2007A&A...470.1033C


Query : 2007A&A...470.1033C

2007A&A...470.1033C - Astronomy and Astrophysics, volume 470, 1033-1041 (2007/8-2)

The isotopic 6Li/7Li ratio in Centaurus X-4 and the origin of Li in X-ray binaries.

CASARES J., BONIFACIO P., GONZALEZ HERNANDEZ J.I., MOLARO P. and ZOCCALI M.

Abstract (from CDS):

Cool stars, companions to compact objects, are known to show Li abundances which are high compared to field stars of the same spectral type, which are heavily Li depleted. This may be due either to Li production or Li preservation in these systems. Our aim is to measure the lithium isotopic ratio in the companion star of the neutron star X-ray binary Cen X-4. We use UVES spectra obtained in years 2000 and 2004 around the orbital quadratures. The spectra are analysed with spectrum synthesis techniques and the errors estimated with Monte Carlo simulations. We measure A(Li)=2.87±0.20 and 6Li/7Li=0.12+0.08–0.05 at 68% confidence level. We also present updated system parameters with a refined determination of the orbital period and component masses i.e. 1.14±0.45M and 0.23±0.10M for the neutron star and companion, respectively. In our view the low level of 6Li favours Li preservation scenarios, although Li production mechanisms cannot be ruled out. In the case of preservation, no Li is freshly created in the binary, but the tidally-locked companion has preserved its original Li by some mechanism, possibly inhibited destruction due to its fast rotation.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: binaries: close - stars: individual: Cen X-4 (=V822 Cen) - X-rays: binaries

Simbad objects: 8

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Number of rows : 8
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 V* V518 Per HXB 04 21 42.7227473352 +32 54 26.939156184 13.00 13.50 13.2     M4.5V 635 1
2 1A 0620-00 HXB 06 22 44.5423857312 -00 20 44.290460544 10.60 11.40 11.2     K3V-K7V 1068 0
3 V* KV UMa HXB 11 18 10.7930420496 +48 02 12.314730120     12.25     K5V-M1V 760 0
4 V* GU Mus HXB 11 26 26.5961559600 -68 40 32.877752952           K3V-K7V 687 1
5 V* V822 Cen LXB 14 58 21.9347842080 -31 40 07.515432768 11.95 12.85 12.8     K3-K7V 528 0
6 V* V2107 Oph HXB 17 08 14.520 -25 05 30.15   16.50 15.9     K3V-K7V 214 1
7 V* QZ Vul HXB 20 02 49.58 +25 14 11.3   19.64 18.2     K3V-K6V 405 0
8 V* V404 Cyg HXB 20 24 03.8254458776 +33 52 01.962185735           G9/K0III/V 1174 0

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2022.05.27-08:23:31

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