2005A&A...434.1117P

Query : 2005A&A...434.1117P

2005A&A...434.1117P - Astronomy and Astrophysics, volume 434, 1117-1124 (2005/5-2)

Analysis of the carbon-rich very metal-poor dwarf G77-61.

PLEZ B. and COHEN J.G.

Abstract (from CDS):

We present an analysis of the carbon dwarf G77-61, a known binary, based on high resolution Keck spectra. G77-61 has a very-low metallicity, although not as extreme as what was previously conjectured. This star is very carbon-enhanced, the spectra showing very strong CH, CN, and C2 bands of both 13C and 12C isotopes. Atomic lines are sparse, and often blended, but we were able to derive abundances for Na, Mg, Ca, Cr, Mn, and Fe. Its [Fe/H] of -4.03±0.1 places it among the lowest metallicity stars known, and its very high [C/Fe]=+2.6 , and [N/Fe]=+2.6 among the most C and N-rich metal-poor stars. The carbon isotopic ratio is 12C/13C=5±1. No overabundance of s- or r-process elements is detectable, but the upper limits that can be set on these overabundances are not very constraining.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: carbon - stars: Population II - stars: individual: G77-61

CDS comments: p.1121 CS 22162-002 is a probable misprint for BPS CS 22172-002

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 HE 0007-1832 Pe* 00 09 52.7815684392 -18 16 12.275163984     15.46     CEMP-no 19 0
2 CD-38 245 Pe* 00 46 36.1954514592 -37 39 33.555030480   12.733 11.929 13.39 10.996 KIIvw 224 0
3 HE 0107-5240 Pe* 01 09 29.1555567432 -52 24 34.202039148   15.89 15.07 15.10 14.283 CEMP-no 244 0
4 HE 0212-0557 Pe* 02 15 02.5102061448 -05 43 23.655462024     14.70     CEMP-s 15 0
5 HE 0218-2738 Pe* 02 21 03.9311324592 -27 24 40.401469764 15.037 15.277 14.88     ~ 17 0
6 HE 0305-5442 Pe* 03 06 29.5014981984 -54 30 32.498486568   14.44 13.70 13.212 12.715 KIIvw 74 0
7 2MASS J03142084-1035112 Pe* 03 14 20.8495451808 -10 35 11.277788028   13.54 12.73 12.204 11.693 KIIvw 67 0
8 G 77-61 Pe* 03 32 38.0920129269 +01 58 00.084645962   15.60 13.90 12.9   dC-J_CH5 132 0
9 BPS BS 16545-0089 Pe* 11 24 27.5182636872 +36 50 28.816337760   14.76 14.44 14.039 13.812 ~ 20 0
10 BPS BS 16467-0062 Pe* 13 42 00.6326009568 +17 48 40.826539260   14.69 14.09 13.665 13.216 ~ 47 0
11 BPS CS 22885-0096 Pe* 20 20 51.1730095656 -39 53 30.234972840   14.02 13.33     CEMP-no 88 0
12 BPS CS 29498-0043 Pe* 21 03 52.1197651440 -29 42 50.344181712   14.8 13.72 13.013 12.406 CEMP-no 93 0
13 HE 2323-0256 Pe* 23 26 29.8073738880 -02 39 58.036383180   15.12 14.36   13.358 CEMP-no 180 0
14 HE 2356-0410 Pe* 23 59 13.1419841280 -03 53 48.220213560   14.39 13.60 13.164 12.713 CEMP-no 85 0

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