1998A&A...336..915C


Query : 1998A&A...336..915C

1998A&A...336..915C - Astronomy and Astrophysics, volume 336, 915-919 (1998/8-3)

How many low-mass stars do destroy 3He?

CHARBONNEL C. and DO NASCIMENTO J.D.Jr

Abstract (from CDS):

We recall the current status of the long-standing 3He problem, and its possible connection with chemical anomalies on the red giant branch. In this context, we collect in the literature all the available observations of the carbon isotopic ratio in field and cluster giant stars. Using the HIPPARCOS parallaxes, we get constraints on the evolutionary status of the field stars of the sample. This allows us to identify the stars that have passed the luminosity function bump and present 12C/13C in disagreement with the standard predictions of stellar evolutionary models. We determine statistically what fraction of low mass stars experience an extra-mixing process on the red giant branch, and are then expected to destroy their 3He at this evolutionary phase. The high number we get satisfies the galactic requirements for the evolution of the 3He abundance.

Abstract Copyright:

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: interiors - stars: rotation

Simbad objects: 16

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Number of rows : 16
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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3722 0
2 NGC 752 OpC 01 56 54 +37 47.6           ~ 584 0
3 NGC 2360 OpC 07 17 46 -15 37.9           ~ 178 0
4 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2173 0
5 NGC 3242 PN 10 24 46.1335521792 -18 38 32.296857792   11.83 12.15     ~ 811 1
6 * alf UMa SB* 11 03 43.67152 +61 45 03.7249 3.78 2.86 1.79 0.98 0.40 G9III+A7.5 431 0
7 * 37 Com RS* 13 00 16.4694383232 +30 47 06.079456932   6.02 4.88     G9IIICH-2CN-1 153 0
8 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3229 0
9 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1757 0
10 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2099 0
11 NGC 6656 8 * 18 36 20.7248449800 -23 55 27.261792552   12.463 10.885 10.480   G2 18 0
12 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1295 0
13 IC 4756 OpC 18 38 31.2 +05 29 24           ~ 214 0
14 M 57 PN 18 53 35.0967659112 +33 01 44.883287544   15.405 15.769 15.901 16.062 DA(O?) 814 2
15 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1894 0
16 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1072 0

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2022.05.22-22:58:37

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