2007A&A...466.1089B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST10:46:53

2007A&A...466.1089B - Astronomy and Astrophysics, volume 466, 1089-1098 (2007/5-2)

The Ca II infrared triplet as a stellar activity diagnostic. II. Test and calibration with high resolution observations.

BUSA I., AZNAR CUADRADO R., TERRANEGRA L., ANDRETTA V. and GOMEZ M.T.

Abstract (from CDS):

We report on our analysis of the high resolution spectra (R≃86000) of a sample of 42 late-type active stars (with measured logR'HK spanning from ≃-3 to ≃-5) acquired with the Italian 3.6m Telescopio Nazionale Galileo (TNG) using the SARG spectrometer in the 4960-10110Å range. The high quality of the spectra and the good activity-level coverage allow us to measure two different chromospheric indicators that can be derived from the CaII infrared triplet (CaIIIRT) lines: the residual equivalent width (EQW) and the chromospheric indicator RIRT. The aim of this work is determine and test the best way of deriving activity-level information and errors from the CaIIIRT lines, in preparation of the GAIA Cornerstone mission by ESA, by which the CaIIIRT spectral range will be spectroscopically observed for millions of stars. The RIRT index is calculated for each observed star as the difference between the calculated NLTE photospheric central intensity and the observed one. The residual EQW, ΔWIRT, is calculated as the area of the positive profile obtained as the difference between the calculated NLTE photospheric and the observed profiles. We correlate logR'HK with RIRT and the ΔWIRT. This analysis indicates that CaIIIRT lines are good chromospheric diagnostics. We find that both ΔWIRT and the RIRT quantities can be used as chromospheric indicators, although the former exhibits a tighter correlation with the logR'HK index. Furthermore, we find that the total chromospheric excess EQW in the CaIIIRT is almost linearly correlated with the excess in the CaIIH&K doublet, as estimated through the logR'HK index.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - radiative transfer - line: formation - stars: chromospheres - stars: activity

Simbad objects: 42

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Number of rows : 42

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 14798 PM* 02 24 10.1868517374 +40 05 40.544307991       7.1   K0 15 0
2 * 50 Per RS* 04 08 36.6168168411 +38 02 23.055834828 7.78 5.97   5.2   F8V 204 0
3 HD 26736 BY* 04 14 32.3143718674 +23 34 29.798017740   8.711 8.047 7.691 7.356 G5V 190 0
4 V* V997 Tau BY* 04 32 59.4512598102 +15 49 08.285618403   9.396 8.641 8.235 7.867 ~ 150 0
5 V* MS Cam BY* 04 33 54.2421848388 +64 38 00.290832693   8.533 7.755     ~ 58 0
6 HD 29461 PM* 04 38 57.3279273979 +14 06 20.016018199   8.593 7.945 7.585 7.253 G5 108 0
7 HD 31000 BY* 04 53 56.2110534918 +36 45 26.760137119   8.51 7.74     G5V 33 0
8 V* V1358 Ori BY* 06 19 08.0574744469 -03 26 20.358775839   8.52 7.95     G0V 89 1
9 HD 47157 PM* 06 37 31.7959630390 +09 08 39.410244305   8.34 7.62     G5IV-V 44 0
10 HD 58781 PM* 07 27 50.7813895632 +19 02 41.256466684   7.96 7.24     G5 47 0
11 HD 59747 BY* 07 33 00.5803322465 +37 01 47.450630754   8.58 7.70     G5V 82 0
12 HD 64468 SB* 07 54 54.0634088964 +19 14 10.826042815 9.548 8.715 7.726 7.182 6.723 K2.5V 67 0
13 HD 65430 SB* 07 59 33.9366319995 +20 50 38.194256358 9.004 8.494 7.649 7.195 6.776 K0V 95 1
14 HD 68638 PM* 08 16 06.3192504522 +57 05 38.911558507   8.25   7.0   G8V 64 1
15 HD 72760 PM* 08 34 31.6518115846 -00 43 33.828433319 8.613 8.159 7.334 6.891 6.492 K0V 103 0
16 HD 72946 PM* 08 35 51.2665915520 +06 37 21.970611710 8.23     6.7   G8-V 102 0
17 HD 76752 PM* 08 58 49.8691384673 +25 24 17.874274329   8.10 7.45     G2V 50 0
18 HD 76780 PM* 08 58 55.7308058943 +21 09 58.640767144   8.32 7.63     G5 48 0
19 HD 79969 BY* 09 17 53.45577 +28 33 37.8633   8.19   6.6   K3V 182 1
20 HD 81040 PM* 09 23 47.0873633956 +20 21 52.028150111 8.510 8.370   7.3   G0V 70 1
21 HD 82443 BY* 09 32 43.7594363452 +26 59 18.708212270   7.78   6.6   G9V(k) 220 1
22 BD+10 2016 * 09 32 52.6421270179 +09 53 14.911546625   10.63 9.41     K0 8 0
23 HD 91148 PM* 10 31 45.6037992423 +24 04 55.940851741   8.61 7.94     G8V 29 0
24 HD 94765 BY* 10 56 30.7993244117 +07 23 18.508791002 8.944 8.252 7.379 6.815 6.442 K0V 86 0
25 HD 96937 PM* 11 09 40.2205124938 +02 27 22.488764125   9.30 9.11 7.2   G8V 51 0
26 HD 98736 PM* 11 21 49.3424085548 +18 11 24.023006199       8.69   K0 57 0
27 HD 105631 PM* 12 09 37.2563471150 +40 15 07.404577561   8.26   7.0   G7V 110 0
28 HD 108574 PM* 12 28 04.4451301253 +44 47 39.518245075   7.92   7.1   F9V 52 0
29 HD 110833 SB* 12 44 14.5447567445 +51 45 33.372388151   7.98   6.4   K3 144 0
30 HD 112742 PM* 12 58 59.5244758536 -08 44 20.222566758   8.59 7.57     G8IV 12 0
31 HD 116442 PM* 13 23 39.1537725393 +02 43 23.978332588   7.83   6.5   G9V 91 0
32 HD 119332 PM* 13 41 13.4050091531 +56 43 37.822167538   8.62 7.78     K0V 42 0
33 HD 122676 PM* 14 02 56.8650168270 +14 58 31.255330975 8.150 7.860 7.140     G7V 46 0
34 HD 128311 BY* 14 36 00.5607343227 +09 44 47.453643485 9.232 8.441 7.446 6.895 6.425 K3V 268 1
35 HD 129674 * 14 42 00.7072888227 +52 00 19.145960614   7.93 7.54     F0 33 0
36 HD 131023 PM* 14 51 02.3145209634 +09 43 25.208360422       7.1   K0V 33 0
37 HD 132756 SB* 15 00 34.9952265484 +08 36 00.630769172   8.01   6.8   G0 46 0
38 HD 149806 PM* 16 37 08.4281315414 +00 15 15.626275854 8.451 7.916 7.065 6.604 8.71 K0V 60 0
39 HD 164922 PM* 18 02 30.8624729311 +26 18 46.803383047   7.79   6.5   G9V 179 1
40 HD 165807 ** 18 08 08.6438795879 -07 07 11.654091729   8.73 7.52     K1III 8 1
41 V* V889 Her BY* 18 34 20.1030244573 +18 41 24.234582456   8.00 7.449   6.720 G2V 118 0
42 HD 175742 RS* 18 55 53.2251373830 +23 33 23.929225997 9.524 8.941 8.019 7.483 6.958 K0V 173 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-10:46:53

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