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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20190625T123000
DTEND;TZID=Atlantic/Canary:20190625T133000
UID:iactalks-1299
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1299
CREATED:2019-06-25T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Surface rotation and photometric activity of Kepler solar-type star
 s
DESCRIPTION:Surface rotation and photometric activity of Kepler solar-type 
 stars\nDr. Angela Santos\n\nBrightness variations due to dark spots on the
  stellar surface encode  information about stellar surface rotation and ma
 gnetic activity. As  stars slow down and become less active, the rotation 
 rate is observed to  decrease, thus rotation is often used as a diagnostic
  for age. Rotation  and magnetic fields affect stellar evolution and the m
 ode frequencies  used to infer fundamental properties of stars. Furthermor
 e, rotation  itself is an important ingredient for dynamo mechanisms. Ther
 efore, it  is of extreme importance to constrain surface rotation and magn
 etic  properties of stars. In this work, we analyze the spot modulation in
   light-curves for main-sequence and subgiant stars observed by Kepler  ma
 in-mission. We analyze four data sets: KADACS time-series obtained for  20
 -, 55-, and 80-day filters; and PDC-MAP time-series. The rotation  estimat
 es are retrieved through a combination of wavelet analysis and  the autoco
 rrelation function of light-curves. Reliable rotation periods  are determi
 ned by comparing the rotation estimates obtained from the  different diagn
 ostics and for the different time-series. We recover  rotation periods for
  more than 60% of the targets. For those, we also  study the photometric a
 ctivity level and lifetime of active regions. We  find the rotation rate t
 o increase with effective temperature and mass,  while the photometric act
 ivity proxy increases towards fast rotators.  Active region lifetimes are 
 found to be longer with increasing rotation  rate and photometric activity
 . In this analysis we also identify  potential polluters, such as mis-clas
 sified Red Giants, classical  pulsator candidates, and photometric polluti
 on of light-curves.
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