2007A&A...475..981B


Query : 2007A&A...475..981B

2007A&A...475..981B - Astronomy and Astrophysics, volume 475, 981-989 (2007/12-1)

Deriving temperature, mass, and age of evolved stars from high-resolution spectra. Application to field stars and the open cluster IC 4651.

BIAZZO K., PASQUINI L., GIRARDI L., FRASCA A., DA SILVA L., SETIAWAN J., MARILLI E., HATZES A.P. and CATALANO S.

Abstract (from CDS):

We test our capability of deriving stellar physical parameters of giant stars by analysing a sample of field stars and the well studied open cluster IC 4651 with different spectroscopic methods. The use of a technique based on line-depth ratios (LDRs) allows us to determine with high precision the effective temperature of the stars and to compare the results with those obtained with a classical LTE abundance analysis. (i) For the field stars we find that the temperatures derived by means of the LDR method are in excellent agreement with those found by the spectral synthesis. This result is extremely encouraging because it shows that spectra can be used to firmly derive population characteristics (e.g., mass and age) of the observed stars. (ii) For the IC 4651 stars we use the determined effective temperature to derive the following results. a) The reddening E(B-V) of the cluster is 0.12±0.02, largely independent of the color-temperature calibration used. b) The age of the cluster is 1.2±0.2Gyr. c) The typical mass of the analysed giant stars is 2.0±0.2M. Moreover, we find a systematic difference of about 0.2dex in logg between spectroscopic and evolutionary values. We conclude that, in spite of known limitations, a classical spectroscopic analysis of giant stars may indeed result in very reliable stellar parameters. We caution that the quality of the agreement, on the other hand, depends on the details of the adopted spectroscopic analysis.

Abstract Copyright:

Journal keyword(s): stars: late-type - Galaxy: open cluster and associations: individual: IC 4651 - techniques: spectroscopic

Simbad objects: 79

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Number of rows : 79
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * 44 Psc ** 00 25 24.2083431267 +01 56 22.892599678   6.616 5.770     G8III 63 0
2 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 562 0
3 * 39 Cet RS* 01 16 36.2882494986 -02 30 01.329588503   6.310 5.428     G6III:eFe-2 246 0
4 * eta02 Hyi PM* 01 54 56.1320498641 -67 38 50.294625663   5.623 4.685     G8IIIb 95 1
5 * pi. For PM* 02 01 14.7226685359 -30 00 06.585108110   6.23 5.35     G8III 61 0
6 * lam02 For PM* 02 36 58.6079324808 -34 34 40.713450652 6.67 6.45 5.79     G1V 186 1
7 * eta Eri PM* 02 56 25.6494839 -08 53 53.322099 5.97 4.99 3.87 3.08 2.50 K1+IIIb 181 0
8 * eps For PM* 03 01 37.6304831834 -28 05 29.376723799   6.68 5.85     G9:V 166 0
9 HD 18885 * 03 01 56.1189723705 -09 57 41.050973426   6.939 5.837     K1III 42 0
10 * omi Tau SB* 03 24 48.7914590778 +09 01 43.994132248 5.090 4.490 3.600 2.92 2.47 G6III 219 0
11 * y Eri * 03 37 05.6791528245 -40 16 28.740766703 6.39 5.62 4.58 3.74 3.17 K1III 56 0
12 * h Eri HB* 03 42 50.0552747 -37 18 48.659746   5.783 4.583     K1.5IIIbCN0.5 57 0
13 * rho For RG* 03 47 56.0407172208 -30 10 04.380679097   6.52 5.54     G6III 56 0
14 * alf Ret PM* 04 14 25.4841381 -62 28 25.891671 4.90 4.27 3.36 2.71 2.27 G8IIIa: 108 0
15 HD 26923 PM* 04 15 28.8004956278 +06 11 12.699896698 6.910 6.860   5.9   G0IV 192 0
16 * gam Tau ** 04 19 47.6038491 +15 37 39.515422 5.46 4.64 3.65 4.83   G9.5IIIabCN0.5 521 0
17 * del Tau SB* 04 22 56.1010361735 +17 32 33.055967140 5.56 4.74 3.76 5.56   G9.5IIICN0.5 500 0
18 * eps Lep PM* 05 05 27.6653698 -22 22 15.723893 6.41 4.64 3.18 2.08 1.27 K4III 146 0
19 * omi Col PM* 05 17 29.0892938 -34 53 42.744408 6.62 5.83 4.83 4.09 3.54 K1IV 80 0
20 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15466 1
21 * lam Dor * 05 26 19.2666877189 -58 54 45.067948687   6.107 5.129     G8III 38 0
22 HD 36848 * 05 32 51.4129167133 -38 30 48.119001540   6.687 5.456     K2/3III 29 0
23 * nu.02 CMa PM* 06 36 41.0375756 -19 15 21.165905 5.96 5.011 3.91 3.13 2.61 K1.5III-IVFe1 246 1
24 HD 47536 PM* 06 37 47.6181076691 -32 20 23.040481884   6.43 5.258     K1III 94 1
25 * tet CMa PM* 06 54 11.3997692336 -12 02 19.061054441 7.20 5.51 4.08 2.95 2.17 K3/4III 209 0
26 * alf Mon PM* 07 41 14.8325688 -09 33 04.071083 5.83 4.95 3.93 3.16 2.64 G9.5III-IIIbFe-0.5 187 0
27 HD 62644 ** 07 42 57.0929163265 -45 10 23.216409952   5.84 5.04     G8IV-V 112 0
28 HD 62902 PM* 07 46 02.1908054187 -06 46 21.047597872   6.888 5.496     K5III 44 0
29 * 6 Pup PM* 07 49 41.2012025731 -17 13 42.264757552   6.462 5.162     K3III 52 0
30 * 27 Mon PM* 07 59 44.1536824502 -03 40 46.501791759   6.137 4.934     K1III 79 0
31 HD 70982 * 08 21 07.6386877458 -64 06 21.606792612   7.043 6.108     G6/8III 23 0
32 HD 72650 * 08 31 29.5864691525 -54 23 38.433461521   7.641 6.333     K3III 20 0
33 * alf Hya * 09 27 35.24270 -08 39 30.9583 5.14 3.42 1.97 0.93 0.16 K3IIIa 415 0
34 HD 83441 * 09 37 28.4007675693 -36 05 45.574607306   7.083 5.950     K2III 20 0
35 HD 85035 * 09 48 47.0377594932 -19 18 48.903264248   8.10 7.02     K1III 17 0
36 HD 90957 PM* 10 29 28.9734162313 -29 39 49.793640391   6.992 5.565     K3III 31 0
37 * 33 Sex PM* 10 41 24.1859207379 -01 44 29.366215211   7.145 6.250     G9IV 157 0
38 * m Leo PM* 10 46 24.5460025885 +18 53 29.475859361   6.640 5.492     K3III 62 0
39 HD 93773 PM* 10 48 41.4695007850 -47 44 59.624863586   7.46 6.50     G8III 16 0
40 * eps Crt * 11 24 36.5904786153 -10 51 33.557849078   6.338 4.802     K4III 86 0
41 HD 101321 PM* 11 39 30.1652007688 -13 11 03.722636129   7.81 6.80     K0III 16 0
42 * eps Cru PM* 12 21 21.6093625 -60 24 04.129070   5.01 3.59     K3III 85 0
43 * chi Vir ** 12 39 14.7669232892 -07 59 44.041075962   5.886 4.643 6.45   K2+IIICN0.5 136 1
44 HD 111884 PM* 12 53 04.1639829235 -54 57 08.902700447   7.217 5.908     K2III 23 0
45 * eps Vir PM* 13 02 10.5978496 +10 57 32.941443 4.45 3.71 2.79 2.16 1.71 G8III-IIIb 527 0
46 HD 115478 * 13 17 15.6282353768 +13 40 32.700484933 8.130 6.630 5.330     K3III 67 0
47 HD 122430 * 14 02 22.7817289987 -27 25 47.199212657   6.799 5.469     K2/3III 40 1
48 * 20 Boo PM* 14 19 45.2350539949 +16 18 24.995504868       4.1   K3III 149 0
49 * del Oct PM* 14 26 55.2324425 -83 40 04.386830   5.615 4.304     K2III 39 0
50 * R Aps PM* 14 57 52.9827420078 -76 39 45.562563855   6.811 5.359     K4III: 29 0
51 HD 136014 PM* 15 19 31.7205806277 -37 05 49.772625381   7.142 6.178     G8III/IV 28 0
52 HD 148760 * 16 31 22.8477059946 -26 32 15.518404431   7.169 6.081     K1III 37 0
53 * eta Ara * 16 49 47.1565275 -59 02 28.957499   5.306 3.744     K5III 63 0
54 * zet02 Sco PM* 16 54 35.0043467 -42 21 40.740679   4.99 3.62     K3III 70 0
55 * eps01 Ara * 16 59 35.0487987 -53 09 37.571300   5.489 4.050     K3III 49 0
56 CD-49 11401 * 17 24 41.5352500573 -49 59 06.472606126   11.401 10.363     ~ 29 0
57 CD-49 11402 * 17 24 46.7175582312 -49 54 06.990074317   12.027 10.894     ~ 30 0
58 IC 4651 OpC 17 24 49 -49 56.0           ~ 322 0
59 IC 4651 29 * 17 24 49.4896781310 -49 57 26.934679880   12.03 10.90     K0III 25 0
60 CD-49 11410 * 17 24 57.7598325878 -50 01 32.957880075   11.89 10.78     ~ 22 0
61 IC 4651 64 * 17 25 01.2734927328 -49 53 52.902180625   12.81 11.989     ~ 14 0
62 IC 4651 812 * 17 25 03.0269849598 -50 04 17.562257079   12.01 11.09     ~ 12 0
63 HD 159194 * 17 35 06.2775008685 -38 47 58.095898115   7.99 6.76     K3III 12 0
64 * 71 Oph * 18 07 18.3588843509 +08 44 01.918091638   5.592 4.640     G8III 166 0
65 HD 169370 RG* 18 24 42.1275107629 -07 04 33.359158917   7.447 6.296     K0/1III 23 0
66 * kap Tel PM* 18 52 39.6443585621 -52 06 26.542660007   6.138 5.173     G8/K0III 30 0
67 * eta Sct PM* 18 57 03.6702664576 -05 50 46.730466051   5.904 4.818     K1-III 95 0
68 HD 177389 PM* 19 09 52.8681650177 -68 25 28.021373885   6.205 5.305     K0IV 31 0
69 HD 179799 PM* 19 14 16.0186701874 -08 43 08.675830464   7.53 6.54     K4III 24 0
70 HD 187195 * 19 49 02.2035774449 -10 52 14.777785948 8.64 7.28 6.04     K2III 38 0
71 * gam Sge PM* 19 58 45.4286265 +19 29 31.728079 6.97 5.04 3.47 2.27 1.35 M0-III 244 0
72 * eta Sge PM* 20 05 09.4931440591 +19 59 27.856193232   6.139 5.093     K2III 83 0
73 * alf Mic * 20 49 58.0767496899 -33 46 46.997429373   5.879 4.890     G8III 35 0
74 HD 198431 PM* 20 50 41.7766331839 -12 32 41.654232090   6.948 5.872     K1III 29 0
75 * 18 Del PM* 20 58 25.9336470966 +10 50 21.426095258   6.432 5.506     G6III 78 1
76 * 3 Psc * 23 00 37.9071898242 +00 11 09.133877584   7.109 6.224     G8/K0III 31 0
77 * 5 Psc PM* 23 08 40.9095327701 +02 07 40.355833093       4.9   G6IIIb 88 0
78 * gam Psc PM* 23 17 09.9374911 +03 16 56.237975 5.20 4.62 3.70 2.98 2.47 G9III:Fe-2 255 0
79 * 27 Psc ** 23 58 40.3770768 -03 33 21.537918   5.814 4.886     G8III 98 0

    Equat.    Gal    SGal    Ecl

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2021.07.29-17:23:25

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