Spectroscopy of the Proto-Planetary Nebula CRL 618
نویسندگان
چکیده
منابع مشابه
A Survey of Large Molecules toward the Proto–planetary Nebula Crl 618
We present the results of our survey toward the proto–planetary nebula CRL 618 for several large, highly saturated, oxygen-bearing organic molecules of biological importance including acetaldehyde (CH3CHO), acetic acid (CH3COOH), dimethyl ether (CH3OCH3), ethanol (CH3CH2OH), formic acid (HCOOH) and methyl formate (HCOOCH3); large carbon chain molecules including methyl cyanide (CH3CN), methylcy...
متن کاملDetection of HCN Direct l - Type Transitions Probing Hot Molecular Gas in the Proto - Planetary Nebula CRL 618
We report the detection of direct ℓ-type transitions towards the proto-planetary nebula CRL 618 during a study of vibrationally excited carbon chains. ∆J = 0 transitions of HCN in its first excited bending mode v 2 = 1 were detected in absorption against the continuum of the central H ii region making use of the Effelsberg 100 m telescope and the Very Large Array. Additionally, the J = 9 direct...
متن کامل0 Fe b 20 09 Collimated Fast Wind in the Pre - Planetary Nebula CRL 618
Collimated fast winds (CFWs) have been proposed to operate during the post-AGB evolutionary phase (and even earlier during the late AGB phase), responsible for the shaping of pre-planetary nebulae (PPNs) and young planetary nebulae (PNs). This paper is a follow-up to our previous study of CFW models for the well-studied PPN CRL 618. Previously, we compared our CFW models with optical observatio...
متن کاملSpectroscopy of the protoplanetary nebula AFGL 618
We report on new optical spectroscopic observations of the protoplanetary nebula AFGL 618. Compared to older observations we find a change in some emission line ratios indicating dynamical evolutionary processes during the last few years. Possible reasons for this behaviour are discussed.
متن کاملThe Shaping of the Red Rectangle Proto-planetary Nebula
I argue that the slowly expanding biconical structure of the Red Rectangle−a nebula around the post asymptotic giant branch binary stellar system HD 44179−can be formed by intermittent jets blown by the accreting companion. The bright biconical structure of the Red Rectangle nebula can be understood to be composed of a multiple double-ring system. In the proposed shaping process, one among seve...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1997
ISSN: 0074-1809
DOI: 10.1017/s0074180900131201