The Black Hole Binary Nova Scorpii 1994 (GRO J1655-40): An improved chemical analysis

Abstract

The chemical analysis of secondary stars of low mass X-ray binaries provides an opportunity to study the formation processes of compact objects, either black holes or neutron stars. Following the discovery of overabundances of $\alpha$-elements in the HIRES/Keck spectrum of the secondary star of Nova Scorpii 1994 (Israelian et al. 1999), we obtained UVES/VLT high-resolution spectroscopy with the aim of performing a detailed abundance analysis of this secondary star. Using a $\chi 2$-minimization procedure and a grid of synthetic spectra, we derive the stellar parameters and atmospheric abundances of O, Mg, Al, Ca, Ti, Fe and Ni, using a new UVES spectrum and the HIRES spectrum.The abundances of Al, Ca, Ti, Fe and Ni seem to be consistent with solar values, whereas Na, and especially O, Mg, Si and S are significantly enhanced in comparison with Galactic trends of these elements. A comparison with spherically and non-spherically symmetric supernova explosion models may provide stringent constraints to the model parameters as mass-cut and the explosion energy, in particular from the relative abundances of Si, S, Ca, Ti, Fe and Ni. Most probably the black hole in this system formed in a hypernova explosion of a 30--35 \Msun progenitor star with a mass-cut in the range 2--3.5 \Msun. However, these models produce abundances of Al and Na almost ten times higher than the observed values.

New Accepted version for publication in Astronomy and Astrophysics Table 2: Corrected

References in corpus (22)

• Nucleosynthesis of Zinc and Iron-Peak Elements in Pop III Type II Supernovae : Comparison with abundances of Very Metal-Poor Halo Stars
• Optical Observations of GRO J1655-40 in Quiescence I: A Precise Mass for the Black Hole Primary
• Variations in the Abundance Pattern of Extremely Metal-poor Stars and Nucleosynthesis in Population III Supernovae
• Supernova Nucleosynthesis in Population III 13 -- 50 $M_{\odot }$ Stars and Abundance Patterns of Extremely Metal-Poor Stars
• A non-LTE study of neutral and singly-ionized calcium in late-type stars
• Abundances of refractory elements in the atmospheres of stars with extrasolar planets
• The quiescent light curve and evolutionary state of GRO J1655-40
• Non-LTE Line-Formation and Abundances of Sulfur and Zinc in F, G, and K Stars
• The mass of X-Ray Nova Scorpii 1994 (=GRO J1655--40)]
• C, S, Zn and Cu abundances in planet-harbouring stars
• A Theory of Gamma-Ray Bursts
• Oxygen abundances in planet-harbouring stars. Comparison of different abundance indicators
• The runaway black hole GRO J1655-40
• Formation of the Black Hole in Nova Scorpii
• Behavior of Sulfur Abundances in Metal-Poor Giants and Dwarfs
• Chemical Abundances in the Secondary Star in the Black Hole Binary A0620-00
• Determining the spectroscopic mass ratio in interacting binaries: Application to X-Ray Nova Sco 1994
• XTE J1118+480: A Metal-Rich Black Hole Binary in the Galactic Halo
• On the distance of GRO J1655-40
• Chemical Abundances in the Secondary Star of the Neutron Star Binary Centaurus X-4
• Magnesium abundances in mildly metal-poor stars from different indicators
• On the abundances of GRO J1655-40

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• An Argument for Weakly-Magnetized, Slowly-Rotating Progenitors of Long Gamma-Ray Bursts
• A comprehensive search for high-velocity X-ray sources: New compact object binary candidates in the Gaia era