Mm-wave and far-IR Molecular line survey of OH 231.8+4.2: Hard-boiled rotten eggs - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Proceedings of the conference Asymmetrical Planetary Nebulae VI Année : 2014

Mm-wave and far-IR Molecular line survey of OH 231.8+4.2: Hard-boiled rotten eggs

C. Sánchez Contreras
  • Fonction : Auteur
L. Velilla
  • Fonction : Auteur
J. Alcolea
  • Fonction : Auteur
J. Cernicharo
M. Agúndez
D. Teyssier
V. Bujarrabal
  • Fonction : Auteur
A. Castro-Carrizo
J. P. Fonfria
  • Fonction : Auteur
P. Garcia-Lario
  • Fonction : Auteur
Fabrice Herpin
M. Barlow
  • Fonction : Auteur
I. Cherchneff
  • Fonction : Auteur
M. Cordiner
L. Decin
  • Fonction : Auteur
D.~t. Halfen
  • Fonction : Auteur
W. Latter
  • Fonction : Auteur
G. Malloci
  • Fonction : Auteur
K. Menten
  • Fonction : Auteur
H. S. P. Muller
  • Fonction : Auteur
B. Swinyward
  • Fonction : Auteur
E. Tenenbaum
  • Fonction : Auteur
R. Wesson
  • Fonction : Auteur
L. Ziurys
  • Fonction : Auteur

Résumé

Envelopes around evolved stars are extraordinarily efficient factories of complex molecules and dust particles that will eventually enrich the ISM. To date, most chemistry studies have focused on C-rich envelopes, expected to show the largest molecular variety and abundances. Recent observations suggest that O-rich shells may be as chemically diverse as their Carbon counterparts, however, no serious attempt has been made yet to perform a full frequency scan of such objects. In this conference, I will report the first results from our spectral line surveys with the IRAM 30m telescope (~80-345 GHz) and Herschel/HIFI (~479-1244 GHz) of the well known, O-rich pre-PN OH 231.8+4.2 (a.k.a. The Rotten Egg nebula after the high abundance of Hydrogen sulfide, H2S, in its envelope). This object displays fast (>400 km/s), bipolar outflows and a molecular richness unparalleled amongst O-rich AGB and post-AGB stars. These surveys have led to the detection of hundreds of lines from different species, many of them detected for the first time in O-rich CSEs, that clearly confirm OH231.8+4.2 as the ''The Rosetta-stone'' for studying non-equilibrium, shock-induced molecule formation processes in O-rich environments. HIFI data have been particularly crucial to trace the physico-chemical conditions in the warm, dense circumstellar layers, which are not proved by lower-energy/frequency transitions. At these high frequencies, H2O and S-containing species are, together with CO, the dominant contributors to the total line flux observed. The main product from these surveys, is a molecular inventory and unprecentedly detailed chemical study (in progress) of an O-rich molecular flow accelerated by fast shocks.
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Dates et versions

hal-00978991 , version 1 (15-04-2014)

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Citer

C. Sánchez Contreras, L. Velilla, J. Alcolea, G. Quintana-Lacaci, J. Cernicharo, et al.. Mm-wave and far-IR Molecular line survey of OH 231.8+4.2: Hard-boiled rotten eggs. Asymmetrical Planetary Nebulae VI, 2013, Playa del Carmen, Mexico. pp.88. ⟨hal-00978991⟩
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