2025ApJ...984....2H

Query : 2025ApJ...984....2H

2025ApJ...984....2H - Astrophys. J., 984, 2 (2025/May-1)

Impact of Spectral Resolution on S-index and Its Application to Spectroscopic Surveys.

HAN H., WANG S., LI X., ZHENG C. and LIU J.

Abstract (from CDS):

Utilizing the PHOENIX synthetic spectra, we investigated the impact of spectral resolution on the calculation of S-indices. We found that for spectra with a resolution lower than ≈30,000, it is crucial to calibrate S-indices for accurate estimations. This is especially essential for low-resolution spectral observations. We provided calibrations for several ongoing or upcoming spectroscopic surveys such as the LAMOST low-resolution survey, the SEGUE survey, the Sloan Digital Sky Survey-V/BOSS survey, the DESI survey, the Maunakea Spectroscopic Explorer survey, and the MUST survey. Using common targets between the HARPS and Mount Wilson Observatory (MWO) observations, we established conversions from spectral S-indices to the well-known SMWO values, applicable to stars with [Fe/H] values greater than -1. These calibrations offer a reliable approach to converting S-indices obtained from various spectroscopic surveys into SMWO values and can be widely applied in studies on chromospheric activity.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Late-type stars - Stellar activity

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * 70 Oph A SB* 18 05 27.2484131991 +02 30 00.526614953       3.6   K0V 252 0

Query : 2025ApJ...984....2H

Basic data :
* 70 Oph A -- Spectroscopic Binary
Other object types: otypes_help 		* (BD,*,...), PM* (2000A&A,LFT,...), ** (**,ADS,...), SB* (2018A&A), Ro* (1996ApJ)
ICRS coord. (ep=J2000) : 		18 05 27.2484131991 +02 30 00.526614953 (Optical) [ 0.1420 0.1350 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		18 02 55.7099307096 +02 30 37.579928674 [ 0.1420 0.1350 90 ]
Gal coord. (ep=J2000) : 		029.8934138988001 +11.3671561937098 [ 0.1420 0.1350 90 ]
Proper motions mas/yr : 		206.525 -1107.492 [0.246 0.164 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -9.73 [0.52] / z(spectroscopic) -0.000032 [0.000002] / cz -9.73 [0.52]
   (Opt) A 2018A&A...619A..81H
Parallaxes (mas): 		195.5674 [0.1964] A 2020yCat.1350....0G
Spectral type: 		K0V C 1967AJ.....72.1334C
Fluxes (2) :
R 3.6 [~] E 2003AJ....125..984M
G 3.987364 [0.003003] C 2020yCat.1350....0G
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Hierarchy : number of linked objects
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Identifiers (29) :
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BD+02 3482A GCRV 10531 NLTT 45899 USNO 877
* 70 Oph A GJ 702 A 8pc 196.62A WDS J18055+0230A
** STF 2272A HD 165341A ROT 3523 Zkh 271
ADS 11046 A IDS 18004+0232 A SPOCS 2969 Gaia DR3 4468557611984384512
ASCC 1153899 LFT 1390 TIC 1674663309 Gaia DR2 4468557611977678336
CCDM J18055+0230A LHS 458 TYC 434-5213-1
CNS5 4473 LSPM J1805+0229A UBV 15377
CSI+02 3482 10 LTT 15337 USNO-B1.0 0924-00457807

References (252 between 1850 and 2026) (Total 252)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 21    Distance : 1    Var : 1    Rot : 3    Fe/H : 7    Plx : 1    PM : 4    SpT : 3   

   

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ISO : 2   

   

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CCDM J18055+0230A GJ 702 A HD 165341A LHS 458 LSPM J1805+0229A
NLTT 45899 TYC 434-5213-1 USNO-B1.0 0924-00457807 WDS J18055+0230A Gaia DR3 4468557611984384512
Gaia DR2 4468557611977678336

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