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VERSION:2.0
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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20170112T103000
DTEND;TZID=Atlantic/Canary:20170112T113000
UID:iactalks-980
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/980
CREATED:2017-01-12T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Characterization of stars (with and without planets) from Hubble ab
 solute flux  spectrophotometry
DESCRIPTION:Characterization of stars (with and without planets) from Hubbl
 e absolute flux  spectrophotometry\nDr. Carlos del Burgo\n\nThis talk show
 s an spectrophotometric analysis of HD 209458 and 18 A type stars. We have
  used absolute flux spectrophotometry obtained with the Hubble Space Teles
 cope  and Kurucz model atmospheres to ascertain the angular diameters
  (precision of about 1%) and effective temperatures (similar or better tha
 n 1%). The same analysis also permits the determination of other stellar p
 arameters such as metallicity and surface gravity. The A type stars were s
 elected from the STIS Next Generation Spectral Library because they match 
 our criteria that their absolute fluxes in the optical are reliable to wit
 hin 3 per cent by comparing their HST spectra with Kurucz theoretical mode
 ls. HD 209458 harbors the first transiting planet discovered and it is one
  of only two systems with absolute stellar and planetary masses derived fr
 om high-resolution spectroscopy. We updated the stellar radius by combinin
 g the angular diameter with the Gaia parallax and then the planetary radiu
 s with unprecedented precision. We have also determined the stellar parame
 ters from stellar evolution models. Finally, our results are compared with
  those from the literature.
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