J/ApJS/264/17 Spectroscopic data of TESS objects with LAMOST (Zhang+, 2023)
Stellar parameters and spectroscopic properties of TESS objects observed in the
LAMOST low- and medium-resolution spectral survey.
Zhang L.-Y., Su T., Misra P., Han X.L., Meng G., Pi Q., Yang J.
<Astrophys. J. Suppl. Ser., 264, 17 (2023)>
=2023ApJS..264...17Z 2023ApJS..264...17Z
ADC_Keywords: Abundances, [Fe/H]; Spectral types; Radial velocities;
Equivalent widths; Photometry, SDSS; Stars, flare;
Stars, diameters; Spectra, optical
Keywords: Stellar activity ; Stellar chromospheres ; Stellar flares
Abstract:
Stellar parameters and magnetic activity are important for the
understanding of stellar physics and dynamo theory. We have used
LAMOST spectroscopic surveys to study stellar parameters and magnetic
activity properties of TESS objects. There are 46684 spectra of
31385 TESS objects in the LAMOST low-resolution spectral survey. We
have calculated equivalent widths of CaII H and K, and Hα lines,
and discussed the relationship of chromospheric activity with stellar
temperature. There are 25710 spectra of 10404 stars with repeated
low-resolution observations. We found that there are 694 objects with
variations of the Hα line and 1406 objects with varying radial
velocities. Moreover, there are 14099 spectra of 5834 TESS objects in
the LAMOST medium-resolution survey, of which there are 2666 objects
with Hα variations and 1480 objects with variation in radial
velocities. By using the light curves of the TESS objects in the
LAMOST field, we detected 4269 flare events and determined their flare
parameters. We have confirmed that the fraction of the flare stars
increases as stellar temperature decreases. There is also an observed
relationship between the flare energy and chromospheric activity. We
have calculated the power-law index between the flare energy and decay
time using TESS data to be 0.27(0.01), which can be explained by the
magnetic reconnection theory. We confirmed that R_Hα' is
stable for Rossby number R<0.1 and decreases with the increase of
Rossby number R>0.1. There is a positive correlation between the
brightness variation amplitude due to star spots from TESS and the
Hα intensity from LAMOST.
Description:
We downloaded the TESS data on the STScI Mikulski Archive for Space
Telescopes (MAST) server. It contained 14,770,000 and 9,600,000 light
curves in the southern and northern hemispheres.
The LAMOST telescope has two observational modes: the low-resolution
spectrometer with a resolution of about 1800 and wavelength coverage
of 3000-9000Å, and the medium-resolution spectroscopic spectrometer
with a resolution of about 7500 and two channels of 4900-5400Å and
6300-6800Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 221 31378 Stellar parameters and Hα information of
TESS objects in the field of LAMOST low-resolution
spectral survey
table2.dat 131 42676 Stellar parameters and Hα information of
TESS objects in the field of LAMOST
medium-resolution spectral survey
table3.dat 121 25697 Stellar parameters and Hα information of
TESS objects in the field of LAMOST low-resolution
spectral for multiple survey
table4.dat 104 4269 Flare parameters based on TESS data
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See also:
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002)
J/AJ/126/2048 : NStars project: the Northern Sample. I. (Gray+, 2003)
J/AJ/128/426 : Subdwarfs in the SDSS (West+, 2004)
J/AJ/140/1402 : M dwarf flares from SDSS spectra (Hilton+, 2010)
J/AJ/141/97 : SDSS DR7 M dwarfs (West+, 2011)
J/ApJ/743/48 : Stars with rot. periods & X-ray lum. (Wright+, 2011)
J/other/RAA/11.924 : Atmospheric parameters for 771 stars (Wu+, 2011)
J/other/Nat/485.478 : Superflares on solar-type stars (Maehara+, 2012)
J/ApJS/209/5 : Superflares of Kepler stars. I. (Shibayama+, 2013)
J/ApJ/795/161 : Activity & rot. in Praesepe & Hyades (Douglas+, 2014)
J/MNRAS/447/2714 : Flare stars across the H-R diagram (Balona+, 2015)
J/ApJS/224/37 : White-light flares on close bin. from Kepler (Gao+, 2016)
J/ApJ/829/34 : Kepler heartbeat star radial velocities (Shporer+, 2016)
J/ApJ/834/207 : Periodicity & mag. of Kepler LCs var. (Mehrabi+, 2017)
J/ApJ/851/91 : Studies of solar white-light flares (Namekata+, 2017)
J/ApJS/232/26 : Catalog of Kepler flare stars (Van Doorsselaere+, 2017)
J/ApJ/849/36 : Flaring activity of M dwarfs in Kepler (Yang+, 2017)
J/MNRAS/476/908 : Chromospheric activity in 4 open clusters (Fang+, 2018)
J/AJ/156/102 : TESS Input Catalog & Cand. Target List (Stassun+, 2018)
J/ApJS/243/28 : M-type star activities from LAMOST & Kepler (Lu+, 2019)
J/ApJS/241/29 : Flare cat. through LC data of Kepler DR25 (Yang+, 2019)
J/AJ/159/60 : Flares from 1228 stars in TESS (Gunther+, 2020)
J/other/NatAs/4.03 : Rotation and activity across HR diagram (Lehtinen+, 2020)
J/other/NatAs/4.658 : Rotation and activity across HR diagram (Lehtinen+, 2020)
J/ApJ/890/46 : Superflares on solar-type stars from TESS (Tu+, 2020)
J/ApJ/891/23 : Stellar abund. from LAMOST MRS (SPCAnet) (Wang+, 2020)
J/ApJS/247/9 : FGK stars activity in LAMOST-Kepler field (Zhang+, 2020)
J/A+A/646/A34 : Search for flares and CMEs in SDSS data (Koller+, 2021)
J/ApJS/253/11 : TESS observations of Cepheid stars (Plachy+, 2021)
J/ApJS/253/19 : Halpha & other EWs of LAMOST M-type stars (Zhang+, 2021)
J/ApJS/264/12 : Chromospheric activities from LAMOST and K2 (Han+, 2023)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [LAMOST]
8- 26 A19 --- LAMOST LAMOST identifier (JHHMMSS.ss+DDMMSS.s)
28- 38 F11.5 d HJD [55858.9/58643.2] Heliocentric Julian Date;
HJD-2400000
40- 47 F8.2 s Exp [500/9000]?=-9999 Exposure time
49- 58 A10 --- SpT Spectral type
60- 67 F8.2 --- S/Nu [0/525]?=-9999 Signal-to-noise ratio in
the u band
69- 76 F8.2 --- S/Nr [0/999]?=-9999 Signal-to-noise ratio in
the R band
78- 85 F8.2 km/s RV [-1191/29742]? Radial velocity
87- 94 F8.2 km/s e_RV [0.04/316]? Uncertainty in RV
96-114 A19 --- SDSS SDSS identifier (JHHMMSS.ss+DDMMSS.s) if any
116-121 F6.3 mag umag [6.79/33.41]? Apparent u-band AB magnitude
123-128 F6.3 mag gmag [6.53/36.35]? Apparent g-band AB magnitude
130-135 F6.3 mag rmag [6.77/28.24]? Apparent r-band AB magnitude
137-143 F7.3 mag g-r [-14.52/28.73]? The (g-r) color index
145-150 F6.3 mag imag [5.95/27.73]? Apparent i-band magnitude
152-157 F6.3 mag zmag [5/31.71]? Apparent z-band magnitude
159-168 F10.6 0.1nm EWHa [-13.63/96.71] Hα equivalent width
170-178 F9.6 0.1nm e_EWHa [0.01/10.3] Uncertainty in EWHa
180 A1 --- E [NY-] Stellar activity code
(Y=active; N=inactive)
182-188 F7.1 K Teff [2824/62000]? Effective temperature
190-196 F7.1 K e_Teff [3/15000]? Uncertainty in Teff
198-202 F5.3 [cm/s2] log(g) [3.17/6.4]? log surfact gravity
204-208 F5.3 [cm/s2] e_log(g) [0/0.7]? Uncertainty in log(g)
210-215 F6.3 [Sun] [Fe/H] [-2.3/0.75]? Metallicity
217-221 F5.3 [Sun] e_[Fe/H] [0.003/0.31]? Uncertainty in [Fe/H]
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- LAMOST LAMOST identifier (JHHMMSS.ss+DDMMSS.s)
21- 31 F11.5 d HJD [58024.8/58649.2]? Heliocentric Julian Date;
HJD-2400000 (1)
33- 37 F5.1 --- SNR [0/999] Spectrum signal-to-noise ratio
39- 47 F9.3 0.1nm EWHa [-2995/7401] Hα equivalent width;
Angstroms
49- 53 F5.3 0.1nm e_EWHa [0/2] Uncertainty in EWHa
55- 62 F8.3 --- RatioHa [-131.1/238.5] Maximum to minimum Hα
equivalent width ratio
64- 72 F9.3 0.1nm DiffHa [0/10395] Difference between maximum and
minimum Hα equivalent width; Angstroms
74 A1 --- VarHa Does Hα change; Y(es) or N(o)
78- 84 F7.2 km/s RV [-599/600]? Radial velocity
86- 89 F4.2 km/s e_RV [0.1/9]? Uncertainty in RV
91- 97 F7.2 --- RatioRV [-435/309]? Maximum to minimum radial
velocity ratio
99- 105 F7.2 km/s DiffRV [0.04/1158]? Difference between maximum and
minimum radial velocity
107 A1 --- VarRV Does RVel change; Y(es) or N(o)
109- 115 F7.1 K Teff [3011/50000]? Effective temperature
117- 122 F6.4 [cm/s2] logg [3.2/6]? Log surface gravity
124- 129 F6.3 [Sun] [Fe/H] [-2.2/0.4]? Log Fe/H number abundance
131- 131 A1 --- E Stellar activity flag (Y=active or
N=inactive)
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Note (1): The data of LAMOST observation. Some of the medium-resolution LAMOST
spectra are merged from several spectra observed at different times
and thus do not have an observation time.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- --- [LAMOST]
8- 26 A19 --- LAMOST LAMOST identifier (JHHMMSS.ss+DDMMSS.s)
28- 38 F11.5 d HJD [55859/58634] Heliocentric Julian Date;
HJD-2400000
40- 47 A8 --- SpT Spectral type
49- 58 F10.6 0.1nm EWHa [-8.5/106] Hα equivalent width;
Angstroms
60- 67 F8.6 0.1nm e_EWHa [0.01/8] Uncertainty in EWHa
69- 76 F8.3 --- RatioHa [-87/2386] Maxmimum to minimum Hα
equivalent width ratio
78- 83 F6.3 0.1nm DiffHa [0/41] Difference between maximum and minimum
Hα equivalent width; Angstroms
85 A1 --- VarHa Does Hα change; Y(es) or N(o)
87- 94 F8.2 km/s RV [-1240/29950]? Radial velocity
96- 101 F6.2 km/s e_RV [0/151]? Uncertainty in RV
103- 110 F8.3 --- RatioRV [-2.1/1249]? Maxmimum to minimum radial
velocity ratio
112- 119 F8.3 km/s DiffRV [0.1/10000]? Difference between maximum and
minimum radial velocity
121- 121 A1 --- VarRV Does RVel change; Y(es) or N(o)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 I10 --- TIC [1006569/1400714115] TESS identifier
12- 21 F10.5 d Peak [1387.6/2169.5] Peak time, HJD-2457000
23- 32 F10.5 d Start [1387.6/2169.5] Start time, HJD-2457000
34- 43 F10.5 d End [1387.6/2169.6] End time, HJD-2457000
45- 51 F7.5 d Dur [0.0097/1.03] Duration
53- 59 F7.5 d Decay [0.0027/0.27] Decay time
61- 69 F9.6 --- Amp [0.0015/12.2] Amplitude
71- 75 I5 K Teff [2554/44000]? Stellar effective temperature
77- 82 F6.3 Rsun Rad [0.12/95.7]? Stellar radius
84- 91 E8.2 10-7J Eng [5.6e+31/2.3e+38]? Energy; erg
93-104 A12 --- Type Reason for flare ("flare star" or "microlensing")
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 07-Mar-2023