2000A&A...360.1077S


Query : 2000A&A...360.1077S

2000A&A...360.1077S - Astronomy and Astrophysics, volume 360, 1077-1085 (2000/8-3)

Element abundance ratios in an extremely metal-poor binary star: CS 22873-139.

SPITE M., DEPAGNE E., NORDSTROEM B., HILL V., CAYREL R., SPITE F. and BEERS T.C.

Abstract (from CDS):

High-resolution spectra of the extremely metal-poor double-lined spectroscopic binary star BPS CS 22873-139 have been analyzed to determine the metallicity and abundance ratios for a number of elements. From the analysis of the collected radial velocities, new orbital elements are derived as well as an improved mass ratio. In spite of its extreme metal deficiency, [Fe/H]=-3.4, the abundance ratios of CS 22873-139 are not similar to those of a typical Population II star. In particular, the α-elements are not enhanced relative to iron, and the strontium abundance is very low. The abundance pattern of CS 22873-139 is compared to the patterns exhibited by other metal-poor stars which exhibit also very low strontium abundances. There is a large spread of elemental abundance ratios among these stars, suggesting that low strontium abundance may be associated with a variety of nucleosynthesis histories. The abundance ratios of CS 22873-139 are, surprisingly, very similar to those found in a common proper-motion pair HD 134439, HD 134440, even though the metallicity of this system is almost two dex higher, [Fe/H]=-1.7. The ratios are compared to those of another very metal-poor binary star BPS CS 22876-032. The unusual abundance pattern of CS 22873-139 is discussed (by comparison to the predicted yields of zero-metal SN II and hypernovae). The lithium doublet at 6707Å is not detected in CS 22873-139, but an abundance of lithium consistent with the Spite plateau cannot be excluded, based on the present data.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: binaries: spectroscopic - stars: PopulationII - stars: individual: BPS CS 22873-139 - nuclear reactions, nucleosynthesis, abundances

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 SB 44 SB* 00 07 37.5160264968 -35 31 17.704959708   13.23 12.76 12.76   sdF 79 0
2 LP 831-70 PM* 03 06 05.4386096664 -22 19 17.828964660   11.97 11.80     ~ 47 0
3 HE 0305-5442 Pe* 03 06 29.5014981984 -54 30 32.498486568   14.44 13.70 13.212 12.715 KIIvw 74 0
4 HE 0311-1046 Pe* 03 14 20.8495451808 -10 35 11.277788028   13.54 12.73 12.204 11.693 KIIvw 64 0
5 HD 134440 PM* 15 10 12.9678589986 -16 27 46.522175847 10.69 10.217 9.426 8.913 8.441 K2V 272 0
6 HD 134439 PM* 15 10 13.0873110544 -16 22 45.877317625 10.03 9.837 9.066 8.604 8.160 sd:K1Fe-1 316 0
7 BPS CS 22891-0200 Pe* 19 35 19.0776472464 -61 42 24.374080224   14.77 13.93   12.79 CEMP-no 39 0
8 BPS CS 22873-0139 SB* 20 05 55.1466054456 -59 17 11.461854084       13.810   ~ 33 0
9 BPS CS 22885-0096 Pe* 20 20 51.1730095656 -39 53 30.234972840   14.02 13.33     CEMP-no 83 0
10 BPS CS 22943-0137 Pe* 20 26 29.0087260776 -43 00 42.661173708 14.670 15 14.47     ~ 17 0
11 BPS CS 22949-0048 Pe* 23 26 07.4169241824 -05 50 06.903492036   14.48 13.67 13.154 12.639 CEMP-no 31 0

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2022.05.20-19:53:06

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