2014A&A...571A..62C


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.23CEST19:30:13

2014A&A...571A..62C - Astronomy and Astrophysics, volume 571A, 62-62 (2014/11-1)

Chemical abundances of the metal-poor horizontal-branch stars BPS CS 22186-005.

CALISKAN S., CAFFAU E., BONIFACIO P., CHRISTLIEB N., MONACO L., BEERS T.C., ALBAYRAK B. and SBORDONE L.

Abstract (from CDS):

We report on a chemical-abundance analysis of two very metal-poor horizontal-branch stars in the Milky Way halo: CS 22186-005 ([Fe/H]=-2.70) and CS 30344-033 ([Fe/H]=-2.90). The analysis is based on high-resolution spectra obtained at ESO, with the spectrographs HARPS at the 3.6m telescope, and UVES at the VLT. We adopted one-dimensional, plane-parallel model atmospheres assuming local thermodynamic equilibrium. We derived elemental abundances for 13 elements for CS 22186-005 and 14 elements for CS 30344-033. This study is the first abundance analysis of CS 30344-033. CS 22186-005 has been analyzed previously, but we report here the first measurement of nickel (Ni; Z=28) for this star, based on twenty-two NiI lines ([Ni/Fe]=-0.21±0.02); the measurement is significantly below the mean found for most metal-poor stars. Differences of up to 0.5dex in [Ni/Fe] ratios were determined by different authors for the same type of stars in the literature, which means that it is not yet possible to conclude that there is a real intrinsic scatter in the [Ni/Fe] ratios. For the other elements for which we obtained estimates, the abundance patterns in these two stars match the Galactic trends defined by giant and turnoff stars well. This confirms the value of horizontal-branch stars as tracers of the chemical properties of stellar populations in the Galaxy. Our radial velocities measurements for CS 22186-005 differ from previously published measurements by more than the expected statistical errors. More measurements of the radial velocity of this star are encouraged to confirm or refute its radial velocity variability.

Abstract Copyright:

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

Simbad objects: 44

goto Full paper

goto View the reference in ADS

Number of rows : 44

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 HE 0027-3613 Pe* 00 30 15.9613306172 -35 56 51.230873749     14.74     ~ 28 0
2 HE 0049-3948 Pe* 00 52 13.3521809211 -39 32 36.982663936   15.70       ~ 12 0
3 BPS CS 29518-0043 * 01 18 38.3021781706 -30 41 02.851142792 14.730 14.94 14.57     ~ 24 0
4 BPS CS 22174-0020 Pe* 01 20 27.2775318208 -08 47 16.321191404   15.52 15.04 15.09   ~ 10 0
5 BPS CS 22953-0037 Pe* 01 25 06.6511385034 -59 16 00.741420364   14.01 13.64   13.13 CEMP-no 40 0
6 HE 0228-4047 * 02 30 33.6 -40 33 56   15.5       ~ 9 0
7 BPS CS 31061-0032 Pe* 02 38 43.3010009273 +03 19 02.564348687   14.30 13.90 13.581 13.290 ~ 26 0
8 G 4-36 PM* 02 43 22.0482584952 +13 25 56.980124495   11.989 11.471 11.133 10.795 ~ 59 0
9 HE 0411-5725 Pe* 04 12 05.1903531820 -57 17 59.420228819     15.79     ~ 5 0
10 HE 0409-1212 Pe* 04 12 13.8814170981 -12 05 05.075798490   13.843 12.897   11.764 ~ 60 0
11 HE 0411-3558 Pe* 04 13 09.0581512487 -35 50 38.817125702   13.33 12.96   12.352 ~ 22 0
12 HD 60778 HB* 07 36 11.7735389060 -00 08 15.571097984 9.34 9.20 9.10     A0III/IV 103 0
13 SDSS J082521.28+040334.3 * 08 25 21.2815880878 +04 03 34.438310648           ~ 7 0
14 HD 74721 HB* 08 45 59.2617958540 +13 15 48.592813847 8.88 8.75 8.72     A0V 138 0
15 HE 1012-1540 Pe* 10 14 53.4754858508 -15 55 53.171904692     14.04     CEMP-no 31 0
16 HD 93329 HB* 10 46 36.6445338103 +11 11 02.847652309 8.980 8.880 8.800     A0 45 0
17 SDSS J113528.08+010848.7 * 11 35 28.0819802186 +01 08 48.756293993           ~ 4 0
18 HE 1207-3108 * 12 09 54.1 -31 25 11   12.9       ~ 11 0
19 HE 1320+0139 Pe* 13 22 50.6003232115 +01 23 42.949469848   16.72 16.08 15.40   ~ 9 0
20 HE 1422-0818 Pe* 14 25 06.5325151445 -08 31 30.861144236     15.24     ~ 5 0
21 HE 1424-0241 Pe* 14 26 40.3306796622 -02 54 27.486631656   15.892 15.45 14.887 14.54 ~ 31 0
22 HE 1434-1442 Pe* 14 37 26.5892140416 -14 54 59.397681972     15.40   15.395 CEMP-s 15 0
23 HE 1506-0113 Pe* 15 09 14.2926751829 -01 24 56.730409770   15.4       CEMP-no 21 0
24 SDSS J154246.87+054426.4 * 15 42 46.8802250299 +05 44 26.458537684           ~ 4 0
25 BPS CS 22878-0121 HB* 16 47 50.0362549004 +11 39 11.349504431   14.53 13.99     ~ 9 0
26 BPS CS 22891-0200 Pe* 19 35 19.0776617459 -61 42 24.374411136   14.77 13.93   12.79 CEMP-no 36 0
27 HD 186478 Pe* 19 45 14.1410795461 -17 29 27.071420634   10.116 9.302 8.527 7.961 K2III 130 0
28 BPS CS 22964-0183 Pe* 20 01 12.7605230744 -40 49 09.898961969   14.91 14.45 14.140 13.751 CEMP-no 10 0
29 BPS CS 22943-0137 Pe* 20 26 29.0086712518 -43 00 42.661616093 14.670 15 14.47     ~ 16 0
30 BPS CS 22940-0070 RR* 20 42 39.2495160935 -61 40 39.106379545   15.35 14.87     ~ 11 0
31 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2918 0
32 BPS CS 22948-0006 HB* 21 33 17.7081427117 -39 39 42.814412221   15.56 15.07     ~ 10 0
33 BPS CS 22944-0039 HB* 21 45 12.2656952744 -14 41 24.825821936   14.85 14.30     ~ 8 0
34 HE 2142-5656 Pe* 21 46 20.50080 -56 42 18.0080   14.4       CEMP-no 11 0
35 BPS CS 22948-0093 Pe* 21 50 31.5179802313 -41 07 49.353957554   15.54 15.18     ~ 33 0
36 BPS CS 22951-0077 HB* 21 57 53.2095763865 -43 08 08.217922610   14.11 13.61   12.805 ~ 12 0
37 BPS CS 22886-0043 HB* 22 22 33.7872141628 -10 14 08.992820541   15.18 14.72   13.991 ~ 11 0
38 HE 2232-0603 Pe* 22 34 47.4283794688 -05 48 17.344893935   16.861 16.51 15.894 15.591 ~ 16 0
39 HE 2247-7400 Pe* 22 51 19.60360 -73 44 21.0051   14.4       CEMP-no 11 0
40 BPS CS 30344-0033 * 22 55 32.1833091000 -34 42 55.790809412   14.63 14.22 14.20   ~ 3 0
41 CD-24 17504 Pe* 23 07 20.2536159873 -23 52 35.956455668   12.51 12.18     CEMP-no 82 0
42 SDSS J230814.85-085526.3 * 23 08 14.8559859320 -08 55 26.363965059           ~ 6 0
43 SDSS J233113.45-010933.2 * 23 31 13.4522649784 -01 09 33.286425912           ~ 4 0
44 SB 966 Pe* 23 53 40.2977653893 -26 58 43.988331934   13.50 13.050     sdF/G? 35 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2014A&A...571A..62C and select 'bookmark this link' or equivalent in the popup menu


2020.09.23-19:30:13

© Université de Strasbourg/CNRS

    • Contact