<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>13</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Castro Segura, Noel</style></author><author><style face="normal" font="default" size="100%">Knigge, Christian</style></author><author><style face="normal" font="default" size="100%">Long, Knox S.</style></author><author><style face="normal" font="default" size="100%">Altamirano, Diego</style></author><author><style face="normal" font="default" size="100%">Armas Padilla, Montserrat</style></author><author><style face="normal" font="default" size="100%">Casares, Jorges</style></author><author><style face="normal" font="default" size="100%">Charles, Philip A.</style></author><author><style face="normal" font="default" size="100%">Degenaar, Nathalie</style></author><author><style face="normal" font="default" size="100%">Fender, Rob</style></author><author><style face="normal" font="default" size="100%">Gandhi, Poshak</style></author><author><style face="normal" font="default" size="100%">Hernandez Santisteban, Juan Venancio</style></author><author><style face="normal" font="default" size="100%">Higginbottom, Nick</style></author><author><style face="normal" font="default" size="100%">Jimenez-Ibarra, Felipe</style></author><author><style face="normal" font="default" size="100%">Matthews, James</style></author><author><style face="normal" font="default" size="100%">Mendez, Mariano</style></author><author><style face="normal" font="default" size="100%">Middleton, Matthew</style></author><author><style face="normal" font="default" size="100%">Munoz Darias, Teo</style></author><author><style face="normal" font="default" size="100%">Ozbey Arabaci, Mehtap</style></author><author><style face="normal" font="default" size="100%">Pahari, Mayukh</style></author><author><style face="normal" font="default" size="100%">Paice, John</style></author><author><style face="normal" font="default" size="100%">Perez-Torres, Miguel</style></author><author><style face="normal" font="default" size="100%">Rhodes, Lauren</style></author><author><style face="normal" font="default" size="100%">Russell, Tom</style></author><author><style face="normal" font="default" size="100%">Scaringi, Simone</style></author><author><style face="normal" font="default" size="100%">Vasilopoulos, Georgios</style></author><author><style face="normal" font="default" size="100%">Vicentelli, Federico</style></author><author><style face="normal" font="default" size="100%">Williams, David Richard Alexander</style></author><author><style face="normal" font="default" size="100%">van den Eijnden, Jakob</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Time-resolved UV spectroscopy of the accretion disk and wind in a super-Eddington black-hole X-ray transient</style></title><short-title><style face="normal" font="default" size="100%">HST Proposal</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2019</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2019/07/1</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://ui.adsabs.harvard.edu/abs/2019hst..prop15984C</style></url></web-urls></urls><pages><style face="normal" font="default" size="100%">15984</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In October 2018, Swift announced the discovery of a new Galactic X-ray transient, Swift J1858. Just before Sun-angle constraints rendered the system unobservable, follow-up observations revealed extreme flaring activity, of a kind that has so far only been seen in the famous black hole X-ray binary (BHXRB) V404 Cyg during its 2015 eruption and in V4641 Sgr. The peculiar behaviour of these sources is thought to be a consequence of super-Eddington accretion regime. &lt;P /&gt;After several months of unusual strong and rapid flaring in its high-luminosity state, Swift J1858 is currently exhibiting impressive optical P-Cygni profiles, suggesting the pres- ence of a dense and cool wind from the outer accretion disk. The dominant spectroscopic signatures of such winds are actually expected to lie in the far-ultraviolet region, but they are usually inaccessible in black-hole X-ray binaries, due to interstellar reddening. Given its low extinction, Swift J1858 provides us with a rare chance to study the accretion disk wind in the crucial ultraviolet band - an opportunity that was missed in the other two systems. &lt;P /&gt;Building on an ongoing multi-wavelength campaign (X-rays: NICER; optical: GTC; radio: VLA &amp; AMI), we therefore request far- and near-UV time-resolved spectroscopic observations of this system with HST/STIS+COS in order to (a) study its extreme accretion disk wind; (b) test proposed wind driving mechanisms; (c) characterize its UV variability properties and determine the origin of these variations; (d) construct the broad-band SED of the outer accretion disk that dominates the UV flux; and (e) determine the extinction towards the system in order to constrain the mass accretion rate.</style></abstract></record></records></xml>