2005A&A...434.1117P


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.30CEST19:13:03

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 - 2020
#notes
1 HE 0007-1832 Pe* 00 09 52.7814403998 -18 16 12.276852284     15.46     CEMP-no 19 0
2 CD-38 245 Pe* 00 46 36.1954714218 -37 39 33.555736375   12.733 11.929 13.39 10.996 KIIvw 203 0
3 HE 0107-5240 Pe* 01 09 29.1554552993 -52 24 34.203535506   15.89 15.07 15.10 14.283 CEMP-no 228 0
4 HE 0212-0557 Pe* 02 15 02.5101220196 -05 43 23.652630023     14.70     CEMP-s 15 0
5 HE 0218-2738 Pe* 02 21 03.9314569603 -27 24 40.404185585 15.037 15.277 14.88     ~ 16 0
6 HE 0305-5442 Pe* 03 06 29.5014936276 -54 30 32.498352902   14.44 13.70 13.212 12.715 KIIvw 73 0
7 HE 0311-1046 Pe* 03 14 20.8495240680 -10 35 11.279671787   13.54 12.73 12.204 11.693 KIIvw 64 0
8 G 77-61 Pe* 03 32 38.0871477505 +01 58 00.010460312   15.60 13.90 12.9   dC-J_CH5 124 0
9 BPS BS 16545-0089 Pe* 11 24 27.5182572222 +36 50 28.816930436   14.76 14.44 14.039 13.812 ~ 20 0
10 BPS BS 16467-0062 Pe* 13 42 00.6325668250 +17 48 40.825137829   14.69 14.09 13.665 13.216 ~ 46 0
11 BPS CS 22885-0096 Pe* 20 20 51.1729562140 -39 53 30.235406812   14.02 13.33     CEMP-no 82 0
12 BPS CS 29498-0043 Pe* 21 03 52.1197489072 -29 42 50.344264361   14.8 13.72 13.013 12.406 CEMP-no 87 0
13 HE 2323-0256 Pe* 23 26 29.8073543039 -02 39 58.037206596   15.12 14.36   13.358 CEMP-no 171 0
14 HE 2356-0410 Pe* 23 59 13.1417869434 -03 53 48.220053208   14.39 13.60 13.164 12.713 CEMP-no 81 0

    Equat.    Gal    SGal    Ecl

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2020.09.30-19:13:03

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