2008A&A...492..823B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST19:39:49

2008A&A...492..823B - Astronomy and Astrophysics, volume 492, 823-831 (2008/12-4)

NLTE abundances of Mn in a sample of metal-poor stars.

BERGEMANN M. and GEHREN T.

Abstract (from CDS):

Following our solar work, we perform NLTE calculations of the Mn abundance for fourteen stars with [Fe/H] from 0 to -2.5, mainly to show how NLTE affects Mn abundances in cool stars of different metallicities. The spectrum synthesis and Mn abundances are based on statistical equilibrium calculations using various estimates for the influence of hydrogen collisions. The NLTE abundances of Mn in all studied stars are systematically higher than the LTE abundances. At low metallicities, the NLTE abundance corrections may run up to 0.5-0.7dex. Instead of a strong depletion of Mn relative to Fe in metal-poor stars as found by the other authors, we only find slightly subsolar values of [Mn/Fe] throughout the range of metallicities analyzed here. The [Mn/Fe] trend in metal-poor stars is inconsistent with the predictions of galactic chemical evolution models, where Mn is less produced than Fe.

Abstract Copyright:

Journal keyword(s): line: profiles - line: formation - stars: abundances - nuclear reactions, nucleosynthesis, abundances

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 19445 PM* 03 08 25.5884 +26 19 51.400 8.29 8.52 8.06 7.60 7.27 G2VFe-3 739 0
2 HD 25329 PM* 04 03 14.9983565018 +35 16 23.806254921 9.75 9.37 8.50 7.75 7.23 K1VbFe-2 347 0
3 HD 29907 SB* 04 38 22.4006754245 -65 24 57.599417729   10.52 9.91     F8V 87 0
4 HD 34328 PM* 05 13 05.2763883242 -59 38 44.266050124   9.95 9.46     G0wA8V 118 0
5 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1757 0
6 HD 84937 PM* 09 48 56.09801 +13 44 39.3237 8.49 8.68 8.32 7.97 7.70 F8Vm-5 717 0
7 HD 102200 Pe* 11 45 34.2344518332 -46 03 46.386462682   9.13 8.76     F2V 95 0
8 HD 103095 PM* 11 52 58.7683801554 +37 43 07.240082865 7.38 7.20 6.45 5.80 5.35 K1V_Fe-1.5 746 1
9 BD-04 3208 PM* 12 07 15.0719832426 -05 44 01.609304815   10.40 9.99     A7 133 0
10 HD 122196 PM* 14 01 02.1244272306 -38 03 03.297565043   9.19 8.75     F0(V)w 107 0
11 HD 122563 Pe* 14 02 31.8456299772 +09 41 09.942736952 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 746 0
12 HD 140283 Pe* 15 43 03.0967798658 -10 56 00.595803430 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 852 0
13 BD+02 3375 PM* 17 39 45.5950264172 +02 24 59.607595293 10.18 10.40 9.92 9.47 9.12 A5 181 0
14 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1737 2
15 HD 200580 SB* 21 04 07.4073421467 +02 59 40.012308707 7.82 7.85   7.0   F9V 151 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-19:39:49

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