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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20151104T123000
DTEND;TZID=Atlantic/Canary:20151104T133000
UID:iactalks-844
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/844
CREATED:2015-11-04T12:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Peering into the origin of substructures in M31 using planetary neb
 ulae
DESCRIPTION:Peering into the origin of substructures in M31 using planetary
  nebulae\nDr. Xuan Fang\n\nPlanetary nebulae (PNe) are excellent tracers t
 o study the chemistry, kinematics, and stellar populations of galaxies.&nb
 sp; They can be used to constrain the properties of galactic substructures
  and peer into the past tidal interactions.  In this talk, I present 
 our successful GTC observations of PNe in the Northern Spur and the Giant 
 Stream, two most prominent substructures of M31.  The deep spectrosco
 py enabled detection of the weak [O III] 4363 temperature-diagnostic line 
 in all target PNe and as a consequence, reliable determination of elementa
 l abundances. Our PN sample have homogeneous oxygen abundances, although s
 light difference between the two substructures are marginally noticed. The
  study of abundances and the spatial and kinematical properties of our sam
 ple leads to the tempting conclusions: 1) their progenitors  might belong 
 to the same stellar population, and 2) the Northern Spur and the Giant Str
 eam may have the same origin and may be explained by the stellar orbit pro
 posed by Merrett et al. The dwarf satellite M32 might be responsible for t
 he two substructures. Deep spectroscopy of PNe in M32 will help to assess 
 this hypothesis.
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