BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//ZContent.net//ZapCalLib 1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20190328T113000
DTEND;TZID=Atlantic/Canary:20190328T123000
UID:iactalks-1284
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1284
CREATED:2019-03-28T11:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Properties and evolutionary state of massive stars across the HR di
 agram
DESCRIPTION:Properties and evolutionary state of massive stars across the H
 R diagram\nDr. Michalis Kourniotis\n\nThe advanced stages of high-mass sta
 rs are characterized by episodic mass loss shed during phases of instabili
 ty. Key for assigning these stars a proper evolutionary state is to assess
  the composition and geometry of their ejecta alongside the stellar proper
 ties. I will speak about my work to increase the number of B[e] supergiant
 s, Yellow Hypergiants and Luminous Blue variables in the Local Group by in
 vestigating circumstellar environments and exploring the evolutionary prop
 erties of high-luminous, dusty targets. By conducting and analyzing optica
 l spectroscopy alongside fitting the spectral energy distribution, I deriv
 e stellar properties and infer the presence of circumstellar dust. In sear
 ch of processed ejected material, modeling of the CO band heads in the K-b
 and is further employed. Results of my work in M33 include the discovery o
 f a strong Yellow Hypergiant candidate showing evidence of past eruption. 
 Moreover, the insight into the surrounding molecular environment witnesses
  the presence of circumstellar/binary disks around post-supergiant/evolved
  stars. I highlight the importance of the infrared data to resolve the evo
 lutionary status of massive stars and thus, to constrain the physics of th
 e diverse pre-supernova stellar states. Finally, I will speak about my wor
 k at IAC regarding the photometric properties of OB stars in conjunction t
 o the latest Gaia Data Release 2 and their possible link to the line-broad
 ening status of the stars.
END:VEVENT
END:VCALENDAR