Chemical abundances on the secondary star in the low-mass x-ray binary Cygnus X-2

L. Suárez-Andrés; J.I. González Hernández; G. Israelian; J. Casares; R. Rebolo

doi:10.1051/eas/1364035

All issues

Volume 64 (2013)

EAS Publications Series, 64 (2013) 253-256

Abstract

Issue		EAS Publications Series Volume 64, 2013 Setting a New Standard in the Analysis of Binary Stars


Page(s)		253 - 256
Section		Advances in Spectroscopic Methods
DOI		https://doi.org/10.1051/eas/1364035
Published online		25 February 2014

Setting a New Standard in the Analysis of Binary Stars
K. Pavlovski, A. Tkachenko and G. Torres (eds)
EAS Publications Series, 64 (2013) 253–256

Chemical abundances on the secondary star in the low-mass x-ray binary Cygnus X-2

L. Suárez-Andrés¹^,2, J.I. González Hernández¹^,2, G. Israelian¹^,2, J. Casares¹^,2 and R. Rebolo¹^,2^,3

¹ Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain
² Depto. Astrofísica, Universidad de La Laguna (ULL), 38206 La Laguna, Tenerife, Spain
³ Consejo Superior de Investigaciones Científicas, Spain

Abstract

We present our first results in the analysis of the secondary star in the Low-Mass X-Ray binary (LMXB) Cygnus X-2, using a high resolution spectrum obtained with UES@WHT in ORM (La Palma, Tenerife). We have used a χ2 minimization procedure to create a grid of 1 500 000 LTE synthetic spectra that allow us to obtain a plausible range of values of the stellar parameters, taking into account any possible veiling from the accretion disk produced by the presence of a neutron star as the primary. We will study the chemical abundances of several elements and study their anomalies regarding Galactic trends.