1995A&A...301..492F

Query : 1995A&A...301..492F

1995A&A...301..492F - Astronomy and Astrophysics, volume 301492-500 (1995/9-2)

Spectroscopic analyses of metal-poor stars. III. Magnesium abundances.

FUHRMANN K., AXER M. and GEHREN T.

Abstract (from CDS):

We present magnesium abundances and Mg/Fe ratios for 56 metal-poor dwarfs and subgiants based on differential LTE model atmosphere analyses of spectra that have a typical S/N of 50-100 and a resolution of about 20000-30000. The distribution of Mg/Fe abundance ratios with Fe abundances is characterized by a steep increase of [Mg/Fe] near [Fe/H]=-0.6. At that iron abundance we recognize an abrupt change from a solar value for stars with [Fe/H]≥-0.6 to an upper limit of +0.4dex for the metal-poor stars. Our data suggest that this step in the Mg/Fe abundance ratio at [Fe/H]=-0.6 is the result of the onset of Galactic disk formation, whereas [Mg/Fe]=+0.4 apparently is an upper limit arising from the constraints of nucleosynthesis in massive SN II events during the first stellar generations, the yields of which we observe in the most metal-poor halo stars.

Abstract Copyright: ∼

Journal keyword(s): nucleosynthesis, abundances - stars: abundances - stars: late-type - stars: subdwarfs - Galaxy: evolution

Simbad objects: 55

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Number of rows : 55
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * 85 Peg SB* 00 02 10.3487193861 +27 04 54.599101714 6.47 6.42 5.75 5.16 4.73 G5VbFe-2 568 0
2 HD 6434 PM* 01 04 40.1502696688 -39 29 17.584220159   8.32 7.71     G2/3V 241 1
3 * mu. Cas SB* 01 08 16.3029454473 +54 55 12.561201263 5.93 5.86 5.17 4.55 4.13 G5Vb 593 1
4 BD+29 366 PM* 02 10 24.5274364299 +29 48 23.663397433 9.27 9.35 8.77 8.24 7.85 G3 146 0
5 HD 16784 SB* 02 40 38.7783197140 -30 08 07.460222152   8.699 8.02     F8V 121 0
6 BD+46 610 SB* 02 41 45.7397605656 +47 21 01.290205512       8.8   F8 68 0
7 HD 19445 Pe* 03 08 25.5883873084 +26 19 51.400965175 8.29 8.52 8.06 7.60 7.27 G2VFe-3 801 0
8 * zet02 Ret ** 03 18 12.8188824117 -62 30 22.904711032   5.814 5.228     G1V 399 0
9 BD+66 268 PM* 03 31 17.4003449284 +66 43 49.024902152 10.48 10.57 9.91 9.30 8.87 G0 181 0
10 HD 22879 Pe* 03 40 22.0652879951 -03 13 01.124265616 7.146 7.222 6.667 6.346 6.016 G0VmF2 529 0
11 HD 31128 PM* 04 52 09.9097086888 -27 03 50.940147636   9.55 9.14     F3/5Vw 149 0
12 BD+03 740 HB* 05 01 16.6226363256 +04 06 37.021736844 9.97 10.17 9.7 9.6   sdF0 182 0
13 HD 250792 Pe* 06 03 14.8636143602 +19 21 38.696218609 9.89 9.898 9.310 8.954 8.547 G1 177 0
14 BD+37 1458 Pe* 06 16 01.5222885381 +37 43 18.754343426 9.41 9.52 8.92 8.34 7.91 G0 146 0
15 HD 45282 Pe* 06 26 40.7720940072 +03 25 29.792391024 8.71 8.69 8.03     Gwl 164 0
16 HD 46341 PM* 06 32 37.9911814872 -06 29 18.504485016   9.16 8.60     G2V 82 0
17 HD 51929 PM* 06 55 53.2199607424 -56 56 32.625629720   8.02 7.43     G2VFe-1.4CH-0.7 134 0
18 HD 64090 Pe* 07 53 33.1208795337 +30 36 18.256204963 8.75 8.86 8.25 7.70 7.30 K0:V_Fe-3 374 0
19 HD 69611 PM* 08 17 29.3481646355 -03 59 22.623439715   8.32 7.74     G0V 159 0
20 HD 74000 Pe* 08 40 50.8036114756 -16 20 42.516208237 9.84 10.09 9.66     F2 279 0
21 Ross 889 Pe* 09 40 43.2053340378 +01 00 29.511836741       10.39   sdA4 166 0
22 HD 87140 PM* 10 04 43.1808079344 +54 20 43.425537648 9.70 9.68 8.98     K0 120 0
23 HD 298986 PM* 10 17 14.8774744591 -52 29 18.694800089   10.46 10.03   9.48 F5 97 0
24 HD 91345 Pe* 10 30 04.6048336584 -71 33 39.248662428   9.757 9.510     G0wF3 85 0
25 HD 97855B PM* 11 16 03.6538385472 +52 46 35.315845284   8.53   7.4   G0V 52 0
26 HD 97855 PM* 11 16 04.0344771096 +52 46 23.384130708       6.2   F6VgF6mF3 107 0
27 HD 99383 Pe* 11 25 49.8351777360 -38 52 16.936102452   9.56 9.08     F2V 85 0
28 HD 101227 PM* 11 39 06.2189103744 +44 18 20.295031968 9.14 9.08   8.0   G0 74 1
29 HD 106516 SB* 12 15 10.55731 -10 18 44.6354 6.44 6.57 6.11     F9VFe-1.7CH-0.7 443 0
30 HD 108076 PM* 12 24 45.8890146375 +38 19 07.459717466   8.58   7.7   G0V 120 0
31 HD 108177 PM* 12 25 34.9568267745 +01 17 02.259553591 9.87 10.09 9.66 9.21 8.89 F0V 266 0
32 HD 114762 SB* 13 12 19.7410686234 +17 31 01.630334317 7.78         F9VgF8mF4+M6?V 570 1
33 HD 116064 Pe* 13 21 43.7779908364 -39 18 40.025179966   9.26 8.8     F9IV-Vm-5 137 0
34 HD 118659 PM* 13 38 00.4711997282 +19 08 53.098205358 9.58 9.47   8.4   G4V 95 0
35 HD 120559 SB* 13 51 40.3987847839 -57 26 08.350982731 8.679 8.647 7.982 7.605 7.217 G7VFe-1.4CH-1 168 0
36 HD 121387 PM* 13 58 17.5687615392 -72 19 25.370514408   8.99 8.61     F5wA9(V) 38 0
37 HD 128279 Pe* 14 36 48.5108525999 -29 06 46.612858494 8.64 8.63 8.00     Gw 214 0
38 HD 140283 Pe* 15 43 03.0971190219 -10 56 00.595693188 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 985 0
39 HD 148211 PM* 16 27 12.8994797097 -22 07 36.476820152   8.22 7.69     F8/G0V 140 0
40 HD 158226 PM* 17 26 43.1968765468 +31 04 37.895885806   9.09   8.1   G1V 116 0
41 BD+23 3130 Pe* 17 32 41.6247211304 +23 44 11.625460773     8.9 8.6   G0III 144 0
42 BD+02 3375 Pe* 17 39 45.5948675731 +02 24 59.606824535 10.18 10.40 9.92 9.47 9.12 A5 205 0
43 * b Her SB* 18 07 01.5906608928 +30 33 43.584892488 5.52 5.67 5.13 4.61 4.28 F6V 493 0
44 HD 174912 PM* 18 51 25.1792851207 +38 37 35.654019974       6.8   F8 132 0
45 HD 181720 PM* 19 22 52.9849923689 -32 55 08.589079621   8.44 7.86     G1V 135 1
46 HD 338529 PM* 19 32 31.9104668184 +26 23 26.117367216   9.72   9.2   B5 213 0
47 HD 189558 PM* 20 01 00.2452184673 -12 15 20.353638621   8.28 7.73     F8/G2V 202 0
48 BD+42 3607 Pe* 20 09 01.4132638739 +42 51 54.930960323     10.1 9.9   F3 90 0
49 BD+41 3931 PM* 20 55 16.7551875178 +42 18 00.680491946       10.0   G5 103 0
50 HD 199288 PM* 20 57 40.0687221764 -44 07 45.733001992   7.11 6.52     G2VFe-1.0 209 0
51 HD 201891 Pe* 21 11 59.0321495469 +17 43 39.890919730 7.74 7.88 7.37 6.91 6.59 G5V_Fe-2.5 409 0
52 * gam Pav PM* 21 26 26.6049826473 -65 21 58.313057521 4.57 4.70 4.22 3.75 3.45 F9VFe-1.4CH-0.7 439 0
53 HD 205582 PM* 21 40 23.8516742122 -71 30 12.000935749   7.97 7.43     F8/G0V 41 0
54 * 15 Peg PM* 21 52 29.9168018496 +28 47 36.750679764 5.82 5.95 5.53     F2V 250 0
55 * nu. Ind ** 22 24 36.8853892493 -72 15 19.488237466   5.94 5.29     G9VFe-3.1CH-1.5 290 0

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