Abstract.
We report the discovery of a strong overabundance of several \(\alpha\)-elements in the atmosphere of the star orbiting around the massive black hole in the binary system GRO J1655-40 (Nova Scorpii 1994). A high-resolution spectrum of this star obtained with the Keck I 10m telescope reveals the presence of extra strong absorption lines of O, Mg, Si, and S. Our analysis using spectral synthesis techniques and a suitable model atmosphere indicates that these elements are 6 to 10 times more abundant in the star than in the Sun. The overall spectrum of the companion resembles that of a normal subgiant star with a solar iron abundance. We interpret the enhanced abundances of \(\alpha\)-elements as a direct result of the nucleosynthesis in a supernova/hypernova explosion event associated with the progenitor of the black hole. This is to our knowledge up to now the most direct evidence for a link between a supernova explosion and the formation of a black hole.
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Israelian, G. Evidence of a Supernova Origin for the Black Hole in GRO J1655-40 (Nova Scorpii 1994). In: Kaper, L., Heuvel, E.P.J.v.d., Woudt, P.A. (eds) Black Holes in Binaries and Galactic Nuclei: Diagnostics, Demography and Formation. ESO ASTROPHYSICS SYMPOSIA. Springer, Berlin, Heidelberg. https://doi.org/10.1007/10720995_67
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DOI: https://doi.org/10.1007/10720995_67
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