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J/ApJ/688/L83       Detection of C5N- in IRC +10216      (Cernicharo+, 2008)

Detection of C5N- and vibrationally excited C6H in IRC +10216. Cernicharo J., Guelin M., Agundez M., McCarthy M.C., Thaddeus P. <Astrophys. J., 688, L83-L86 (2008)> =2008ApJ...688L..83C
ADC_Keywords: Interstellar medium ; Radio lines ; Stars, carbon Keywords: circumstellar matter - ISM: molecules - radio lines: ISM - stars: AGB and post-AGB - stars: individual (IRC+10216) Abstract: We report the detection in the envelope of the C-rich star IRC+10216 of four series of lines with harmonically related frequencies: B1389, B1390, B1394, and B1401. The four series must arise from linear molecules with mass and size close to those of C6H and C5N. Three of the series have half-integer rotational quantum numbers; we assign them to the 2Δ and 2Σ- vibronic states of C6H in its lowest (ν11) bending mode. The fourth series, B1389, has integer J with no evidence of fine or hyperfine structure; it has a rotational constant of 1388.860(2)MHz and a centrifugal distortion constant of 33(1)Hz; it is almost certainly the C5N- anion. Description: The astronomical observations presented here are mainly from a spectral line survey of IRC+10216 done with the IRAM 30m telescope between 1995 and 2008 (Cernicharo et al. 2000, Cat. J/A+AS/142/181; J. Cernicharo et al. 2008, in preparation). Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 09 47 57.4 +13 16 44 IRC+10216 = V* CW Leo ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 71 54 Observed line parameters in IRC+10216
See also: J/A+AS/142/181 : 2mm molecular line survey of IRC+10 216 (Cernicharo+, 2000) J/ApJS/177/275 : 1.3 and 2mm survey of IRC+10216 (He+, 2008) J/ApJS/190/348 : 1mm spectral survey of IRC+10216 + VY CMa (Tenenbaum+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Line Line identification (1) 18- 28 A11 --- Trans Transition 30- 37 F8.1 MHz Freq Observed frequency 39- 41 F3.1 MHz e_Freq The 1σ uncertainty in Freq 43- 50 F8.1 MHz CFreq Calculated frequency 52- 55 F4.2 Temp Integrated antenna temperature (2) 57- 60 F4.2 e_Temp The 1σ uncertainty in Temp 62- 65 F4.1 km/s Vexp Line width parameter 67- 69 F3.1 km/s e_Vexp ? The 1σ uncertainty in Vexp 71 A1 --- f_Vexp [a] Indicates Vexp has been fixed
Note (1): Derived rotational constants following table 2: ------------------------------------------------------- Series B(MHz) D(Hz) Nlines J-Range ------------------------------------------------------- B1389 1388.860±0.002 33±1 13 8, 29-40 B1390 1389.878±0.007 -35±3 9 59/2-79/2 B1394 1394.609±0.010 32±4 22 29-41 B1401 1401.559±0.026 139±7 7 59/2-75/2 ------------------------------------------------------- See section 3 for further details. Note (2): Corrected for atmospheric absorption and rear spillover losses, by means of the ATM code (Cernicharo 1985, ATM: A Program to Compute Atmospheric Opacity between 0-1000GHz, IRAM Internal Report).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-Jan-2011
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