An upper limit to the hydroxyl abundance in the circumstellar envelope of IRC + 10216
نویسندگان
چکیده
منابع مشابه
The 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, ...
متن کاملGuiding the search for Si2Hx species in the Circumstellar Envelope of IRC+10216
Silicon-bearing species Si2Hx (x = 1–6) are probable candidates in the circumstellar envelope of IRC+10216. We have observed several fundamentals of new silicon-containing radicals Si2H3 and Si2H5 in addition to the well-known Si2H4 and Si2H6 species from infrared spectroscopy in low temperature silane matrices at 10 K. Several infrared bands identify the Si2Hx species and can be used to search...
متن کاملOxygen Chemistry in the Circumstellar Envelope of the Carbon-rich Star Irc+10216
In this paper we study the oxygen chemistry in the C-rich circumstellar shells of IRC+10216. The recent discoveries of oxygen bearing species (water, hydroxyl radical and formaldehyde) toward this source challenge our current understanding of the chemistry in C-rich circumstellar envelopes. The presence of icy comets surrounding the star or catalysis on iron grain surfaces have been invoked to ...
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 کاملModelling enhanced density shells in the circumstellar envelope of IRC + 10216
The circumstellar envelopes of very evolved, late-type asymptotic giant branch stars exhibit complex molecular structure. The most striking of these objects is the carbon star IRC +10216 (CW Leo), where over 50 molecular species, including carbon chains with up to nine carbon atoms, have been detected. The envelope of IRC +10216 is now known to contain dust shells of enhanced density which are ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1992
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/254.1.7