Query : 2014A&A...570A..45A

2014A&A...570A..45A - Astronomy and Astrophysics, volume 570A, 45-45 (2014/10-1)

New molecules in IRC +10216: confirmation of C5S and tentative identification of MgCCH, NCCP, and SiH3CN.


Abstract (from CDS):

The carbon-star envelope IRC +10216 harbors a rich variety of molecules, with more than 80 detected to date. During the course of a λ 3mm survey of IRC +10216 carried out with the IRAM 30-m telescope we have detected various weak lines, with antenna temperatures of a few mK, which we assign to rotational transitions of four new molecules. The observation of three lines of C5S confirms a previous tentative identification of this molecule based on a line at 24.0GHz. We also report the tentative identification of three molecules not yet observed in space: MgCCH, the first metal acetylide detected in space, and NCCP and SiH3CN, the phosphorus and silicon analogs of cyanogen (NCCN) and methyl cyanide (CH3CN). We derive the following column densities: N(C5S)=(2-14)x1012cm–2 (depending on the rotational temperature adopted), N(MgCCH)=2x1012cm–2, N(NCCP)=7x1011cm–2, and N(SiH3CN)=1012cm–2. The S-bearing carbon chain C5S is less abundant than C3S, while MgCCH has an abundance in between that of MgNC and those of MgCN and HMgNC. On the other hand, NCCP and SiH3CN are the least abundant P- and Si-bearing molecules observed to date in IRC +10216. Based on the behavior of similar molecules it is likely that these four species are formed in the outer circumstellar layers of IRC +10216. We discuss possible gas-phase formation routes.

Abstract Copyright:

Journal keyword(s): astrochemistry - circumstellar matter - stars: AGB and post-AGB - stars: carbon - stars: individual: IRC +10216 - lines: stars radio

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2223 1
2 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2275 0

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