1. 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

2. 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 14”*14” to 56”*56”

3. Hen morphology+ core
HST Ha image (Sahai et al. 2000)
1 ’’
Infrared excess in the resolved (155 mas) core
Warm dust ( K)
Similar dust in IRAS (Sahai et al. 2005) and IRAS (Sanchez Contreras et al. 2007)
NACO L’ (3.8 μm) (Lagadec et al. 2006)

4. The post-AGB star Roberts 22
HST optical image (Sahai et al. 1999)
Near-infrared NACO composite image of Roberts 22 (Lagadec et al in preparation, Eso messenger , 7”*7”)

5. Motion of the envelope? Jets up to 450 km.s-1 (Sahai et al. 1999)
D=2kpc
HST observations 3 years before
0.1” in 3 yrs

6. NACO+MIDI observations of OH 231.8
See (and listen to!) Olivier Chesneau and Pieter Deroo’s talks!!!
NACO observations of the post-AGB star OH (Matsuura, Chesneau et al. (2006) 27”*27”)

7. OH 231.8+3.4: dusty shell or disc?
New observations (PI: E. Lagadec) with 4 new baselines just obtained
Measurements only with baselines ~ perpendicular to the bipolar lobes
Dusty structure size measured in just one direction

8. First results
Equatorial plan
Along the poles
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)

9. Interaction with a hot companion?
Soker & Livio (2001)

10. 3.74 μm NACO image of V Hya (Mékarnia et al. in preparation)
More to come when D. Mékarnia will be back from his 13 months stay in Antarctica!
Evolved AGB star with high velocity jets (~200km.s-1)
Jet orientated East-West (Sahai et al 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)

11. 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.)

12. Muchas Gracias!
Thank you!
Merci!
спасибо !
Trugarez!
Obrigado!
ευχαριστώ !
Kheili mamnun !
Mulţumesc !
شكراً
Děkuji !
Dank u!
תודה
Grazie!
Danke!
Tänan!
Mèsi!
ありがとう
Dziękuję!
Tatenda!
Kiitos!
Tankje wol!

13. CO observations of V Hya
Schematic geometry of V Hya
Hirano et al. (2004)

14. Formation of OH
Soker & Livio (2001)