Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21535705p&link_type=abstract
American Astronomical Society, AAS Meeting #215, #357.05; Bulletin of the American Astronomical Society, Vol. 42, p.541
Astronomy and Astrophysics
Astrophysics
Scientific paper
A spectral-line survey of IRC+10216 has been carried out with the Submillimeter Array (SMA), covering the frequency range of 293.9-354.8 GHz. This is the first interferometric line survey of IRC+10216. The angular resolution is 3" and the typical rms noise level is 0.1 Jy/beam. Our survey is at least four times more sensitive than any earlier submillimeter survey. The survey has yielded 389 lines. A large fraction of the newly detected lines have narrow line-widths indicating expansion velocities of 4 km/s. These lines arise in the inner envelope, within 60 AU of the star, in the region of dust-formation where the stellar wind is still being accelerated. There are about 100 lines as yet unassigned to known transitions in standard line-catalogs. Many new lines are identified as rotational transitions in vibrationally excited states of molecules known in IRC+10216, such as SiCC, SiS, CS and their isotopologues. Lines of high excitation levels of >3000 K, e.g., CS v=2 J=7-6 and CO v=1 J=3-2 remain spatially unresolved in follow-up SMA observations at 0.8", suggesting deconvolved source size of < 0.2". Future observations by ALMA will have much higher sensitivity and angular resolution, up to 15 mas at 1 mm wavelength in its longest baseline configuration, allowing detailed studies of the dynamics and physical conditions of gas close to the stellar surface. The SMA is a joint collaboration between the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics.
Bruenken Sandra
Gottlieb C.
He Jingsong
Keto Eric
McCarthy Mary C.
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