1997A&AS..124..359M


Query : 1997A&AS..124..359M

1997A&AS..124..359M - Astron. Astrophys., Suppl. Ser., 124, 359-384 (1997/August-0)

The Ca II triplet lines as diagnostics of luminosity, metallicity and chromospheric activity in cool stars.

MALLIK S.V.

Abstract (from CDS):

CCD spectra of the infrared triplet lines of ionized calcium at λλ8498, 8542, 8662 have been obtained at a spectral resolution of 0.4Å in 146 stars brighter than V=+7.0 spanning a range in spectral types from F7 to M4 of all luminosity classes and a range in metallicity [Fe/H] from -3.0 to +1.1. These have been analysed to investigate the dependence of the Ca II triplet strengths on stellar parameters like luminosity, temperature and metallicity. A detailed study reveals a strong dependence on luminosity, much stronger for metal rich stars than for the metal poor ones and a milder dependence on metallicity, although much more conspicuous in supergiants than in dwarfs. All these correlations are found to be non-linear over the parameter space covered. The present study also shows chromospheric activity to be an important phenomenon affecting the strength and the shape of the line profiles. Stars of similar luminosity and metallicity have varying Ca II line depths owing to varying chromospheric emission filling in their Ca II absorption. The Ca II triplet strength is thus observed to be a triparametric discriminant in cool stars.

Abstract Copyright:

Journal keyword(s): stars: late-type - stars: chromospheres - galaxies: stellar content

VizieR on-line data: <Available at CDS (J/A+AS/124/359): table1 table2 tables.tex>

Simbad objects: 41

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Number of rows : 41
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 * 3 Cet s*r 00 04 30.1187522978 -10 30 34.278904524   6.541 4.924     K3Ib 112 0
2 * bet Cet PM* 00 43 35.37090 -17 59 11.7827 3.90 3.02 2.01 1.29 0.78 G9.5IIICH-1 528 1
3 * tet Cet HB* 01 24 01.4032816333 -08 10 59.739230440 5.57 4.65 3.59 2.83 2.26 K0IIIb 198 0
4 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1261 1
5 * eta Per * 02 50 41.8099734665 +55 53 43.779721818 7.38 5.48 3.79 2.56 1.67 K3-Ib-IIa 217 0
6 * e Eri PM* 03 19 55.6509122226 -43 04 11.215188426 5.20 4.98 4.27 3.65 3.25 G6V 455 1
7 * eps Eri BY* 03 32 55.8444911587 -09 27 29.739493865 5.19 4.61 3.73 3.00 2.54 K2V 1947 1
8 * 11 Tau SB* 03 40 46.3097428032 +25 19 46.158526416   6.187 6.102     A2IV 56 0
9 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1258 2
10 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1181 0
11 * phi02 Ori PM* 05 36 54.3885728561 +09 17 26.416510827 5.70 5.04 4.09 3.33 2.78 G9.5IIIbFe-2.5 361 0
12 * bet Col PM* 05 50 57.5922846925 -35 46 05.914636356 5.49 4.28 3.12 2.27 1.69 K1III_CN+1 148 0
13 * chi01 Ori RS* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 856 0
14 * eta Gem RG* 06 14 52.6452865329 +22 30 24.434377815 6.55 4.89 3.28 1.79 0.48 M2IIIa 259 0
15 HD 44033 Pu* 06 20 04.2239782152 +14 39 04.066374096   7.224 5.658     K5III 75 0
16 * eps Gem V* 06 43 55.9271511904 +25 07 52.057892524 5.85 4.39 2.98 2.01 1.40 G8Ib 395 0
17 * tet CMa PM* 06 54 11.3988612864 -12 02 19.061163780 7.20 5.51 4.08 2.95 2.17 K3/4III 222 0
18 * zet Gem cC* 07 04 06.5312384690 +20 34 13.074474962 5.20 4.58 3.79   3.082 G1Ib 571 0
19 * sig Gem RS* 07 43 18.7276907303 +28 53 00.631838445 6.38 5.41 4.29 3.37 2.79 K1IIIe 482 0
20 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1105 2
21 * omi UMa PM* 08 30 15.8701566400 +60 43 05.405606188 4.79 4.27 3.42 2.76 2.31 G5III: 255 1
22 * eps Hya Ro* 08 46 46.51223 +06 25 07.6855 4.43 4.06 3.38 2.78 2.39 G1III+A8V 262 0
23 * eps Leo V* 09 45 51.0736168507 +23 46 27.313597604 4.23 3.79 2.98 2.36 1.93 G1IIIa 341 0
24 * nu. Hya PM* 10 49 37.4882533447 -16 11 37.129417316 5.62 4.35 3.11 2.17 1.53 K1.5IIIHdel-0.5 181 0
25 * del Crt PM* 11 19 20.4473515372 -14 46 42.743409457 5.66 4.67 3.56 2.73 2.13 G9IIICH0.5 170 0
26 * bet Vir PM* 11 50 41.7185158616 +01 45 53.001539131 4.26 4.15 3.60 3.13 2.85 F9V 934 0
27 * bet Crv PM* 12 34 23.2349224335 -23 23 48.336778328 4.17 3.52 2.64 2.03 1.59 G5IIBa0.3 259 0
28 * del Vir RG* 12 55 36.2086240844 +03 23 50.888053818 6.76 4.97 3.38 1.86 0.53 M3+III 273 0
29 * bet Com PM* 13 11 52.3938268062 +27 52 41.462309460 4.92 4.84 4.25 3.77 3.47 F9.5V 912 0
30 HD 124425 SB* 14 13 40.7900927904 -00 50 43.670606172   6.38 5.90     F6V 115 0
31 * phi Vir PM* 14 28 12.1389021744 -02 13 40.649015856   5.522 4.840     G2IV 194 0
32 * ksi Boo BY* 14 51 23.37993 +19 06 01.6994 5.618 5.370 4.593 3.91 3.48 G7Ve+K5Ve 478 0
33 * zet Her SB* 16 41 17.16104 +31 36 09.7873 3.640 3.430 2.800 2.31 1.99 G0IV 548 0
34 * bet Dra * 17 30 25.9616959 +52 18 04.999351 4.43 3.79 2.81 2.12 1.64 G2Ib-IIa 417 0
35 * mu.01 Her ** 17 46 27.5472960785 +27 43 14.560978925 4.56 4.17 3.42 2.89 2.51 G5IV 695 0
36 * bet01 Cap SB* 20 21 00.6665981712 -14 46 53.067367488 4.14 3.87 3.08 2.53 2.03 G9II:+B8p:Si: 182 0
37 * bet Cap ** 20 21 00.67 -14 46 53.0           ~ 166 0
38 * 9 Peg V* 21 44 30.6958020785 +17 21 00.062899998 6.48 5.52 4.35 3.53 2.98 G5Ib 269 0
39 * 56 Peg SB* 23 07 06.7418870416 +25 28 05.773861158 7.20 6.06 4.74 3.74 3.07 K0.5II:Ba1CN-2CH-0.5 263 0
40 * lam And RS* 23 37 33.8427800830 +46 27 29.344721109 5.54 4.84 3.82 3.04 2.47 G8IVk 672 0
41 * phi02 Eri * ~ ~           K1V 1 0

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