2010A&A...523A..71G


Query : 2010A&A...523A..71G

2010A&A...523A..71G - Astronomy and Astrophysics, volume 523, A71-71 (2010/11-2)

Chemical composition of A and F dwarfs members of the Hyades open cluster.

GEBRAN M., VICK M., MONIER R. and FOSSATI L.

Abstract (from CDS):

Abundances of 15 chemical elements have been derived for 28 F and 16 A stars members of the Hyades open cluster in order to set constraints on self-consistent evolutionary models that include radiative and turbulent diffusion. A spectral synthesis, iterative procedure was applied to derive the abundances from selected high-quality lines in high-resolution, high-signal-to-noise spectra obtained with SOPHIE and AURELIE at the Observatoire de Haute Provence. The abundance patterns found for A and F stars in the Hyades resemble those observed in Coma Berenices and Pleiades clusters. In graphs representing the abundances versus the effective temperature, A stars often display much more scattered abundances around their mean values than the coolest F stars do. Large star-to-star variations are detected in the Hyades A dwarfs in their abundances of C, Na, Sc, Fe, Ni, Sr, Y, and Zr, which we interpret as evidence of transport processes competing with radiative diffusion. In A and Am stars, the abundances of Cr, Ni, Sr, Y, and Zr are found to be correlated with that of Fe as in the Pleiades and in Coma Berenices. The ratios [C/Fe] and [O/Fe] are found to be anticorrelated with [Fe/H] as in Coma Berenices. All Am stars in the Hyades are deficient in C and O and overabundant in elements heavier than Fe but not all are deficient in Ca and/or Sc. The F stars have solar abundances for almost all elements except for Si. The overall shape of the abundance pattern of the slow rotator HD 30210 cannot be entirely reproduced by models including radiative diffusion and different amounts of turbulent diffusion. While part of the discrepancies between derived and predicted abundances could come from non-LTE effects, including competing processes such as rotational mixing and/or mass loss seems necessary in order to improve the agreement between the observed and predicted abundance patterns.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: rotation - open clusters and associations: individual: Hyades - diffusion

VizieR on-line data: <Available at CDS (J/A+A/523/A71): table5.dat table6.dat table7.dat table8.dat>

Simbad objects: 49

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Number of rows : 49
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * 47 Ari PM* 02 58 05.2213070040 +20 40 07.442238720   6.230   5.6   F0V(e) 178 0
2 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3208 0
3 HD 24357 PM* 03 53 10.0461915456 +17 19 37.507270260   6.294 5.946 5.745 5.545 F4V 175 0
4 HD 25102 PM* 03 59 40.4960115792 +10 19 49.359946008   6.762 6.340 6.097 5.860 ~ 139 0
5 HD 26015 PM* 04 07 41.9838821088 +15 09 46.041084720   6.45 6.07     F3V 154 0
6 HD 26345 PM* 04 10 42.3629157312 +18 25 23.714993208   7.005 6.576 6.329 6.095 F6V 138 0
7 * 45 Tau PM* 04 11 20.2822395072 +05 31 22.987999632   6.057 5.699 5.487 5.284 F4V 234 0
8 * 48 Tau El* 04 15 46.2844734000 +15 24 02.505856392   6.705 6.300 6.070 5.847 F5V 175 0
9 * 55 Tau ** 04 19 54.85720 +16 31 21.3283   7.401 6.853     F8V 238 0
10 * 58 Tau dS* 04 20 36.3103641648 +15 05 43.630164636   5.475 5.242 5.126 4.999 F0IV-V 184 0
11 HD 27524 PM* 04 21 31.6490057568 +21 02 23.557097868   7.215 6.779 6.531 6.283 F5V 163 0
12 HD 27534 PM* 04 21 32.2684884072 +18 25 03.295609536   7.234 6.787 6.532 6.279 F5V 155 0
13 HD 27561 PM* 04 21 34.7949333144 +14 24 35.240373612   6.999 6.578 6.338 6.099 F5IV-V 215 0
14 * 60 Tau dS* 04 22 03.5181398136 +14 04 37.912925064   6.054 5.710 7.05 5.38 A3m 261 0
15 * del02 Tau PM* 04 24 05.7614531616 +17 26 38.871301956 5.07 4.95 4.80 4.64 4.57 A2Vs 228 0
16 HD 27848 PM* 04 24 22.2732237168 +17 04 44.236606296   7.405 6.947 6.698 6.445 ~ 154 0
17 * kap01 Tau PM* 04 25 22.1650526 +22 17 37.937535   4.366 4.201     A7IV-V 176 0
18 * del03 Tau a2* 04 25 29.3847186643 +17 55 40.463442784   4.369 4.298 6.18 4.24 A2IV-Vs 394 0
19 * 70 Tau SB* 04 25 37.3225242048 +15 56 27.683560428   6.951 6.439 7.75   F7V 264 0
20 HD 28226 PM* 04 28 00.7827965760 +21 37 11.650661112   5.996 5.711 5.553 5.406 Am 140 0
21 * tet02 Tau dS* 04 28 39.7416111456 +15 52 15.148738380 3.690 3.600 3.410 5.43   A7III 429 0
22 * b Tau PM* 04 28 50.1636212976 +13 02 51.367198596   5.226 5.014 4.907 4.795 kA5hF0VmF0 183 0
23 HD 28363 ** 04 28 59.7394076568 +16 09 32.714425728   7.101 6.565 6.258 5.966 F8V 186 0
24 HD 28406 PM* 04 29 30.3506853024 +17 51 47.393997696 7.36 7.352 6.890 6.631 6.373 F6V 179 0
25 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2861 0
26 HD 28527 dS* 04 30 33.6326139192 +16 11 38.449696416   4.975 4.764 6.52   A6IV 188 0
27 * 83 Tau ** 04 30 37.3629243168 +13 43 27.848332992   5.655 5.395 5.245 5.093 F0IV 136 0
28 * 81 Tau SB* 04 30 38.8891193184 +15 41 30.760430964   5.739 5.454 6.76   Am 200 0
29 HD 28568 PM* 04 30 46.7980744680 +16 08 55.251488976   6.940 6.491 7.51   ~ 176 0
30 * 85 Tau PM* 04 31 51.7588453752 +15 51 05.846138784   6.342 5.998 5.799 5.604 F1.5Vn 120 0
31 HD 28736 PM* 04 32 04.8085885704 +05 24 36.148166280   6.783 6.352 6.104 5.874 ~ 148 0
32 HD 28911 PM* 04 33 46.6420844064 +13 15 06.784086276   7.031 6.597 6.351 6.108 ~ 119 0
33 * rho Tau dS* 04 33 50.9178322656 +14 50 39.941657592 4.98 4.90 4.65 4.41 4.29 A8V 214 0
34 V* V1116 Tau dS* 04 36 29.1498376560 +23 20 27.021565644   6.418 6.019     F2 109 0
35 HD 29225 PM* 04 36 40.7173312344 +15 52 09.678087120   7.074 6.619 6.371 6.115 ~ 131 0
36 * c Tau PM* 04 38 09.4618938672 +12 30 39.013056648 4.52 4.39 4.27 4.13 4.08 A6V 183 0
37 HD 29499 PM* 04 39 06.1590186912 +07 52 15.553412364   5.623 5.365 5.226 5.093 A5m 111 0
38 * sig02 Tau PM* 04 39 16.5023050 +15 55 04.702951   4.842 4.665     A5Vn 135 0
39 HD 30034 PM* 04 44 25.8285113424 +11 08 46.083452208   5.638 5.379 5.230 5.082 F0V 112 0
40 HD 30210 PM* 04 46 01.7404096416 +11 42 20.112329592   5.566 5.346     Am 148 0
41 HD 30810 ** 04 51 12.5284595938 +11 04 04.881592537   7.322 6.753     F6V 186 1
42 * i Tau dS* 04 51 22.4635311552 +18 50 23.485866432   5.302 5.085 4.964 4.830 A7IV-V 175 0
43 HD 30869A SB* 04 51 49.978609 +13 39 18.53294   6.81 6.36     ~ 179 0
44 HD 30869 ** 04 51 49.9931074392 +13 39 18.486491220   6.751 6.250 7.34 5.674 ~ 185 0
45 HD 31236 PM* 04 54 58.3616755344 +19 29 07.392918948   6.640 6.347 6.172 6.005 F1V(n) 100 0
46 * 101 Tau PM* 04 59 44.3220286320 +15 55 00.236683308   7.220 6.747     F5V 127 0
47 * iot Tau ** 05 03 05.7465241272 +21 35 23.860305924   4.797 4.615     A7V 162 0
48 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1825 0
49 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 415 1

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2022.08.11-20:44:27

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