Nearinfrared VLT adaptive optics imaging of planetary nebulae

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Near-infrared VLT adaptive optics imaging of
planetary nebulae

• Eric Lagadec
• (University of Manchester, UK)
• Main co-workers Albert Zijlstra (University of
  Manchester), Olivier Chesneau (OCA, Grasse),
  Mikako Matsuura (NAOJ, Japan), Djamel Mékarnia
  (OCA, Nice), José A. de Freitas Pacheco (OCA,
  Nice)

APN4, La Palma, 19/06/2007
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Adaptive optics imaging at the VLT

• NACO (Naos-Conica) on UT4 8.2m telescope
• Diffraction-limited imaging in the optical and
  near-IR
• Resolution 60 mas (K-L bands)
• Field of view from 1414 to 5656

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Hen 2-113 morphology core

• Infrared excess in the resolved (155 mas) core
• Warm dust (900-1000K)
• Similar dust in IRAS 16342-3814 (Sahai et al.
  2005) and IRAS 18276-1431 (Sanchez Contreras et
  al. 2007)

NACO L (3.8 µm) (Lagadec et al. 2006)
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The post-AGB star Roberts 22
HST optical image (Sahai et al. 1999)
Near-infrared NACO composite image of Roberts 22
(Lagadec et al. 2007 in preparation, Eso
messenger 124-21, 77)
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Motion of the envelope?

• Jets up to 450 km.s-1 (Sahai et al. 1999)
• D2kpc
• HST observations 3 years before
• 0.1 in 3 yrs

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NACOMIDI observations of OH 231.8
NACO observations of the post-AGB star OH 231.8
(Matsuura, Chesneau et al. (2006) 2727)
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OH 231.83.4 dusty shell or disc?
Measurements only with baselines perpendicular
to the bipolar lobes Dusty
structure size measured in just one direction
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First results
Gaussian Fit
Not a disc but rather a flattened shell (Lagadec
et al. in preparation)
Visibilities similar to the Symbiotic Star HM Sge
(Sacuto et al. 2007)
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Interaction with a hot companion?
Soker Livio (2001)
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V Hya

• Evolved AGB star with high velocity jets
  (200km.s-1)
• Jet orientated East-West (Sahai et al. 2003 and
  Hirano et al. 2004)
• An AGB star caught in the shaping act??

3.74 µm NACO image of V Hya (Mékarnia et al. in
preparation)
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Summary

• Hen 2-113 warm dust (900K) in the core
• Roberts 22 complex S-shaped morphology
  expansion?
• OH 231.8 Detection of a 25 mas (40 a.u.) dust
  core
• V Hya Spherical at large scales, departure from
  spherical symmetry at scale below 1 (300 a.u.)

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Muchas Gracias! Thank you! Merci! ???????
! Trugarez! Obrigado! e??a??st? ! Kheili mamnun
! Multumesc ! ????? Dekuji !
Dank u! ???? Grazie! Danke! Tänan! Mèsi! ?????
Dziekuje! Tatenda! Kiitos! Tankje wol!
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CO observations of V Hya
Schematic geometry of V Hya
Hirano et al. (2004)
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Formation of OH 231.8 3.4
Soker Livio (2001)