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Modeling B[e]HD 62623 Star Envelope with VLTI/MIDI

Investigation of the B[e] phenomenon in hot stars like B[e]HD 62623, characterized by forbidden lines, dust envelope, and high luminosity. Analysis of geometry and kinematics using VLTI/MIDI observations and gas+dust models. Study includes active phenomena, oversized supergiants, and published results.

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Modeling B[e]HD 62623 Star Envelope with VLTI/MIDI

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  1. Observations VLTI/MIDI & Modélisation de l’étoile B[e]HD 62623 Samer KANAAN Observatoire de la Côte d’Azur Site de Roquevignon Sous la directionde Philippe STEE Journée des doctorants 03/4/2009

  2. Le phénomène B[e] Étoile chaude De type O,B ou A Forte luminosité enveloppe de gaz Présence de raies interdites Enveloppe de poussière Géométrie et cinématique ? Actives : -excès IR -raies en émissions Supergéantes

  3. HD62623 A3Iabe R = 65Rsun Teff = 8250 K L=17000 Lsun D = 650 pc

  4. HD62623 Bittar et al. A&A 368,197-204 (2001) & Stee et al. ApJ 602, 978-984 (2004) Keck I 1997 – 1999 (interférométrie à masque d’ouverture) Modèle Gaz + poussière (sphérique) Teff = 10000 K Tsub = 1500 K R* = 55 Rsun Rin ≈ 4.5 - 6 AU i = 45° Rout ≈ 600 AU

  5. 17 mas 60 mas

  6. MC3D DUST Density Paramètres MC3D α, β Rin et Rout Inclinaison i Mdust Tsub dust T*, R* ou L* Choix ou création de catalogue de poussière

  7. MC3D (vent) α = 2 β = 1 MC3D (Keplerien) α = 3.5 β = 1.5 (Porter A&A 398,631-638 ,2003) Notre modèle MC3D α = 3.9 β = 1.55 Rin = 4 Rout = 130 (AU) Mdust =2 x 10-7 i=60° Tsub = 1250 K

  8. Orientation Bleu ~ 45° vert ~ 84° rouge ~ 27°

  9. Conclusion : • Rin = 4 AU • Aplatissement de l’enveloppe • Importance d’un code gaz + poussière

  10. Publications : • One ring to rule them all ? A&A 455, 953-961 (2006) • Disk and wind evolution of Achernar : breaking of a fellowship A&A 486, 785-798 (2008) • The environment of the fast rotating star Achernar. II. Thermal infrared interferometry with VLTI/MIDIA&A 493, L53-L56 (2009) • VLTI/MIDI observations of the B[e] supergiant HD 62623 (finalisation) • B[e] star HD 45677 (en préparation)

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