Submillimeter narrow emission lines from the inner envelope of IRC+10216

Abstract

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 narrow lines have now been identified as rotational transitions in vibrationally excited states of previously detected molecules: the v=1, J=17--16 and J=19--18 lines of Si34S and 29SiS and the v=2, J=7--6 line of CS. Maps of these lines show that the emission is confined to a region within ~60 AU of the star, indicating that the narrow-line emission is probing the region of dust-formation where the stellar wind is still being accelerated.

5 pages, 5 figures, Accepted for publication in ApJ

References in corpus (3)

• A spectral line survey in the 2 mm and 1.3 mm windows toward the carbon rich envelope of IRC +10216
• High-J v=0 SiS Maser Emission in IRC+10216: A New Case of Infrared Overlaps
• Radio continuum monitoring of the extreme carbon star IRC+10216

Cited by in corpus (20)

• Molecular abundances in the inner layers of IRC +10216
• The inner wind of IRC+10216 revisited: New exotic chemistry and diagnostic for dust condensation in carbon stars
• A high resolution line survey of IRC+10216 with Herschel. First results: Detection of warm silicon dicarbide SiC2
• An Interferometric Spectral-line Survey of IRC+10216 in the 345 GHz Band
• Water in IRC+10216: a genuine formation process by shock-induced chemistry in the inner wind
• A 1.3 cm line survey toward IRC +10216
• The complex dust formation zone of the AGB star IRC+10216 probed with CARMA 0.25 arcsec angular resolution molecular observations
• The abundance of 28Si32S, 29Si32S, 28Si34S, and 30Si32S in the inner layers of the envelope of IRC+10216
• ATOMIUM: Molecular inventory of 17 oxygen-rich evolved stars observed with ALMA
• Accurate laboratory rest frequencies of vibrationally excited CO up to $varv=3$ and up to 2 THz
• Isotopic ratios at z=0.68 from molecular absorption lines toward B 0218+357
• Discovery of a Shell of Neutral Atomic Hydrogen Surrounding the Carbon Star IRC+10216
• IRC+10216's Innermost Envelope -- The eSMA's View
• SiS in the circumstellar envelope of IRC +10126: maser and quasi-thermal emission
• Vibrationally Excited C${}_4$H
• Multi-frequency high spectral resolution observations of HCN toward the circumstellar envelope of Y CVn
• Radio Stars and Their Lives in the Galaxy
• Vibrationally excited HCN transitions in circumstellar envelopes of carbon-rich AGB stars
• [C I] and [C II] emission in the circumstellar envelope of IRC +10216 I. Observational data and NLTE modeling of the [C I] emission
• High-Resolution Infrared Spectroscopy and ASAP Analysis of Cyclopentadiene: The Vibrational Modes below 860 cm${}^{-1}$ and the ${\nu }_{21}$ Mode at 961 cm${}^{-1}$