2000A&A...363L...9G


Query : 2000A&A...363L...9G

2000A&A...363L...9G - Astronomy and Astrophysics, volume 363, L9-12 (2000/11-1)

Astronomical detection of the free radical SiCN. (Letter to the Editor).

GUELIN M., MULLER S., CERNICHARO J., APPONI A.J., McCARTHY M.C., GOTTLIEB C.A. and THADDEUS P.

Abstract (from CDS):

We report the detection of the SiCN radical in an astronomical source, the envelope of the C star IRC +10216/CW Leo. The microwave spectrum of SiCN was recently studied by four of us in the laboratory and the rotational transition frequencies were accurately measured. The ground fine structure state, 2Π1/2, has three rotational transitions, each with λ-doubling in the 80-116GHz atmospheric window (J=7.5->6.5, 8.5->7.5 and 9.5->8.5, at 83.0, 94.0, and 105.1 GHz). The three λ-doublets (six components) are detected at a level of 5 mK with the IRAM 30-m telescope. Judging from the cusped shape of the line profiles, SiCN is largely confined to the outer molecular envelope, like most other radicals. Its abundance relative to H2 is estimated to be 4x10–9, a factor of 20 lower than that of MgNC. The isoelectronic radical SiCCH was not detected. We confirm our previous tentative detections of the carbon chain H2C6 and of NP in IRC+10216.

Abstract Copyright:

Journal keyword(s): molecular data - stars: circumstellar matter - stars: AGB and post-AGB - ISM: molecules - radio lines: stars

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1520 0
2 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2161 1
3 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2239 0
4 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2092 1

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2022.05.23-22:03:27

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