2009A&A...499..103S


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST03:27:26

2009A&A...499..103S - Astronomy and Astrophysics, volume 499, 103-119 (2009/5-3)

Beryllium abundances and star formation in the halo and in the thick disk.

SMILJANIC R., PASQUINI L., BONIFACIO P., GALLI D., GRATTON R.G., RANDICH S. and WOLFF B.

Abstract (from CDS):

Beryllium is a pure product of cosmic ray spallation. This implies a relatively simple evolution in time of the beryllium abundance and suggests its use as a time-like observable. Our goal is to derive abundances of Be in a sample of 90 stars, the largest sample of halo and thick disk stars analyzed to date. We study the evolution of Be in the early Galaxy and its dependence on kinematic and orbital parameters, and investigate its use as a cosmochronometer. Abundances of Be, Fe, and α-elements of 73 stars are employed to study the formation of the halo and the thick disk of the Galaxy. Beryllium abundances are determined from high-resolution, high signal-to-noise UVES spectra with spectrum synthesis. Atmospheric parameters and abundances of α-elements are adopted from the literature. Lithium abundances are used to eliminate mixed stars from the sample. The properties of halo and thick disk stars are investigated in diagrams of log(Be/H) vs. [α/H], log(Be/H) vs. [Fe/H], and [α/Fe] vs. log(Be/H) and with orbital and kinematic parameters. We present our observational results in various diagrams. (i) In a log(Be/H) vs. [Fe/H] diagram we find a marginal statistical detection of a real scatter, above what is expected from measurement errors, with a larger scatter among halo stars. The detection of the scatter is further supported by the existence of pairs of stars with identical atmospheric parameters and different Be abundances; (ii) in a log(Be/H) vs. [α/Fe] diagram, the halo stars separate into two components; one is consistent with predictions of evolutionary models, while the other has too high α and Be abundances and is chemically indistinguishable from thick disk stars. This suggests that the halo is not a single uniform population where a clear age-metallicity relation can be defined; (iii) In diagrams of Rmin vs. [α/Fe] and log(Be/H), the thick disk stars show a possible decrease in [α/Fe] with Rmin, whereas no dependence of Be with Rmin is seen. This anticorrelation suggests that the star formation rate was lower in the outer regions of the thick disk, pointing towards an inside-out formation. The lack of correlation for Be indicates that it is insensitive to the local conditions of star formation.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: late-type - Galaxy: halo - Galaxy: disk

Simbad objects: 96

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Number of rows : 96

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 * 85 Peg SB* 00 02 10.3411392575 +27 04 54.476788744 6.47 6.42 5.75 5.16 4.73 G5VbFe-2 532 0
2 HD 3567 PM* 00 38 31.9476246205 -08 18 33.395481958 9.54 9.70 9.23     F7/8wF3 196 0
3 CD-61 282 PM* 01 36 05.8498088859 -61 05 03.493817197   10.63 10.10     G0 62 0
4 BD+29 366 PM* 02 10 24.5274383291 +29 48 23.663384860 9.27 9.35 8.77 8.24 7.85 G3 127 0
5 BD-01 306 PM* 02 14 40.2992022335 -01 12 05.123755516 9.60 9.631 9.066 8.712 8.377 G0 137 0
6 HD 16031 PM* 02 34 11.0485506243 -12 23 03.445493985 9.99 10.21 9.77     F0V 158 1
7 HD 17820 PM* 02 51 58.3549892835 +11 22 11.936962577 8.85 8.92   8.0   G5 102 0
8 * eps For PM* 03 01 37.6304831834 -28 05 29.376723799   6.68 5.85     G9:V 165 0
9 HD 19445 PM* 03 08 25.5884 +26 19 51.400 8.29 8.52 8.06 7.60 7.27 G2VFe-3 746 0
10 G 5-19 PM* 03 11 26.5408307448 +12 37 09.570143650   11.77   11.0   ~ 44 0
11 BD+20 571 PM* 03 27 39.4524583375 +21 02 34.997258945   11.36   10.8   G0 55 0
12 CD-24 1782 Pe* 03 38 41.4850901452 -24 02 50.291489698   10.54 9.97 9.246 8.811 ~ 73 0
13 HD 22879 Pe* 03 40 22.0654223510 -03 13 01.124769689 7.146 7.222 6.667 6.346 6.016 G0VmF2 449 0
14 HD 25704 ** 04 01 44.6318109883 -57 12 24.595289561   8.65 8.10     F7V 139 0
15 HD 25673 PM* 04 04 20.3027980093 -04 39 18.496332469   10.36 9.56     G8V 60 0
16 BD-06 855 PM* 04 14 58.1069690964 -05 37 48.859109554   11.278 10.601 10.192 9.794 ~ 72 0
17 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2758 0
18 HD 29907 SB* 04 38 22.4006754245 -65 24 57.599417729   10.52 9.91     F8V 89 0
19 HD 31128 PM* 04 52 09.9097489102 -27 03 50.940327190   9.55 9.14     F3/5Vw 125 0
20 HD 241253 PM* 05 09 56.9590196910 +05 33 26.743378965   10.24   9.4   G0 89 0
21 HD 34328 PM* 05 13 05.2763883242 -59 38 44.266050124   9.95 9.46     G0wA8V 123 0
22 HD 46341 PM* 06 32 37.9911853832 -06 29 18.503591738   9.16 8.60     G2V 71 0
23 CD-25 3416 PM* 06 37 14.6318456448 -25 21 39.799789749   10.29 9.63     G5 39 0
24 CD-33 3337 PM* 06 54 47.8102286237 -33 44 49.020854453   9.56 9.03     F5 88 0
25 HD 51754 PM* 06 58 38.5387307770 -00 28 49.697886299 9.60 9.567 9.009 8.663 8.334 G2V 116 0
26 CD-57 1633 HV* 07 06 28.9517777029 -57 27 29.118056344   10.04 9.54     F7V 93 0
27 HD 59374 PM* 07 30 29.0167349664 +18 57 40.617055091   9.03   8.2   F9 109 0
28 HD 59984 PM* 07 32 05.7631181661 -08 52 52.773345653   6.431 5.916     G0VFe-1.6CH-0.5 193 0
29 CD-45 3283 PM* 07 34 18.5967102074 -45 16 42.875165214   11.08 10.43     G8V-VI 69 0
30 HD 60319 PM* 07 34 35.1080318077 +16 54 04.031855106   9.46   8.6   F8 88 0
31 * 171 Pup PM* 07 45 34.9191268687 -34 10 21.283643355   5.909 5.362     F9V 284 0
32 HD 64606 SB* 07 54 34.1796660767 -01 24 44.207014054 8.32 8.165 7.433 7.007 6.569 K0V 236 0
33 HD 74000 PM* 08 40 50.8038415228 -16 20 42.513275817 9.84 10.09 9.66     F2 251 0
34 HD 76932 PM* 08 58 43.9328634171 -16 07 57.805389219 6.47 6.39 5.86     G2VFe-1.8CH-1 371 0
35 BD-03 2525 SB* 08 59 10.1107779329 -04 01 36.503689325   10.114 9.648 9.335 9.005 F3 123 0
36 G 46-31 SB* 09 17 04.0012875687 +03 01 29.628025488   11.39   10.6   ~ 62 0
37 HD 80046 * 09 17 32.9314944986 +00 33 17.589688120   7.13 6.96     A0IV 13 0
38 HD 84937 PM* 09 48 56.09801 +13 44 39.3237 8.49 8.68 8.32 7.97 7.70 F8Vm-5 734 0
39 HD 88725 PM* 10 14 08.3345668419 +03 09 04.675865338 8.34 8.33 7.73 7.24 6.89 G3/5V 177 0
40 BD+29 2091 PM* 10 47 23.1625623007 +28 23 55.928286438   10.72   10.1   F5 130 0
41 HD 94028 PM* 10 51 28.1254469804 +20 16 38.965521484 8.51 8.69 8.22 7.82 7.54 F8 337 0
42 HD 97916 SB* 11 15 54.2294079228 +02 05 11.982106821 9.50 9.61   8.9   F0V 159 0
43 BD+26 2251 PM* 11 44 35.7048923618 +25 32 11.691354184   10.82   9.9   F6 83 0
44 BD-21 3420 PM* 11 55 28.4583234970 -22 23 13.322785163   10.649 10.107     F5 60 0
45 HD 105004 PM* 12 05 24.8526214531 -26 35 43.746369085   10.96 10.39     F9 97 0
46 HD 106038 PM* 12 12 01.3690548563 +13 15 40.620671155 10.45 10.630 10.162 9.851 9.539 F6wl 177 0
47 HD 106516 SB* 12 15 10.55731 -10 18 44.6354 6.44 6.57 6.11     F9VFe-1.7CH-0.7 393 0
48 HD 108177 PM* 12 25 34.9568983381 +01 17 02.259993860 9.87 10.09 9.66 9.21 8.89 F0V 238 0
49 HD 111980 SB* 12 53 15.0528185218 -18 31 20.009066873 8.80 8.91 8.38     F7V 159 0
50 HD 113083 PM* 13 01 26.2705714279 -27 22 28.311075823   8.58 8.05     G1V 96 0
51 HD 113679 PM* 13 05 52.8243888123 -38 30 59.990798799   10.342 9.797     G2/3V 87 0
52 HD 114762 SB* 13 12 19.7467346230 +17 31 01.611425890 7.78         F9VgF8mF4+M6?V 520 1
53 BD+13 2698 ** 13 39 59.57275 +12 35 21.6837   9.94   9.0   F9V 80 0
54 HD 120559 PM* 13 51 40.3897554726 -57 26 08.293465228 8.679 8.647 7.982 7.605 7.217 G7VFe-1.4CH-1 142 0
55 HD 121004 PM* 13 53 58.1163515488 -46 32 19.526169178   10.112 9.522     G2V 133 0
56 HD 126681 PM* 14 27 24.9096361739 -18 24 40.457119166   9.939 9.535     G3V 171 0
57 Ross 50 PM* 14 34 51.1108673462 +25 10 03.233569951   13.38   12.1   ~ 45 0
58 HD 128279 Pe* 14 36 48.5106582134 -29 06 46.610625293 8.64 8.63 8.00     Gw 179 0
59 BD+26 2606 SB* 14 49 02.3550036151 +25 42 09.136461939 9.92 10.16 9.73 9.27 8.95 A5 357 0
60 HD 132475 PM* 14 59 49.7649807130 -22 00 45.814964574 8.98 9.11 8.55     F5/6V 230 1
61 G 66-51 PM* 15 00 50.0691059415 +02 07 37.456014679   11.34   10.1   K0 32 0
62 HD 134088 PM* 15 08 12.5670991059 -07 54 47.535631396   9.266 9.018     G2/3(V) 97 0
63 HD 134169 SB* 15 08 18.0562462154 +03 55 50.107808860 8.14 8.22 7.70     F7V 201 0
64 HD 142575 PM* 15 55 02.8362623172 +05 04 12.163144327   9.00   8.4   F0 65 0
65 Ross 530 ** 16 19 51.6622658589 +22 38 20.320864922   12.23 11.49 11.46   sdG2 55 0
66 HD 148816 PM* 16 30 28.4586643435 +04 10 41.603810207 7.75 7.81 7.28 6.82 6.49 F7V 290 0
67 HD 149414 SB* 16 34 42.3556924921 -04 13 44.634894711 10.48 10.37 9.63     G5Ve 191 0
68 G 170-21 PM* 17 09 15.5487936786 +22 44 09.425879523       12.0   ~ 16 0
69 HD 159307 PM* 17 34 08.4273732832 -03 03 20.168620430   7.84 7.39     F3V 78 0
70 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1833 1
71 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12183 0
72 BD+20 3603 PM* 17 54 43.2306261669 +20 16 16.443521966   10.13   9.6   F0 152 0
73 HD 163810 ** 17 58 38.4538029750 -13 05 49.654844460 10.15 10.23 9.63     G3V 139 0
74 HD 175179 PM* 18 54 23.2030233107 -04 36 18.624524830 9.56 9.61 9.03     G5V 110 0
75 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1847 0
76 HD 179626 PM* 19 13 20.7187369501 -00 35 42.340961173   9.701 9.187 8.844 8.489 F5V 118 0
77 HD 188510 PM* 19 55 09.6783577203 +10 44 27.395091177 9.30 9.41   8.5   G5V: 239 0
78 HD 189558 PM* 20 01 00.2452564415 -12 15 20.355884232   8.27 7.72     F8/G2V 175 1
79 HD 193901 PM* 20 23 35.8472360557 -21 22 14.228814044 9.08 9.22 8.67 8.17 7.87 F7V 262 0
80 HD 194598 PM* 20 26 11.9185966774 +09 27 00.429262518 8.62 8.82 8.34 7.90 7.56 F8 291 0
81 HD 195633 PM* 20 32 23.9917031781 +06 31 03.251333868 9.05 9.03 8.52     G0Vw 131 0
82 HD 199289 PM* 20 58 08.5241060028 -48 12 13.460660433   8.82 8.30     F5V 108 0
83 HD 201889 ** 21 11 59.52350 +24 10 05.3897 8.60 8.64 8.05 7.52 7.15 G1V 151 0
84 * gam Pav PM* 21 26 26.6048372 -65 21 58.314484 4.57 4.70 4.22 3.75 3.45 F9VFe-1.4CH-0.7 382 0
85 HD 204155 PM* 21 26 42.9051661431 +05 26 29.899070605   9.03   8.1   F7V 121 0
86 G 26-12 PM* 21 33 36.5717515983 +00 23 43.911553663   12.59 12.15 11.9   sdF5: 43 0
87 * 15 Peg PM* 21 52 29.9167067804 +28 47 36.751682373 5.82 5.95 5.53     F2V 230 0
88 HD 208906 PM* 21 58 40.8319509283 +29 48 45.457435407 7.35 7.47 6.96 6.53 6.22 G0VmF2 165 0
89 BD+11 4725 SB* 22 05 40.6986865279 +12 22 36.239672531   10.19   9.2   G3 85 0
90 BD+17 4708 SB* 22 11 31.3751899315 +18 05 34.158392398 9.73 9.91 9.46 9.03 8.70 sdF8 545 0
91 HD 210752 PM* 22 12 43.53757 -06 28 08.1198   7.92 7.40     G1V 109 0
92 HD 215257 PM* 22 43 50.7183139841 +03 53 12.629544211   7.93   7.1   F5V 140 0
93 HD 218502 PM* 23 08 39.3725624892 -15 03 11.944865393   8.65 8.25     F(3)w 91 0
94 HD 219617 ** 23 17 05.04375 -13 51 03.5971 8.41 8.60 8.14 7.70 7.37 F8 301 0
95 BD+02 4651 PM* 23 19 40.4501666092 +03 22 16.692679350   10.67   9.9   sdF6 104 0
96 HD 222766 PM* 23 43 34.9168944594 -07 55 24.016486937   10.769 10.115 9.728 9.349 G5/6V 77 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-03:27:26

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