2010A&A...513A..72B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.15CEST07:31:51

2010A&A...513A..72B - Astronomy and Astrophysics, volume 513, A72-72 (2010/4-1)

Three carbon-enhanced metal-poor dwarf stars from the SDSS. Chemical abundances from CO5BOLD 3D hydrodynamical model atmospheres.

BEHARA N.T., BONIFACIO P., LUDWIG H.-G., SBORDONE L., GONZALEZ HERNANDEZ J.I. and CAFFAU E.

Abstract (from CDS):

The origin of carbon-enhanced metal-poor stars enriched with both s and r elements is highly debated. Detailed abundances of these types of stars are crucial to understand the nature of their progenitors. The aim of this investigation is to study in detail the abundances of SDSS J1349-0229, SDSS J0912+0216 and SDSS J1036+1212, three dwarf CEMP stars, selected from the Sloan Digital Sky Survey. Using high resolution VLT/UVES spectra (R∼30000) we determine abundances for Li, C, N, O, Na, Mg, Al, Ca, Sc, Ti, Cr, Mn, Fe, Co, Ni and 21 neutron-capture elements. We made use of CO5BOLD 3D hydrodynamical model atmospheres in the analysis of the carbon, nitrogen and oxygen abundances. NLTE corrections for Ci and Oi lines were computed using the Kiel code. We classify SDSS J1349-0229 and SDSS J0912+0216 as CEMP-r+s stars. SDSS J1036+1212 belongs to the class CEMP-no/s, with enhanced Ba, but deficient Sr, of which it is the third member discovered to date. Radial-velocity variations have been observed in SDSS J1349-0229, providing evidence that it is a member of a binary system. The chemical composition of the three stars is generally compatible with mass transfer from an AGB companion. However, many details remain difficult to explain. Most notably of those are the abundance of Li at the level of the Spite plateau in SDSS J1036+1212 and the large over-abundance of the pure r-process element Eu in all three stars.

Abstract Copyright:

Journal keyword(s): stars: individual: SDSS J1349-0229 - stars: individual: SDSS J0912+0216 - stars: individual: SDSS J1036+1212 - stars: abundances - stars: AGB stars: stars: post-AGB

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 - 2020
#notes
1 SKB 2 Pe* 00 41 39.8197261334 -26 18 54.463949137   13.338 12.221 11.704 11.321 C1,2 83 0
2 HE 0107-5240 Pe* 01 09 29.1554552993 -52 24 34.203535506   15.89 15.07 15.10 14.283 CEMP-no 228 0
3 BPS CS 29528-0041 Pe* 02 29 25.2507036195 -18 13 28.042501354 14.83 15.20 14.59 14.67   CEMP-no 25 0
4 2MASS J04442200-4513542 C* 04 44 22.0060297382 -45 13 54.233994954 13.219 13.51 12.989 12.672 12.372 CEMP-s 22 0
5 HE 0557-4840 Pe* 05 58 39.2661082631 -48 39 56.890701762   16.16 15.45 14.991   CEMP-no 81 0
6 SDSS J091243.72+021623.6 Pe* 09 12 43.7230744402 +02 16 23.718454537           CEMP-s 20 0
7 NAME SDSS J1036+1212 Pe* 10 36 49.9302951768 +12 12 19.888898997           CEMP-s 24 0
8 HE 1327-2326 Pe* 13 30 05.9395582011 -23 41 49.699027289 13.761 14.01 13.55 13.50 12.803 CEMP-no 214 0
9 NAME SDSS J1349-0229 Pe* 13 49 13.5415939676 -02 29 42.784321366           CEMP-s 20 0
10 BPS CS 22964-0161 SB* 20 03 25.5362187973 -38 38 35.324239028   14.9 14.41 14.63   CEMP-s 42 0
11 HE 2134-3940 Pe* 21 37 45.7673672486 -39 27 22.314122762   13.790 12.660 12.160 11.760 KIIvw 81 0
12 BPS CS 22892-0052 Pe* 22 17 01.6558480594 -16 39 27.051900047   14.03 13.20 13.06 12.19 KIIvw 410 0
13 HE 2356-0410 Pe* 23 59 13.1417869434 -03 53 48.220053208   14.39 13.60 13.164 12.713 CEMP-no 81 0

    Equat.    Gal    SGal    Ecl

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2020.07.15-07:31:51

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