2015ApJ...810L..27F


Query : 2015ApJ...810L..27F

2015ApJ...810L..27F - Astrophys. J., 810, L27 (2015/September-2)

SD 1313-0019: another second-generation star with [Fe/H] = -5.0, observed with the Magellan telescope.

FREBEL A., CHITI A., JI A.P., JACOBSON H.R. and PLACCO V.M.

Abstract (from CDS):

We present a Magellan/MIKE high-resolution (R ∼ 35,000) spectrum of the ancient star SD 1313-0019, which has an iron abundance of [Fe/H] = -5.0, paired with a carbon enhancement of [C/Fe] ∼ 3.0. The star was initially identified by Allende Prieto et al. in the BOSS survey. Its medium-resolution spectrum suggested a higher metallicity of [Fe/H] = -4.3 due to the Ca ii K line blending with a CH feature, which is a common issue related to the search for the most iron-poor stars. This star joins several other similar stars with [Fe/H] ≲ -5.0 that all display a combination of low-iron and high-carbon abundances. Other elemental abundances of SD 1313-0019 follow that of more metal-rich halo stars. Fitting the abundance pattern with yields of Population III supernovae suggests that SD 1313-0019 had only one massive progenitor star with 20 - 30M that must have undergone a mixing and fallback episode. Overall, there are now five stars known with [Fe/H] ≲ -5.0 (1D local thermodynamic equilibrium abundances). This ever-increasing population of carbon-rich, iron-deficient stars can potentially constrain nucleosynthesis in Population III stars and their supernova explosions, the formation mechanisms of the first low-mass stars, and the nature of the first galaxies.

Abstract Copyright:

Journal keyword(s): early universe - Galaxy: halo - stars: abundances - stars: individual: SD 1313-0019 - stars: Population II

Simbad objects: 9

goto Full paper

goto View the references in ADS

Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 CD-38 245 Pe* 00 46 36.1954514592 -37 39 33.555030480   12.733 11.929 13.39 10.996 KIIvw 215 0
2 HE 0107-5240 Pe* 01 09 29.1555567432 -52 24 34.202039148   15.89 15.07 15.10 14.283 CEMP-no 236 0
3 UCAC4 115-002803 Pe* 03 13 00.3747928560 -67 08 39.336144504   15.442 14.753 14.639   CEMP-no 100 0
4 HE 0557-4840 Pe* 05 58 39.2660594064 -48 39 56.890252404   16.16 15.45 14.991   CEMP-no 84 0
5 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 417 1
6 HE 1300+0157 Pe* 13 02 56.2443901392 +01 41 52.080457056   14.536 14.11 13.678 13.261 CEMP-no 41 0
7 2MASS J13132688-0019415 Pe* 13 13 26.8884339336 -00 19 41.336280264           CEMP-no 27 0
8 HE 1327-2326 Pe* 13 30 05.9394958608 -23 41 49.699340844 13.761 14.01 13.55 13.50 12.803 CEMP-no 232 0
9 Wolf 1492 Pe* 13 40 02.4921849768 -00 02 18.750053436 11.601 11.832 11.451 11.184 10.892 sdF0: 274 0

To bookmark this query, right click on this link: simbad:objects in 2015ApJ...810L..27F and select 'bookmark this link' or equivalent in the popup menu


2023.02.06-08:49:50

© Université de Strasbourg/CNRS

    • Contact