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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20110407T000000
DTEND;TZID=Atlantic/Canary:20110407T010000
UID:iactalks-255
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/255
CREATED:2011-04-07T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Are magnetic fields shaping PNe?
DESCRIPTION:Are magnetic fields shaping PNe?\nDr. María Jesús Martínez\n
 \nThis question is important because a large fraction of planetary nebulae
  (about 80%) are bipolar or elliptical rather than spherically symmetric. 
 Modern theories invoke magnetic fields, among other causes, to explain the
  rich variety of aspherical components observed in PNe, as ejected matter 
 is trapped along magnetic field lines. But, until recently, this idea was 
 mostly a theoretical claim. Jordan et al. (2005) report the detection of k
 G magnetic fields in the central star of two non-spherical PNe, namely NGC
 1360 and LSS1362. We find that, contrary to that work, the magnetic field 
 is null within errors for both stars. Then, a direct evidence of magnetic 
 fields on the central stars of PNe is still missing — either the mag
 netic field is much weaker (< 600 G) than previously reported, or more 
 complex (thus leading to cancellations), or both. The role of magnetic fie
 lds shaping PNe is still an open question.
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