J/MNRAS/523/2172 TMTS delta Scuti stars (Lin+, 2023)
Minute-cadence observations of the LAMOST fields with the TMTS:
II. Catalogues of short-period variable stars from the first 2-year surveys.
Lin J., Wang X., Mo J., Xi G., Filippenko A.V., Yan S., Brink T.G., Yang Y.,
Wu C., Nemeth P., Li G., Guo F., Guo J., Cai Y., Xiong H., Zheng W.,
Liu Q., Zhang J., Jiang X., Chen L., Xia Q., Peng H., Chen Z., Li W.,
Lin W., Xiang D., Ma X., Liu J.
<Mon. Not. R. Astron. Soc. 523, 2172 (2023)>
=2023MNRAS.523.2172L 2023MNRAS.523.2172L (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, variable ; Photometry ; Optical ;
Effective temperatures
Keywords: surveys - stars: oscillations (including pulsations) -
binaries (including multiple): close, novae, cataclysmic variables
Abstract:
Over the past few years, wide-field time-domain surveys like ZTF and
OGLE have led to discoveries of various types of interesting
short-period stellar variables, such as ultracompact eclipsing binary
white dwarfs, rapidly rotating magnetised white dwarfs (WDs),
transitional cataclysmic variables between hydrogen-rich and helium
accretion, and blue large-amplitude pulsators (BLAPs), which greatly
enrich our understandings of stellar physics under some extreme
conditions. In this paper, we report the first-two-year discoveries of
short-period variables (i.e., P<2hr) by the Tsinghua University-Ma
Huateng Telescopes for Survey (TMTS). TMTS is a multi-tube telescope
system with a field of view up to 18deg2, which started to monitor
the LAMOST sky areas since 2020 and generated uninterrupted
minute-cadence light curves for about ten million sources within 2
years. Adopting the Lomb-Scargle periodogram with period-dependent
thresholds for the maximum powers, we identify over 1,100 sources that
exhibit a variation period shorter than 2hr. Compiling the light
curves with the Gaia magnitudes and colours, LAMOST spectral
parameters, VSX classifications, and archived observations from other
prevailing time-domain survey missions, we identified 1,076 as delta
Scuti stars, which allows us study their populations and physical
properties in the short-period regime. The other 31 sources include
BLAPs, subdwarf B variables (sdBVs), pulsating WDs,
ultracompact/short-period eclipsing/ellipsoidal binaries, cataclysmic
variables below the period gap, etc., which are highly interesting and
worthy of follow-up investigations.
Description:
TMTS is a multi-tube telescope system with a field of view up to 18
deg2, which started to monitor the LAMOST sky areas since 2020 and
generated uninterrupted minute-cadence light curves for about ten
million sources within 2 years. Here is the catalog of short-period
Delta Scuti stars discovered by TMTS.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
dsct.dat 154 1076 Catalogue for delta Scuti stars identified
from TMTS observations
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/164 : LAMOST DR5 catalogs (Luo+, 2019)
J/MNRAS/523/2193 : TMTS flare study from the first two years (Liu+, 2023)
Byte-by-byte Description of file: dsct.dat
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Bytes Format Units Label Explanations
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1- 21 A21 --- ID TMTS identifier (TMTSJHHMMSSss+DDMMSSs)
23- 31 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
34- 41 F8.5 deg DEdeg Declination in decimal degrees (J2000)
43- 48 F6.2 min Per Dominant period corresponding to maximum
power in Lomb-Scargle periodogram
51- 54 F4.2 min e_Per Error of dominant period
56- 61 F6.2 --- PwrMax Maximum power in Lomb-Scargle periodogram
63- 67 F5.2 --- SNR Signal-to-noise ratio of variability
69- 73 F5.3 mag Amp Peak-to-peak amplitude obtained from
best-fitting model
75- 80 F6.3 mag L0 Median magnitude obtained from the
best-fitting model
82- 86 F5.3 --- R21 Amplitude ratio of a2/a1
88- 92 F5.3 --- phi21 Phase difference of phi2-2*phi1
94-104 F11.5 d Tmax MJD of maximum light
106-111 F6.3 mag GMAG ? Absolute magnitude derived from
Gaia DR2 database
113-118 F6.3 mag (B-R)0 ? Dereddening color derived from
Gaia DR2 database
121-124 I4 K Teff ? Mean effective temperature provided
by LAMOST DR7
126-129 F4.2 [cm/s2] logg ? Mean surface gravity provided by LAMOST DR7
131-140 A10 --- LAMOSTType Spectral class provided by LAMOST DR7
142-149 A8 --- VSXType VSX variability type
154 A1 --- Notes [CM] Note (1)
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Note (1): Note as follows:
M = TMTS photometry of target might be polluted by adjacent star(s)
C = identification is absent of a reliable distance, LAMOST spectral
parameters, and VSX classifications
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Acknowledgements:
Jie Lin, linjie_astro(at)163.com
References:
Lin et al., Paper I 2022MNRAS.509.2362L 2022MNRAS.509.2362L
Liu et al., Paper III 2023MNRAS.523.2193L 2023MNRAS.523.2193L, Cat. J/MNRAS/523/2193
(End) Patricia Vannier [CDS] 13-Apr-2023