2004A&A...428..579A


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.22CEST00:25:43

2004A&A...428..579A - Astronomy and Astrophysics, volume 428, 579-586 (2004/12-3)

A low upper-limit on the lithium isotope ratio in HD 140283.

AOKI W., INOUE S., KAWANOMOTO S., RYAN S.G., SMITH I.M., SUZUKI T.K. and TAKADA-HIDAI M.

Abstract (from CDS):

We have obtained a high-S/N (900-1100), high-resolving-power (R=95000) spectrum of the metal-poor subgiant HD 140283 in an effort to measure its 6Li/7Li isotope ratio. From a 1-D atmospheric analysis, we find a value consistent with zero, 6Li/7Li=0.001, with an upper limit of 6Li/7Li<0.018. This measurement supersedes an earlier detection (0.040±0.015(1σ)) by one of the authors. HD 140283 provides no support for the suggestion that Population II stars may preserve their 6Li on the portion of the subgiant branch where 7Li is preserved. However, this star does not defeat the suggestion either; being at the cool end of the subgiant branch of the Spite plateau, it may be sufficiently cool that 6Li depletion has already set in, or the star may be sufficiently metal poor that little Galactic production of 6Li had occurred. Continued investigation of other subgiants is necessary to test the idea. We also consider the implications of the HD 140283 upper limit in conjunction with other measurements for models of 6Li production by cosmic rays from supernovae and structure formation shocks.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: Population II - Galaxy: halo - Galaxy: kinematics and dynamics - Galaxy: structure - nuclear reactions, nucleosynthesis, abundances

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 84937 PM* 09 48 56.09801 +13 44 39.3237 8.49 8.68 8.32 7.97 7.70 F8Vm-5 699 0
2 HD 140283 Pe* 15 43 03.0967798658 -10 56 00.595803430 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 839 0
3 HD 338529 PM* 19 32 31.9104538188 +26 23 26.116678290   9.72   9.2   B5 194 0

    Equat.    Gal    SGal    Ecl

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2019.07.22-00:25:43

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