J/MNRAS/528/6997 Minute-cadence Observations of the TMTS. V. (Guo+, 2024)
Minute-cadence observations of the LAMOST fields with the TMTS- V.
Machine learning classification of TMTS catalogues of periodic variable stars.
Guo F., Lin J., Wang X., Chen X., Li T., Chen L., Xia Q., Mo J., Xi G.,
Zhang J., Liu Q., Jiang X., Yan S., Peng H., Liu J., Li W., Lin W.,
Xiang D., Ma X., Cai Y.
<Mon. Not. R. Astron. Soc. 528, 6997-7015 (2024)>
=2024MNRAS.528.6997G 2024MNRAS.528.6997G (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, variable ; Optical
Keywords: surveys - binaries: eclipsing -
stars: oscillations (including pulsations) -
stars: variables: delta Scuti
Abstract:
Periodic variables are always of great scientific interest in
astrophysics. Thanks to the rapid advancement of modern large-scale
time-domain surveys, the number of reported variable stars has
experienced substantial growth for several decades, which
significantly deepened our comprehension of stellar structure and
binary evolution. The Tsinghua University-Ma Huateng Telescopes for
Survey (TMTS) has started to monitor the LAMOST sky areas since 2020,
with a cadence of 1 minute. During the period from 2020 to 2022, this
survey has resulted in densely sampled light curves for ∼30000
variables of the maximum powers in the Lomb-Scargle periodogram above
the 5σ threshold. In this paper, we classified 11,638 variable
stars into 6 main types using XGBoost and Random Forest classifiers
with accuracies of 98.83% and 98.73%, respectively. Among them, 5301
(45.55%) variables are newly discovered, primarily consisting of delta
Scuti stars, demonstrating the capability of TMTS in searching for
short-period variables. We cross-matched the catalogue with Gaia's
second Data Release (DR2) and LAMOST's seventh Data Release (DR7) to
obtain important physical parameters of the variables. We identified
5504 delta Scuti stars (including 4876 typical delta Scuti stars and
628 high-amplitude delta Scuti stars), 5899 eclipsing binaries
(including EA-, EB- and EW-type) and 226 candidates of RS Canum
Venaticorum. Leveraging the metal abundance data provided by LAMOST
and the Galactic latitude, we discovered 8 candidates of SX Phe stars
within the class of "delta Scuti stars". Moreover, with the help of
Gaia color-magnitude diagram, we identified 9 ZZ ceti stars.
Description:
TMTS is a multi-tube telescope system with a field of view up to
18deg2, which started to monitor the LAMOST sky areas with a cadence
of 1 minute since 2020. Here is the catalog of delta scuti stars,
eclipsing binaries, candidates of RS CVn stars and ZZ Cetis discovered
by TMTS during the period from 2020 to 2022.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
dscthads.dat 177 5504 Catalogue for typical delta Scuti stars (DSCT)
and high-amplitude delta Scuti stars (HADS)
identified from TMTS observations (table 5)
ea-eb-ew.dat 177 5899 Catalogue for EA-, EB- and EW-type eclipsing
binaries identified from TMTS observations
(table 6)
rs.dat 177 226 Catalogue for RS CVn candidates identified from
TMTS observations (table 7)
zz.dat 177 9 Catalogue for ZZ Cetis identified from
TMTS observations (table 8)
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/156 : LAMOST DR7(Luo+, 2019)
J/MNRAS/523/2172 : TMTS delta Scuti stars (Lin+, 2023)
J/MNRAS/523/2193 : TMTS flare study from the first two years (Liu+, 2023)
Byte-by-byte Description of file: dscthads.dat ea-eb-ew.dat rs.dat zz.dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- Name TMTS identifier (TMTS JHHMMSSss+DDMMSSs)
24- 36 F13.9 deg RAdeg Right Ascension (J2000)
38- 49 F12.9 deg DEdeg Declination (J2000)
51- 61 F11.9 h Period Dominant period corresponding to maximum
power in Lomb-Scargle periodogram
63- 73 F11.9 mag Amp Peak-to-peak amplitude
75- 85 F11.9 --- R21 Amplitude ratio of a2/a1
87- 98 E12.2 --- Phi21 Phase difference of phi2-2*phi1
100-111 F12.9 mag GMAG ? Absolute magnitude derived from
Gaia DR2 database
113-124 F12.9 mag (Bp-Rp)0 ? Dereddening color derived from
Gaia DR2 database
126-135 A10 --- SpType Spectral class provided by LAMOST DR7
137-148 A12 --- VSXtype VSX variability type
150-160 F11.6 K Teff ? Mean effective temperature provided
by LAMOST DR7
162-172 F11.9 [cm/s2] logg ? Mean surface gravity provided by LAMOST DR7
174-177 A4 --- Type Type of the variable
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Acknowledgements:
Fangzhou Guo, gfz20(at)mails.tsinghua.edu.cn
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
(End) Patricia Vannier [CDS] 07-Feb-2024