IRC +10216 as a spectroscopic laboratory: improved rotational constants for SiC2, its isotopologues, and Si2C
نویسندگان
چکیده
منابع مشابه
Dust emission from IRC + 10216
Infrared emission from the dust shell around IRC+10216 is analysed in detail, employing a self-consistent model for radiatively driven winds around late-type stars that couples the equations of motion and radiative transfer in the dust. The resulting model provides agreement with the wealth of available data, including the spectral energy distribution in the range 0.5–1000 μm, and visibility an...
متن کاملA Submillimeter HCN Laser in IRC +10216.
We report the detection of a strong submillimeter-wavelength HCN laser line at a frequency near 805 GHz toward the carbon star IRC +10216. This line, the J=9-8 rotational transition within the (0400) vibrationally excited state, is one of a series of HCN laser lines that were first detected in the laboratory in the early days of laser spectroscopy. Since its lower energy level is 4200 K above t...
متن کاملTentative detection of phosphine in IRC +10216
Aims. The JK = 10−00 rotational transition of phosphine (PH3) at 267 GHz has been tentatively identified with a TMB ∼ 40 mK spectral line observed with the IRAM 30-m telescope in the C-star envelope IRC +10216. Methods. A radiative transfer model was used to fit the observed line profile. Results. The derived PH3 abundance relative to H2 is 6 × 10−9, although it may have a large uncertainty due...
متن کاملImproved isotopic ratio determinations in IRC+10216, the progenitor mass and the s process
We present an improved determination of the chlorine isotopic ratio in the circumstellar envelope IRC+10216. This determination is the first clear evidence that in this circumstellar envelope elements heavier than the CNO do show deviations from the solar isotopic ratios, thus allowing a detailed comparison with quantitative model predictions. We have compared these data, together with other me...
متن کاملA molecular line survey of the extreme carbon star CRL3068 at millimeter wavelengths
We present the results of a molecular line survey of the extreme carbon star CRL3068. The observations were carried out with the Arizona Radio Observatory (ARO) 12m telescope and the Heinrich Hertz Submillimeter Telescope (SMT) at the λ 2mm and λ 1.3mm atmospheric windows. The observations cover the frequency bands from 130–162GHz and 219.5–267.5GHz. The typical sensitivities achieved are TR < ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2018
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201833335