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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20230330T103000
DTEND;TZID=Atlantic/Canary:20230330T113000
UID:iactalks-1636
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1636
CREATED:2023-03-30T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY: Accretion Disc Winds in Low-Mass X-Ray Binary Stars
DESCRIPTION: Accretion Disc Winds in Low-Mass X-Ray Binary Stars\nDr. Noel 
 Castro Segura\n\n \n\nDisc  winds and jets are ubiquitous among accre
 ting systems on all scales,  from active galactic nuclei (AGN) down to you
 ng stellar objects. They  represent a key mechanism through which these sy
 stems interact with  their environment  (“feedback") and may be resp
 onsible for triggering the mysterious state  changes observed in X-ray bin
 ary stars (XRBs).\n\nTransient low-mass X-ray binaries (LMXBs),  harbourin
 g a black hole or a neutron star, provide us with a natural  laboratory fo
 r studying the connection(s) between accretion discs, jets  and winds. &nb
 sp;These systems undergo outbursts,  during which they brighten dramatical
 ly across the whole  electromagnetic spectrum. The outbursts typically las
 t hundreds of days,  recur on timescales of decades, and reflect a sudden 
 increase in the  accretion rate onto the compact object. Over the course o
 f  an outburst, LMXBs exhibit two distinct spectral states. These spectral
   states are thought to be a consequence of different accretion  geometrie
 s close to the central object.\n\nRemarkably, the two distinct accretion  
 states also appear to produce two distinct types of outflows. Steady  comp
 act radio jets are only seen in the hard state, whereas evidence of  disc 
 winds originally came in the form of blue-shifted  X-ray absorption lines 
 associated with Fe ions detected only during the  soft state. However, rec
 ent observations of disc winds in the far-UV,  optical and NIR lines revea
 l a multiphase nature of these outflows that  may be present across the en
 tire outburst.   \n\nI will discuss the current status of disc winds 
 in LMXBs with special  emphasis in the latest results from far-UV spectros
 copy obtained with  the Hubble Space Telescope.\n \n \nZoom:&nbs
 p;https://rediris.zoom.us/j/86826646040?pwd=UmpEZmdKYW90QUpVelFKZitzTzhKUT
 09Meeting ID: 868 2664 6040Passcode: 610738\n \nYoutube: https:/
 /youtube.com/live/4-WXSHynTXw?feature=share
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