A black hole in the X-ray transient XTE J1859+226: the first confirmed with GTC

Corral-Santana, J. M.; Casares, J.; Shahbaz, T.; Zurita, C.; Martínez-Pais, I. G.; Rodríguez-Gil, P.
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Fourth Science Meeting with the GTC (Eds. C. Muñoz-Tuñón & J. M. Rodríguez-Espinosa) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 42, pp. 3-4 (2013) (http://www.astroscu.unam.mx/~rmaa/)

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We present the results of the analysis of the first black hole confirmed with GTC in the X-ray binary system XTE J1859+226. By combining optical photometry taken with the INT, WHT and NOT with long-slit spectroscopy with OSIRIS+GTC, we have obtained an orbital period of 6.58 h, a secondary star radial velocity amplitude of K_2=541±70 km s^-1 and an upper limit to the inclination of 70°, implying a black hole mass of at least 5.4 M⊙.