2004A&A...413.1073S


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.17CEST13:35:11

2004A&A...413.1073S - Astronomy and Astrophysics, volume 413, 1073-1085 (2004/1-3)

First stars. IV. CS 29497-030: Evidence for operation of the s-process at very low metallicity.

SIVARANI T., BONIFACIO P., MOLARO P., CAYREL R., SPITE M., SPITE F., PLEZ B., ANDERSEN J., BARBUY B., BEERS T.C., DEPAGNE E., HILL V., FRANCOIS P., NORDSTROEM B. and PRIMAS F.

Abstract (from CDS):

We present an abundance analysis of the very metal-poor, carbon-enhanced star CS 29497-030. Our results indicate that this unusually hot turnoff star (Teff=6650K, logg=3.5) has a metallicity [Fe/H]=-2.8, and exhibits large overabundances of carbon ([C/Fe]=+2.38), nitrogen ([N/Fe]=+1.88), and oxygen ([O/Fe]=+1.67). This star also exhibits a large enhancement in its neutron-capture elements; the pattern follows that expected to arise from the s-process. In particular, the Pb abundance is found to be very high with respect to iron ([Pb/Fe]=+3.5), and also with respect to the second peak s-process elements (e.g., Ba, La, Ce, Nd), which fits into the newly introduced classification of lead (Pb) stars. The known spectroscopic binary status of this star, along with the observed s-process abundance pattern, suggest that it has accreted matter from a companion, which formerly was an Asymptotic Giant-Branch (AGB) star. In a preliminary analysis, we have also identified broad absorption lines of metallic species that suggest a large axial rotational velocity for this star, which may be the result of spin-up associated with the accretion of material from its previous AGB companion. In addition, this star is clearly depleted in the light element Li. When considered along with its rather high inferred temperature, these observations are consistent with the expected properties of a very low metallicity halo blue straggler.

Abstract Copyright:

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: binary: spectroscopic - stars: individual: CS 29497-030 - Galaxy: halo - Galaxy: abundances

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 - 2019
#notes
1 HD 224959 Pe* 00 02 08.0224361239 -02 49 12.239963584   10.6 9.55     C1,1_CH4 83 0
2 HD 26 Pe* 00 05 22.2077761394 +08 47 16.096990670 9.80 9.29 8.25 7.49 7.03 C-H1.5 160 0
3 HE 0024-2523 Pe* 00 27 27.6485410349 -25 06 28.291081599 15.067 15.32 14.91     CEMP-s 65 0
4 BPS CS 31062-0050 Pe* 00 30 31.0633474070 -12 05 10.873150611   13.7 13.05 12.681 12.309 CEMP-r/s 58 0
5 HD 2665 PM* 00 30 45.4467882867 +57 03 53.626973228 8.66 8.51 7.72     G5IIIw 164 0
6 CD-24 266 BS* 00 40 47.9313778053 -24 07 34.183052519   12.955 12.656 12.441 12.216 CEMP-s 87 0
7 SB 960 Pe* 00 44 03.5698517387 -13 55 26.270588506   12.69 12.15 11.806 11.483 CEMP-s 100 0
8 CD-26 304 Pe* 00 57 18.1376089543 -25 26 09.699477820   13.57 12.69 12.198 11.759 CEMP-s 61 1
9 HE 0058-0244 Pe* 01 00 53.0236506123 -02 28 19.948243997   14.42 13.73 13.331 12.942 CEMP-r/s 33 0
10 BPS CS 31082-0001 Pe* 01 29 31.1311330115 -16 00 45.496485322 12.527 12.427 11.642 11.189 10.713 ~ 236 0
11 V* V Ari Pe* 02 15 00.0771486824 +12 14 23.613348802   10.8 9.80     C-H3.5 99 0
12 BPS CS 29526-0110 Pe* 03 27 43.6395462631 -23 00 29.931204041   13.71 13.35 13.116 12.834 CEMP-r/s 45 0
13 HD 21581 Pe* 03 28 54.4846692612 -00 25 03.106157430 9.75 9.54 8.71     G8w 115 0
14 HD 23439A EB* 03 47 02.1134213149 +41 25 38.104505984   8.89 8.12 7.7   K2:V_Fe-1.3 214 0
15 HD 115444 PM* 13 16 42.4591800169 +36 22 52.695481224   9.77 8.97 8.3 7.88 G9V 220 0
16 HD 126238 Pe* 14 25 29.9570911985 -43 38 36.947126248   8.44 7.68 7.44   G3/8wF0/2 99 1
17 BPS CS 30301-0015 Pe* 15 08 56.8433023195 +02 30 18.628172611   14.04 13.04   12.063 CEMP-s 42 0
18 LP 625-44 Pe* 16 43 14.0364804654 -01 55 30.408914037   12.84 11.68     CEMP-s 98 0
19 BD+23 3130 Pe* 17 32 41.6248195623 +23 44 11.624030553       8.6   G0III 116 0
20 HD 187861 Pe* 19 56 26.9429735087 -65 22 08.017100343   10.42 9.18     C1,1p_CH 52 0
21 HD 189711 Pe* 20 01 03.7891766338 +09 30 51.154617612 12.71 10.43 8.37 7.02 5.96 C4,3_CH3:_Ba5 65 0
22 HD 196944 Pe* 20 40 46.0790261041 -06 47 50.650812411   9.01 8.40 8.08   CEMP-s 84 0
23 BPS CS 22880-0074 Pe* 20 46 03.2162078511 -20 59 14.111093923   13.84 13.27 12.770 12.382 CEMP-s 44 0
24 HD 198269 Pe* 20 48 36.7373846084 +17 50 23.700525129   9.41 8.12     C-H3IV: 76 0
25 BPS CS 29498-0043 Pe* 21 03 52.1197489072 -29 42 50.344264361   14.8 13.72 13.013 12.406 CEMP-no 84 0
26 BPS CS 22898-0027 Pe* 21 05 45.0995574992 -18 36 57.505496795   13.26 12.76 12.476 12.094 CEMP-r/s 78 0
27 HD 201626 Pe* 21 09 59.2669493692 +26 36 55.010503706 9.73 9.26 8.16 7.34 6.82 C-H2IV: 138 0
28 HD 201891 PM* 21 11 59.0322335571 +17 43 39.888647667 7.74 7.88 7.37 6.91 6.59 G5V_Fe-2.5 363 0
29 HE 2148-1247 Pe* 21 51 17.9099257554 -12 33 41.560711332   15.2 14.79     CEMP-r/s 42 0
30 BPS CS 22892-0052 Pe* 22 17 01.6558480594 -16 39 27.051900047   14.03 13.20 13.06 12.19 KIIvw 399 0
31 HE 2323-0256 Pe* 23 26 29.8073543039 -02 39 58.037206596   15.12 14.36   13.358 CEMP-no 165 0

    Equat.    Gal    SGal    Ecl

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2019.08.17-13:35:11

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