J/ApJS/272/6 CaII triplet stellar-activity indices from LAMOST (Huang+, 2024)
The near-infrared CaII triplet as a stellar activity indicator: a library and
comparative study.
Huang X., He Y., Bai Z., Yuan H., Yang M., Zhou M., Dong Y., Wang M.,
He H., Zhang J., Chu Y., Zhao Y., Zhang Y., Zhang H.
<Astrophys. J. Suppl. Ser., 272, 6 (2024)>
=2024ApJS..272....6H 2024ApJS..272....6H
ADC_Keywords: Spectra, infrared; Abundances, [Fe/H]; Radial velocities;
Stars, G-type; Magnitudes; Optical
Keywords: Stellar activity ; Stellar chromospheres ; Astronomy databases
Abstract:
We have established and released a new stellar index library of the
CaII triplet, which serves as an indicator for characterizing the
chromospheric activity of stars. The library is based on data from the
Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)
Low-Resolution Spectroscopic Survey (LRS) Data Release 9. To better
reflect the chromospheric activity of stars, we have defined new
indices R and R+. The library includes measurements of R and R+ for
each CaII infrared triplet (IRT) from 699348 spectra of 562863 F, G,
and K-type solar-like stars with a signal-to-noise ratio higher than
100, as well as the stellar atmospheric parameters and basic
information inherited from the LAMOST LRS catalog. We compared the
differences between the three individual indices of the CaII triplet
and also conducted a comparative analysis of Rλ8542+ to the
CaII H and K S and RHK+ index databases. We observe the fraction
of less active stars decreases with Teff and the fraction of more
active stars first decreases with decreasing temperature and turns to
increase with decreasing temperature at 5800K. We also find that a
significant fraction of stars that show a high activity index in both
CaII H and K and IRT are binaries with low activity; some of them
could be discriminated in the CaII H and K S index and
Rλ8542+ space. This new stellar library serves as a
valuable resource for studying chromospheric activity in stars and can
be used to improve our comprehension of stellar magnetic activity and
other astrophysical phenomena.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 251 699348 Stellar activity database
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See also:
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/A+A/469/309 : Chromospheric activity in late-type stars (Cincunegui+, 2007)
J/AJ/138/312 : Activity of bright solar analogs (Hall+, 2009)
J/other/RAA/11.924 : Atmospheric parameters for 771 stars (Wu+, 2011)
J/MNRAS/452/765 : WD candidates using LAMOST DR3 (Gentile Fusillo+, 2015)
J/ApJ/809/77 : Transiting Exoplanet Survey Satellite (Sullivan+, 2015)
J/A+A/639/A35 : RV jitter and phot. var. correlation (Hojjatpanah+, 2020)
J/ApJ/905/38 : WD binary pathways survey. V. Gaia (Ren+, 2020)
J/ApJS/247/9 : FGK stars magnetic activity in LAMOST-Kepler (Zhang+, 2020)
J/A+A/674/A10 : Gaia DR3 systems with companions (Holl+, 2023)
http://www.lamost.org/ : LAMOST home page
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- obsid [31703101/914316197] LAMOST DR9 observation
identifier
11- 29 I19 --- GaiaDR3 Source identifier in Gaia DR3
31- 48 F18.15 mag Gmag [5.6/21.8]? Mean G mag provided by Gaia DR3
50- 55 F6.2 --- SNRi [100/999] SNR of LAMOST spectrum at i band
57- 62 F6.2 --- SNRz [100/999] SNR of LAMOST spectrum at z band
64- 74 F11.7 deg RAdeg RA of fiber point (J2000)
76- 85 E10.7 deg DEdeg [-9.7/88] Declination of fiber point (J2000)
87- 90 I4 K Teff [4800/6800] Effective temperature, LAMOST
AFGK Catalog
92- 96 I5 K e_Teff [0/913]?=-9999 Uncertainty of Teff
98- 102 F5.3 [cm/s2] logg [3.6/4.9] Surface gravity, LAMOST AFGK
Catalog
104- 112 F9.3 [cm/s2] e_logg [0/0.9]?=-9999 Uncertainty of logg
114- 119 F6.3 [-] FeH [-1.01/0.51] Metallicity, LAMOST AFGK Catalog
121- 129 F9.3 [-] e_FeH [0/0.8]?=-9999 Uncertainty of FeH
131- 137 F7.2 km.s-1 RVel [-453/432] Radial velocity, LAMOST AFGK
Catalog
139- 146 F8.2 km.s-1 e_RVel [0/84]?=-9999 Uncertainty of RVel
148- 152 F5.3 --- R8498 [0.63/1.6] R index (Equation 1; Section 3.1)
for CaII IRT 8498Å
154- 162 F9.3 --- e_R8498 [0.001/0.31]?=-9999 Uncertainty of R8498
164- 168 F5.3 --- R8542 [0.43/1.8] R index (Equation 1; Section 3.1)
for CaII IRT 8542Å
170- 178 F9.3 --- e_R8542 [0.001/0.2]?=-9999 Uncertainty of R8542
180- 184 F5.3 --- R8662 [0.46/1.6] R index (Equation 1; Section 3.1)
for CaII IRT 8662Å
186- 194 F9.3 --- e_R8662 [0.001/0.1]?=-9999 Uncertainty of R8662
196- 202 F7.4 --- R+8498 [-0.2/0.8] R+ index (Equation 2; Section 3.1)
for CaII IRT 8498Å
204- 213 F10.4 --- e_R+8498 [0.001/0.31]?=-9999 Uncertainty of R+8498
215- 221 F7.4 --- R+8542 [-0.23/1.1] R+ index (Equation 2;
Section 3.1) for CaII IRT 8542Å
223- 232 F10.4 --- e_R+8542 [0.001/0.2]?=-9999 Uncertainty of R+8542
234- 240 F7.4 --- R+8662 [-0.26/0.9] R+ index (Equation 2;
Section 3.1) for CaII IRT 8662Å
242- 251 F10.4 --- e_R+8662 [0.001/0.11]?=-9999 Uncertainty of R+8662
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History:
Downloaded from China-VO repository at doi:10.12149/101245
-- http://nadc.china-vo.org/res/r101395/
(End) Emmanuelle Perret [CDS] 07-Aug-2024