2005A&A...439..227M

Query : 2005A&A...439..227M

2005A&A...439..227M - Astronomy and Astrophysics, volume 439, 227-235 (2005/8-3)

On the nature of lithium-rich giant stars. Constraints from beryllium abundances.

MELO C.H.F., DE LAVERNY P., SANTOS N.C., ISRAELIAN G., RANDICH S., DO NASCIMENTO J.D.Jr and DE MEDEIROS J.R.

Abstract (from CDS):

We have derived beryllium abundances for 7 Li-rich giant (A(Li)>1.5) stars and 10 other Li-normal giants with the aim of investigating the origin of the lithium in the Li-rich giants. In particular, we test the predictions of the engulfment scenario proposed by Siess & Livio (1999MNRAS.308.1133S), where the engulfment of a brown dwarf or one or more giant planets would lead to simultaneous enrichment of 7Li and 9Be. We show that regardless of their nature, none of the stars studied in this paper were found to have detectable beryllium. Using simple dilution arguments we show that engulfment of an external object as the sole source of Li enrichment is ruled out by the Li and Be abundance data. The present results favor the idea that Li has been produced in the interior of the stars by a Cameron-Fowler process and brought up to the surface by an extra mixing mechanism.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: interiors - stars: late-type

CDS comments: In Fig.4 HD 126217 is a probable misprint for HD 126271.

Simbad objects: 24

goto Full paper

goto View the references in ADS

Number of rows : 24
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 HD 360 HB* 00 08 17.5324307736 -08 49 26.801843988   7.014 5.980     K1II 46 0
2 HD 787 PM* 00 12 09.9845643792 -17 56 17.702925108   6.740 5.265     K4III 94 0
3 * iot Cet * 00 19 25.6743948847 -08 49 26.108975369 5.94 4.77 3.55 2.70 2.11 K1+IIICN0.5 180 0
4 * bet Cet PM* 00 43 35.37090 -17 59 11.7827 3.90 3.02 2.01 1.29 0.78 G9.5IIICH-1 525 1
5 * phi03 Cet * 00 56 01.4895888936 -11 15 59.493762540   6.852 5.326     K5III 46 0
6 V* OP And RS* 01 36 27.2005869192 +48 43 22.000439676   7.47 6.22     K1III: 101 0
7 HD 19745 AB? 03 07 03.2479728720 -65 26 56.811398748   10.16 9.10     K1III 38 0
8 HD 30238 * 04 45 04.1610341832 -21 17 00.174536412   7.168 5.692     K4III 26 0
9 HD 39853 RG* 05 54 43.6305696648 -11 46 27.098071500   7.148 5.613     K4III 116 0
10 * 140 Pup * 07 40 23.2104428256 -15 15 50.110710444   6.503 4.951     K3III 55 0
11 * alf Mon PM* 07 41 14.8319734511 -09 33 04.077766984 5.83 4.95 3.93 3.16 2.64 G9.5III-IIIbFe-0.5 201 0
12 HD 82943 PM* 09 34 50.7353072232 -12 07 46.369202196   7.17 6.53     F9VFe+0.5 470 2
13 * alf Crt PM* 10 59 46.4651557828 -18 17 55.630394216 6.14 5.16 4.07 3.27 2.72 K0IIIb 215 0
14 HD 95799 * 11 02 25.1094103728 -58 45 37.378955412   8.960 7.978 7.395 6.906 G8III 34 0
15 * eps Crv PM* 12 10 07.4805825 -22 37 11.161983 5.79 4.32 2.98 2.05 1.41 K2+IIIa 146 0
16 HD 112127 C* 12 53 55.7452187592 +26 46 47.982961020 9.56 8.14 6.88 5.97 5.39 C-R4IIIb 153 0
17 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2318 1
18 HD 126271 PM* 14 24 18.2683316280 +08 05 04.553140092       5.4   K4III 57 0
19 HD 148650 * 16 35 49.3420078032 -71 53 39.303547512   6.53 6.51     A0V 13 0
20 HD 176588 * 19 01 09.5030760528 -04 26 20.285770560   8.57 6.88     K4/5III 27 0
21 HD 183492 PM* 19 29 22.1540342928 +14 35 45.669109020   6.618 5.564     K0III 63 0
22 V* DI Psc LP? 22 59 59.3874643920 +05 09 34.477650828   8.32 7.16     K0III/IV 34 0
23 V* BI Ind RS* 23 13 52.7842528944 -68 17 28.814107128   8.89 7.67     K2IIIp 43 0
24 * b01 Aqr PM* 23 22 58.2258307196 -20 06 02.095519871 6.03 5.08 3.98 3.16 2.56 K1III 96 0

To bookmark this query, right click on this link: simbad:objects in 2005A&A...439..227M and select 'bookmark this link' or equivalent in the popup menu