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

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

2005A&A...439..227M - Astronomy and Astrophysics, volume 439227-235 (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

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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 - 2026 		#notes
1 HD 360 HB* 00 08 17.5324307736 -08 49 26.801843988   7.014 5.980     K1II 57 0
2 HD 787 PM* 00 12 09.9845643792 -17 56 17.702925108   6.740 5.265     K4III 105 0
3 * iot Cet * 00 19 25.6743948847 -08 49 26.108975369 5.94 4.77 3.55 2.70 2.11 K1+IIICN0.5 190 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-1 543 1
5 * phi03 Cet * 00 56 01.4895888936 -11 15 59.493762540   6.852 5.326     K5III 50 0
6 V* OP And RG* 01 36 27.2005869192 +48 43 22.000439676   7.47 6.22     K1III: 110 0
7 HD 19745 AB? 03 07 03.2479728720 -65 26 56.811398748   10.16 9.10     K1III 48 0
8 HD 30238 * 04 45 04.1610341832 -21 17 00.174536412   7.168 5.692     K4III 30 0
9 HD 39853 RG* 05 54 43.6305696648 -11 46 27.098071500   7.148 5.613     K4III 127 0
10 * 140 Pup * 07 40 23.2104428256 -15 15 50.110710444   6.503 4.951     K3III 63 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-0.5 214 0
12 HD 82943 PM* 09 34 50.7353072232 -12 07 46.369202196   7.17 6.53     F9VFe+0.5 498 2
13 * alf Crt PM* 10 59 46.4651557828 -18 17 55.630394216 6.14 5.16 4.07 3.27 2.72 K0IIIb 224 0
14 HD 95799 * 11 02 25.1094103728 -58 45 37.378955412   8.960 7.978 7.395 6.906 G8III 40 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 158 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 169 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 2417 1
18 HD 126271 PM* 14 24 18.2683316280 +08 05 04.553140092       5.4   K4III 62 0
19 HD 148650 * 16 35 49.3420078032 -71 53 39.303547512   6.53 6.51     A0V 14 0
20 HD 176588 * 19 01 09.5030760528 -04 26 20.285770560   8.57 6.88     K4/5III 29 0
21 HD 183492 RG* 19 29 22.1540342928 +14 35 45.669109020   6.618 5.564     K0III 68 0
22 V* DI Psc RG* 22 59 59.3874643920 +05 09 34.477650828   8.32 7.16     K0III/IV 37 0
23 V* BI Ind RS* 23 13 52.7842528944 -68 17 28.814107128   8.89 7.67     K2IIIp 50 0
24 * b01 Aqr PM* 23 22 58.2258307196 -20 06 02.095519871 6.03 5.08 3.98 3.16 2.56 K1III 101 0

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