The dust envelope of IRC +10216
نویسندگان
چکیده
منابع مشابه
Dust emission from IRC + 10216
Infrared emission from the dust shell around IRC+10216 is analysed in detail, employing a self-consistent model for radiatively driven winds around late-type stars that couples the equations of motion and radiative transfer in the dust. The resulting model provides agreement with the wealth of available data, including the spectral energy distribution in the range 0.5–1000 μm, and visibility an...
متن کاملTentative detection of phosphine in IRC +10216
Aims. The JK = 10−00 rotational transition of phosphine (PH3) at 267 GHz has been tentatively identified with a TMB ∼ 40 mK spectral line observed with the IRAM 30-m telescope in the C-star envelope IRC +10216. Methods. A radiative transfer model was used to fit the observed line profile. Results. The derived PH3 abundance relative to H2 is 6 × 10−9, although it may have a large uncertainty due...
متن کاملVariable sub - arcsecond structure in the circumstellar envelope of IRC + 10216 ?
We present new diffraction-limited interferometric images of the carbon star IRC+10216 at wavelengths of 2.2 µm and 3.4 µm. These show that the distribution of the near-infrared emission from the star departs significantly from a spherical geometry on 0.1 arcsecond scales. At 3.4 µm, i.e. close to the peak of the star/dust-shell spectral energy distribution, approximately 60% of the flux comes ...
متن کاملSubmillimeter Narrow Emission Lines from the Inner Envelope of Irc+10216
A spectral-line survey of IRC+10216 in the 345 GHz band has been undertaken with the Submillimeter Array. Although not yet completed, it has already yielded a fairly large sample of narrow molecular emission lines with line-widths indicating expansion velocities of ∼4 km s, less than 3 times the well-known value of the terminal expansion velocity (14.5 km s) of the outer envelope. Five of these...
متن کاملThe Distribution of Sio in the Circumstellar Envelope around Irc+10216
New interferometric observations of SiO J =5→ 4 circumstellar line emission around the carbon star IRC+10216, using the Submillimeter Array, are presented. Complemented by multi-transition single-dish observations, including infrared observations of ro-vibrational transitions, detailed radiative transfer modelling suggests that the fractional abundance of SiO in the inner part of the envelope, ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1987
ISSN: 0074-1809
DOI: 10.1017/s0074180900157250