2014ApJ...791...32R


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST16:16:43

2014ApJ...791...32R - Astrophys. J., 791, 32 (2014/August-2)

New detections of arsenic, selenium, and other heavy elements in two metal-poor stars.

ROEDERER I.U., SCHATZ H., LAWLER J.E., BEERS T.C., COWAN J.J., FREBEL A., IVANS I.I., SNEDEN C. and SOBECK J.S.

Abstract (from CDS):

We use the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope to obtain new high-quality spectra covering the 1900 ≤ λ ≤ 2360 Å wavelength range for two metal-poor stars, HD 108317 and HD 128279. We derive abundances of Cu II, Zn II, As I, Se I, Mo II, and Cd II, which have not been detected previously in either star. Abundances derived for Ge I, Te I, Os II, and Pt I confirm those derived from lines at longer wavelengths. We also derive upper limits from the non-detection of W II, Hg II, Pb II, and Bi I. The mean [As/Fe] ratio derived from these two stars and five others in the literature is unchanged over the metallicity range -2.8 < [Fe/H] ←0.6, < [As/Fe] > = +0.28±0.14 (σ = 0.36 dex). The mean [Se/Fe] ratio derived from these two stars and six others in the literature is also constant, < [Se/Fe] > = +0.16±0.09 (σ = 0.26 dex). The As and Se abundances are enhanced relative to a simple extrapolation of the iron-peak abundances to higher masses, suggesting that this mass region (75 ≤ A ≤ 82) may be the point at which a different nucleosynthetic mechanism begins to dominate the quasi-equilibrium α-rich freezeout of the iron peak. < [Cu II/Cu I] > = +0.56±0.23 in HD 108317 and HD 128279, and we infer that lines of Cu I may not be formed in local thermodynamic equilibrium in these stars. The [Zn/Fe], [Mo/Fe], [Cd/Fe], and [Os/Fe] ratios are also derived from neutral and ionized species, and each ratio pair agrees within the mutual uncertainties, which range from 0.15 to 0.52 dex.

Abstract Copyright:

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: individual: (HD 108317, HD 128279) - stars: Population II

Simbad objects: 10

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Number of rows : 10

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 BD+44 493 Pe* 02 26 49.7388403813 +44 57 46.526253277   9.63 9.11     CEMP-no 85 0
2 HD 84937 PM* 09 48 56.09801 +13 44 39.3237 8.49 8.68 8.32 7.97 7.70 F8Vm-5 723 0
3 HD 108317 Pe* 12 26 36.8316698542 +05 18 09.021203658       7.7   G2IVm-5 147 0
4 HD 122563 Pe* 14 02 31.8456299772 +09 41 09.942736952 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 758 0
5 HD 126238 Pe* 14 25 29.9570911985 -43 38 36.947126248   8.44 7.68 7.44   G3/8wF0/2 103 1
6 HD 128279 Pe* 14 36 48.5106582134 -29 06 46.610625293 8.64 8.63 8.00     Gw 172 0
7 * chi Lup SB* 15 50 57.5382881 -33 37 37.795321 3.77 3.909 3.946     B9III 289 0
8 BD+17 3248 HB* 17 28 14.4691668039 +17 30 35.848406966   10.02 9.34     KIIvw 200 0
9 HD 160617 PM* 17 42 49.3235999900 -40 19 15.505712142   9.18 8.73 8.394 8.065 G0 183 0
10 BPS CS 22892-0052 Pe* 22 17 01.6558480594 -16 39 27.051900047   14.03 13.20 13.06 12.19 KIIvw 413 0

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2020.10.21-16:16:43

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