2013ApJ...765...51L


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.05CEST23:45:56

2013ApJ...765...51L - Astrophys. J., 765, 51 (2013/March-1)

Fluorine abundances of galactic low-metallicity giants.

LI H.N., LUDWIG H.-G., CAFFAU E., CHRISTLIEB N. and ZHAO G.

Abstract (from CDS):

With abundances and 2σ upper limits of fluorine (F) in seven metal-poor field giants, nucleosynthesis of stellar F at low metallicity is discussed. The measurements are derived from the HF(1-0) R9 line at 23358 Å using near-infrared K-band high-resolution spectra obtained with CRIRES at the Very Large Telescope. The sample reaches lower metallicities than previous studies on F of field giants, ranging from [Fe/H] = -1.56 down to -2.13. Effects of three-dimensional model atmospheres on the derived F and O abundances are quantitatively estimated and shown to be insignificant for the program stars. The observed F yield in the form of [F/O] is compared with two sets of Galactic chemical evolution models, which quantitatively demonstrate the contribution of Type II supernova (SN II) ν-process and asymptotic giant branch/Wolf-Rayet stars. It is found that at this low-metallicity region, models cannot well predict the observed distribution of [F/O], while the observations are better fit by models considering an SN II ν-process with a neutrino energy of Eν = 3x1053 erg. Our sample contains HD 110281, a retrograde orbiting low-α halo star, showing a similar F evolution as globular clusters. This supports the theory that such halo stars are possibly accreted from dwarf galaxy progenitors of globular clusters in the halo.

Abstract Copyright:

Journal keyword(s): Galaxy: halo - stars: abundances - stars: Population II

Simbad objects: 13

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Number of rows : 13

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 V* CM Cet LP? 00 33 14.3107315285 -10 43 42.728505105   10.66 9.48 8.84 9.06 G3/5V 89 0
2 V* HP Eri LP* 04 38 55.7330333369 -13 20 48.133826226 10.91 9.72 8.33     G8/K0IIIwF7 127 0
3 V* KR Vir LP* 12 41 03.6204109267 -00 37 13.818893456 12.628 10.962 9.370 8.538 7.779 KIIvw 62 0
4 CD-32 9096 RG* 13 02 00.5555343528 -33 09 11.199164304   11.54 10.39     KIIvw 17 0
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3100 0
6 HD 118055 Pe* 13 34 39.9107417779 -16 19 22.709593766   10.10 8.89 8.45   K0wF8 76 0
7 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2170 0
8 BD+01 2916 Pe* 14 21 45.2616002321 +00 46 59.172388634   10.93 9.65     KIIvw 83 0
9 HD 135148 SB* 15 13 17.4566658985 +12 27 25.536244668   10.87 9.39 8.97   CEMP-s 89 0
10 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1712 0
11 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1252 0
12 NGC 6712 GlC 18 53 04.32 -08 42 21.5   9.85 8.69     ~ 476 0
13 NAME Galactic Bulge reg ~ ~           ~ 3574 0

    Equat.    Gal    SGal    Ecl

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2021.05.05-23:45:56

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