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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20211123T170000
DTEND;TZID=Atlantic/Canary:20211123T180000
UID:iactalks-1531
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1531
CREATED:2021-11-23T17:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:IAU G5: "Extreme Precision Stellar Spectroscopy"
DESCRIPTION:IAU G5: "Extreme Precision Stellar Spectroscopy"\nDr. Dainis Dr
 avins\n\nThe new generation of spectrometers designed for extreme precisio
 n radial velocities enable correspondingly precise stellar spectroscopy. I
 t is now fruitful to theoretically explore what the information content wo
 uld be if stellar spectra could be studied with spectral resolutions of a 
 million or more, and to deduce what signatures remain at lower resolutions
 . Hydrodynamic models of stellar photospheres predict how line profiles sh
 apes, asymmetries, and convective wavelength shifts vary from disk center 
 to limb. Corresponding high-resolution spectroscopy across spatially resol
 ved stellar disks is now practical using differential observations during 
 exoplanet transits, thus enabling the testing of such models. A most deman
 ding task is to understand and to model spectral microvariability toward t
 he radial-velocity detection of also low-mass planets in Earth-like orbits
  around solar-type stars. Observations of the Sun-as-a-star with extreme p
 recision spectrometers now permit searches for spectral-line modulations o
 n the level of a part in a thousand or less, feasible to test against hydr
 odynamic models of various solar features.
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