2006A&A...454..895A


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST15:36:36

2006A&A...454..895A - Astronomy and Astrophysics, volume 454, 895-915 (2006/8-2)

Analysis of 26 barium stars. I. Abundances.

ALLEN D.M. and BARBUY B.

Abstract (from CDS):

We present a detailed analysis of 26 barium stars, including dwarf barium stars, providing their atmospheric parameters (Teff, logg, [Fe/H], vt), and elemental abundances. We aim at deriving gravities and luminosity classes of the sample stars, in particular to confirm the existence of dwarf barium stars. Accurate abundances of chemical elements were derived. We present the abundance ratios between nucleosynthetic processes, by using Eu and Ba as representatives of the r- and s-processes. High-resolution spectra were obtained with the FEROS spectrograph at the ESO-1.52m Telescope, along with photometric data with Fotrap at the Zeiss telescope at the LNA. The atmospheric parameters were derived in an iterative way, with temperatures obtained from colour-temperature calibrations. The abundances were derived using spectrum synthesis for Li, Na, Al, α-, iron-peak, s-, and r-element atomic lines, and for C and N molecular lines. Atmospheric parameters in the range 4300<Teff<6500, -1.2<[Fe/H]<0.0, and 1.4≤logg<4.6 were derived, confirming that our sample contains giants, subgiants, and dwarfs. The abundance results obtained for Li, Al, Na, α-, and iron-peak elements for the sample stars show that they are compatible with the values found in the literature for normal disk stars in the same range of metallicities. Enhancements of C, N, and heavy elements relative to Fe, that characterise barium stars, were derived and showed that [X/Ba] vs. [Ba/H] and [X/Ba] vs. [Fe/H] present different behaviour as compared to [X/Eu] vs. [Eu/H] and [X/Eu] vs. [Fe/H], reflecting the different nucleosynthetic sites for the s- and r-processes.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/454/895): stars.dat table5.dat table15.dat>

Simbad objects: 31

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Number of rows : 31

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 HD 749 PM* 00 11 38.0949181329 -49 39 21.729950461   9.03 7.88     K0pBa 34 0
2 HD 2454 PM* 00 28 20.0441170647 +10 11 23.308682092   6.47   5.8   F5VSr 163 0
3 HD 5424 SB* 00 55 43.9269897905 -27 53 37.267085541   10.558 9.517 9.690   G8II 45 1
4 HD 8270 Pe* 01 21 09.9840484336 -47 31 51.727592766   9.34 8.82     F8IV 25 0
5 HD 12392 * 02 01 22.7641698509 -04 48 11.767132553   9.56 8.48     G8II 16 0
6 HD 13551 Pe* 02 10 08.2931328892 -60 45 29.341963274   9.86 9.30     F7wF3 31 0
7 * ksi01 Cet EB* 02 12 59.9976927035 +08 50 48.202315944 5.86 5.23 4.35 3.68 3.18 G7IIIBa0.4Fe-1 205 1
8 HD 22589 SB* 03 37 55.2476467353 -06 58 28.329379028   9.72 9.00     G5II 24 0
9 V* V1092 Tau BY* 03 57 05.8140352553 +28 37 51.617277354   12.61 11.51 10.92   K2V+DA1.5 45 0
10 HD 27271 SB* 04 18 33.8263595544 +02 28 13.914564523   8.53 7.52     G8II 47 0
11 HD 48565 SB* 06 44 54.9136936802 +20 51 38.350227797   7.746 7.183     hF8gF8mF3 64 0
12 HD 76225 ** 08 54 00.8616289930 -26 54 56.385901380   9.73 9.20     F7/G+A(pSr) 32 0
13 HD 87080 SB* 10 02 00.8598789132 -33 41 06.508653916   10.15 9.37     G6III_Ba5.5_CH 45 0
14 HD 89948 SB* 10 22 21.8602764847 -29 33 21.560135988 8.12 8.11 7.55     G2IIIBa1 70 0
15 HD 92545 Pe* 10 40 57.7072314402 -12 11 44.223424837   9.07 9.149 8.25 9.047 F7IV 39 0
16 HD 106191 SB* 12 13 11.3755973322 -15 13 56.425254721   10.73 10.08     F8/G1V 24 0
17 HD 107574 SB* 12 21 51.8580902959 -18 24 00.255862910   8.99 8.54     F3IV/V 45 0
18 PN A66 35 PN 12 53 32.7840615552 -22 52 22.614854036   10.52 9.69     G8III-IV+DAO 179 1
19 PN LoTr 5 PN 12 55 33.7461986779 +25 53 30.561300806   9.72 8.88     G5III-IV 195 0
20 HD 116869 Pe* 13 26 37.9602151552 -04 26 44.933514767   10.47 9.50     G8III:Fe-0.5CH1Ba1 22 0
21 HD 123585 SB* 14 09 35.7952107527 -44 22 01.195989267   9.75 9.23     G0III_Ba3_CH 56 0
22 HD 123396 Pe* 14 17 31.5591919267 -83 32 52.136247808   10.14 8.96     G8/K0II/IIIp 31 0
23 HD 147609 SB* 16 21 51.9861832532 +27 22 27.191800307   9.69 9.18     G5 24 0
24 HD 150862 ** 16 44 44.0888580876 -25 12 59.338279935   9.72 9.19     F7V+A(pSr) 27 0
25 HD 188985 Pe* 19 59 58.2969528328 -48 58 31.180568493   9.07 8.56     G2III_Ba1 41 0
26 * zet Cap SB* 21 26 40.0263390 -22 24 40.804197 5.35 4.75 3.74 3.09 2.65 G4Ib:Ba2 266 1
27 HD 210709 Pe* 22 12 53.8133886718 -35 25 50.993928886   10.29 9.23     G8II/III 24 0
28 HD 210910 * 22 13 42.2192665496 -03 46 32.860771560   9.57 8.49     G8III 14 0
29 HD 222349 PM* 23 40 00.9452477085 -56 44 26.199316436   9.70 9.22     G5/K0+A/F(Sr) 31 0
30 BD+18 5215 SB* 23 46 56.0386405439 +19 28 22.131367910   10.18 9.68     F/Gp 22 0
31 HD 223938 Pe* 23 53 49.8958215728 -49 59 57.975704922   9.51 8.60     G6pBa 20 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-15:36:36

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