 = Lampens+ (2017IBVS.6230....1L 2017IBVS.6230....1L)
20 = Hubscher (2014IBVS.6118....1H 2014IBVS.6118....1H)
21 = Jurysek+ (2017OEJV..179....1J 2017OEJV..179....1J)
22 = Hubscher (2017IBVS.6196....1H 2017IBVS.6196....1H)
23 = All Sky Automated Survey (ASAS)
24 = Catalina Sky Survey (CSS)
25 = Panchal+2021 (J/AJ/161/221)
26 = All-Sky Automated Survey for Supernovae (ASAS-SN)
27 = Robotic Optical Transient Search Experiment (ROTSE)
28 = Brno Regional Network of Observers (BRNO)
29 = The o-c gateway
30 = Lewandowski+ (2007IBVS.5784....1L 2007IBVS.5784....1L)
31 = Nelson (2007IBVS.5760....1N 2007IBVS.5760....1N)
32 = Nelson (2009IBVS.5875....1N 2009IBVS.5875....1N)
33 = Diethelm (2009IBVS.5894....1D 2009IBVS.5894....1D)
34 = Hubscher+2010b (J/other/IBVS/5918)
35 = Diethelm (2010IBVS.5945....1D 2010IBVS.5945....1D)
36 = Diethelm (2011IBVS.5992....1D 2011IBVS.5992....1D)
37 = Hubscher+ (2012IBVS.6010....1H 2012IBVS.6010....1H)
38 = Honkova+ (2013OEJV..160....1H 2013OEJV..160....1H)
39 = Diethelm (2012IBVS.6029....1D 2012IBVS.6029....1D)
40 = Hubscher+ (2013IBVS.6048....1H 2013IBVS.6048....1H)
41 = Nelson (2013IBVS.6050....1N 2013IBVS.6050....1N)
42 = Honkova+ (2014OEJV..165....1H 2014OEJV..165....1H])
43 = Honkova+ (2015OEJV..168....1H 2015OEJV..168....1H)
44 = Variable Star Observers League in Japan (VSOLJ);
http://vsolj.cetus-net.org/
45 = Yang+ (2023MNRAS.522.3076Y 2023MNRAS.522.3076Y)
46 = Blattler & Diethelm (2003IBVS.5403....1B 2003IBVS.5403....1B)
47 = Diethelm (2005IBVS.5653....1D 2005IBVS.5653....1D)
48 = Diethelm (2006IBVS.5713....1D 2006IBVS.5713....1D)
49 = Diethelm (2007IBVS.5781....1D 2007IBVS.5781....1D)
50 = Yang 2011 (J/other/RAA/11.181)
51 = Hubscher+2011 (J/other/IBVS/5959)
52 = Demircan+ (2011IBVS.5965....1D 2011IBVS.5965....1D)
53 = Pagel (2018IBVS.6244....1P 2018IBVS.6244....1P)
54 = Lehky+ (2021OEJV..211....1L 2021OEJV..211....1L)
55 = Bundesdeutsche Arbeitsgemeinschaft fur Veranderliche Sterne (BAV);
http://www.bav-astro.eu/index.php
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History:
From electronic version of the journal
References:
Lin et al., Paper I 2022MNRAS.509.2362L 2022MNRAS.509.2362L
Lin et al., Paper II 2023MNRAS.523.2172L 2023MNRAS.523.2172L, Cat. J/MNRAS/523/2172
Liu et al., Paper III 2023MNRAS.523.2193L 2023MNRAS.523.2193L, Cat. J/MNRAS/523/2193
Guo et al., Paper V 2024MNRAS.528.6997G 2024MNRAS.528.6997G, Cat. J/MNRAS/528/6997
Xia et al., Paper VI 2025AJ....169..139X 2025AJ....169..139X, This catalog
(End) Prepared by [AAS], Robin Leichtnam [CDS] 11-Dec-2025