Optical observations of the black hole candidate XTE J1550-564 during the Sep/Oct 1998 outburst

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dc.creatorSanchez-Fernandez, C.
dc.creatorCastro-Tirado, A. J.
dc.creatorDuerbeck, H. W.
dc.creatorMantegazza, L.
dc.creatorBeckmann, V.
dc.creatorBurwitz, V.
dc.creatorVanzi, L.
dc.creatorBianchini, A.
dc.creatorDella Valle, M.
dc.creatorPiemonte, A.
dc.creatorDirsch, B.
dc.creatorHook, I.
dc.creatorYan, L.
dc.creatorGimenez, A.
dc.date1999-06-27
dc.date.accessioned2026-07-07T02:32:12Z
dc.date.available2026-07-07T02:32:12Z
dc.descriptionWe report here optical observations during the September/October 1998 outburst of the black hole candidate XTE J1550-564. CCD photometry was obtained for the optical counterpart with the 0.9m Dutch telescope at La Silla since the onset of this event. We analysed 211 U, V and i frames, from Sep 10 to Oct 23. Stochastic flaring activity was observed on Sep 11-16, but no evidence for a superhump period, as seen in other soft X-ray transients, was found. An optical flare nearly simultaneous to an X-ray flare that occurred on Sep 21 was observed in the V-band. A reddened optical spectrum showed the typical emission lines corresponding to X-ray transients in outburst. From the interstellar absorption lines, we derive E(B-V) = 0.70 +/- 0.10 and suggest a distance of about 2.5 kpc. In such case, M_{B} = +7 mag. for the progenitor, which is consistent with the spectral type of a low-mass K0-K5 main-sequence companion.
dc.descriptionAccepted for publication in Astronomy and Astrophysics Letters (4 pages, 4 figures)
dc.identifierhttps://arxiv.org/abs/astro-ph/9906434
dc.identifierhttp://arxiv.org/abs/astro-ph/9906434
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14423
dc.subjectAstrophysics
dc.titleOptical observations of the black hole candidate XTE J1550-564 during the Sep/Oct 1998 outburst
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