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

Full paper

View the references in ADS

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 - 2023
1	HE 0007-1832	Pe*	00 09 52.7815684392	-18 16 12.275163984			15.46			CEMP-no	19
2	CD-38 245	Pe*	00 46 36.1954514592	-37 39 33.555030480		12.733	11.929	13.39	10.996	KIIvw	220
3	HE 0107-5240	Pe*	01 09 29.1555567432	-52 24 34.202039148		15.89	15.07	15.10	14.283	CEMP-no	239
4	HE 0212-0557	Pe*	02 15 02.5102061448	-05 43 23.655462024			14.70			CEMP-s	15
5	HE 0218-2738	Pe*	02 21 03.9311324592	-27 24 40.401469764	15.037	15.277	14.88			~	16
6	HE 0305-5442	Pe*	03 06 29.5014981984	-54 30 32.498486568		14.44	13.70	13.212	12.715	KIIvw	74
7	2MASS J03142084-1035112	Pe*	03 14 20.8495451808	-10 35 11.277788028		13.54	12.73	12.204	11.693	KIIvw	66
8	G 77-61	Pe*	03 32 38.0920129269	+01 58 00.084645962		15.60	13.90	12.9		dC-J_CH5	130
9	BPS BS 16545-0089	Pe*	11 24 27.5182636872	+36 50 28.816337760		14.76	14.44	14.039	13.812	~	20
10	BPS BS 16467-0062	Pe*	13 42 00.6326009568	+17 48 40.826539260		14.69	14.09	13.665	13.216	~	47
11	BPS CS 22885-0096	Pe*	20 20 51.1730095656	-39 53 30.234972840		14.02	13.33			CEMP-no	85
12	BPS CS 29498-0043	Pe*	21 03 52.1197651440	-29 42 50.344181712		14.8	13.72	13.013	12.406	CEMP-no	91
13	HE 2323-0256	Pe*	23 26 29.8073738880	-02 39 58.036383180		15.12	14.36		13.358	CEMP-no	177
14	HE 2356-0410	Pe*	23 59 13.1419841280	-03 53 48.220213560		14.39	13.60	13.164	12.713	CEMP-no	84

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