منابع مشابه
The circumstellar molecular envelope of HD 101584
CO radio line observations reveal a molecular gas envelope around the peculiar star HD101584 with characteristics very similar to those of wellknown young post-AGB objects. We estimate that there is at least 0.1 M of molecular gas, very likely remnant gas from a former AGB-envelope. This gas has been efficiently accelerated to very high velocities (>50 km s−1, and a significant fraction to >100...
متن کاملThe circumstellar envelope of π 1 Gru
CO(J = 2–1) and SiO(J = 5–4) emission has been observed from the molecular envelope around the nearby S star π1 Gru. The CO line profile differs from the usual parabolic shape seen in uniformly-expanding envelopes; it has a Voigtlike profile and two horns. A model for line formation in the envelope shows that a tilted, expanding disk reproduces the observations well. The star also has a fast mo...
متن کاملUnveiling the Circumstellar Envelope and Disk: A Sub-Arcsecond Survey of Circumstellar Structures
We present the results of a λ = 2.7 mm continuum interferometric survey of 24 young stellar objects in 11 fields. The target objects range from deeply embedded Class 0 sources to optical T Tauri sources. This is the first sub-arcsecond survey of the λ = 2.7 mm dust continuum emission from young, embedded stellar systems. These multi-array observations, utilizing the high dynamic u,v range of th...
متن کاملMODERATE ASPHERICITY OF THE SN 2002ic CIRCUMSTELLAR ENVELOPE
The polarization of SN 2002ic interacting with a dense circumstellar envelope is calculated in the context of the asymmetric version of a previously proposed spherical interaction model. The circumstellar envelope is taken to be oblate. The observed polarization (Wang et al. 2004) can be reproduced for an aspect ratio of 0.65-0.7 assuming inclination angles > 60. This model predicts a weak sens...
متن کاملMassive circumstellar envelope around type IIn supernova SN 1995
We model the interaction of the supernova SN 1995G with a dense circum-stellar (CS) gas in a thin shell approximation. A model fit of the observed bolometric light curve combined with data on the supernova expansion velocity provides an estimate of the density of the CS shell, its mass (≈ 1 M ⊙), and age (≈ 8 years). It is shown that the derived CS gas density does not depend on the assumed mas...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2010
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921311006867