2006A&A...451..993C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.09CEST23:47:10

2006A&A...451..993C - Astronomy and Astrophysics, volume 451, 993-997 (2006/6-1)

S1242: a lithium-rich subgiant star in the open cluster M67.

CANTO MARTINS B.L., LEBRE A., DE LAVERNY P., MELO C.H.F., DO NASCIMENTO J.D.Jr, RICHARD O. and DE MEDEIROS J.R.

Abstract (from CDS):

We report the serendipitous discovery of a lithium-rich subgiant star, S1242. This object is member of a large eccentricity spectroscopic binary system in the solar-age open cluster M67. Using VLT/FLAMES-UVES observations and synthetic spectrum analysis, we derived for this star stellar parameters (temperature, gravity, metallicity and rotational velocity) and a surface Li abundance (ALi=2.7) larger than the higher abundance of M67 stars near the turn-off. The high Li abundance we found in S1242 points to an excess of lithium at the subgiant stage. We discuss two possible explanations for this unusually high Li content in this binary system: a preservation of the Li at the turn-off stage due to tidal effects, or an efficient dredge-up of Li, hidden below the convective zone by atomic diffusion occuring in the post turn-off stage.

Abstract Copyright:

Journal keyword(s): stars: binaries: general - stars: abundances - stars: fundamental parameters - stars: atmospheres - stars: evolution

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 - 2020
#notes
1 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2032 0
2 NGC 2682 119 RS* 08 51 19.0167426106 +11 50 05.757133353 13.197 13.13 12.547 12.177 11.837 F9IV 67 0
3 NGC 2682 195 SB* 08 51 36.0099994276 +11 46 33.605594679 13.539 13.4 12.682 12.328 11.915 G1V 43 0

    Equat.    Gal    SGal    Ecl

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2020.07.09-23:47:10

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