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Near-infrared VLT adaptive optics imaging of planetary nebulae

Near-infrared VLT adaptive optics imaging of planetary nebulae. Eric Lagadec (University of Manchester, UK)

hoshiko-miyamoto
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Near-infrared VLT adaptive optics imaging of planetary nebulae

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  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. 1 ’’ HST Haimage (Sahai et al. 2000) 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)

  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. 2007 in preparation, Eso messenger 124-21, 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. See (and listen to!) Olivier Chesneau and Pieter Deroo’s talks!!! NACO+MIDI observations of OH 231.8 NACO observations of the post-AGB star OH 231.8 (Matsuura, Chesneau et al. (2006) 27”*27”)

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

  8. Along the poles Equatorial plan 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)

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

  10. More to come when D. Mékarnia will be back from his 13 months stay in Antarctica! 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)

  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 231.8 +3.4 Soker & Livio (2001)

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