J/ApJS/211/5 Improved line data for the Swan system 12C13C (Ram+, 2014)
Improved line data for the Swan system 12C13C isotopologue.
Ram R.S., Brooke J.S.A., Bernath P.F., Sneden C., Lucatello S.
<Astrophys. J. Suppl. Ser., 211, 5 (2014)>
=2014ApJS..211....5R 2014ApJS..211....5R
ADC_Keywords: Atomic physics ; Line Profiles ; Spectroscopy
Keywords: line: identification; molecular data; stars: abundances;
stars: carbon; stars: individual (Arcturus)
Abstract:
We present new, accurate predictions for rotational line positions,
excitation energies, and transition probabilities of the 12C13C
isotopologue Swan d3Π-a3Π system 0-0, 0-1, 0-2, 1-0, 1-1,
1-2, 2-0, 2-1, and 2-2 vibrational bands. The line positions and
energy levels were predicted through new analyses of published
laboratory data for the 12C13C lines. Transition probabilities
were derived from recent computations of transition dipole moments and
related quantities. The 12C13C line data were combined with
similar data for 12C2, reported in a companion paper
(2013JQSRT.124...11B 2013JQSRT.124...11B), and applied to produce synthetic spectra of
carbon-rich metal-poor stars that have strong C2 Swan bands. The
matches between synthesized and observed spectra were used to estimate
band head positions for a few of the 12C13C vibrational bands and
to verify that the new computed line data match observed spectra. The
much weaker C2 lines of the bright red giant Arcturus were also
synthesized in the band head regions.
Description:
The present work has been undertaken to predict more precise line
positions of the 12C13C Swan system based on spectroscopic
constants from the Fourier transform spectrometer (FTS) measurements
determined by Amiot (1983ApJS...52..329A 1983ApJS...52..329A), Amiot & Verges
(1982ApJ...263..993A 1982ApJ...263..993A) and Islami & Amiot (1986JMoSp.118..132I 1986JMoSp.118..132I). The
spectroscopic constants for v=1 and 2 in the d3Π state were
estimated using accurate v=0 constants and 12C13C equilibrium
constants, which were estimated from the equilibrium constants of the
12C2 Swan system (Brooke et al. 2013JQSRT.124...11B 2013JQSRT.124...11B) and isotopic
relationships.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 92 28872 Assignments, wavenumbers, excitation energies,
and transition probabilities of individual
12C13C transitions
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See also:
J/ApJS/210/23 : Line intensities of CN transitions (Brooke+, 2014)
J/ApJS/207/26 : MgH in the A2Π-X2Σ+ system (Hinkle+, 2013)
J/ApJ/747/102 : 12C/13C ratio for 18 galactic R CrB stars (Hema+, 2012)
J/ApJS/194/34 : FT emission spectroscopy of 13C14N (Ram+, 2011)
J/ApJS/182/80 : Rare earth abundances (Sneden+, 2009)
J/ApJS/169/472 : Swan system of C2 (Tanabashi+, 2007)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1 I1 --- v' [0/2] Upper state vibrational quantum number
3 I1 --- v'' [0/2] Lower state vibrational quantum number
5- 6 I2 --- J' [0/60] Upper state rotational quantum number
8- 9 I2 --- J'' [0/61] Lower state rotational quantum number
11 I1 --- F' [1/3] Upper state spin component
13 I1 --- F'' [1/3] Lower state spin component
15 A1 --- p' [ef] Upper state parity
17 A1 --- p'' [ef] Lower state parity
19- 27 F9.3 cm-1 nuO [19354/19842]? Observed wavenumber of line
position
29- 38 F10.4 cm-1 nuC [16068/23615] Calculated wavenumber of line
position
40- 46 F7.4 cm-1 O-C ? Observed-calculated line position wavenumbers
48- 56 F9.4 cm-1 E'' Lower state energy level
58- 69 E12.6 s-1 A Transition probability
71- 82 E12.6 --- f Oscillator strength
84- 92 A9 --- Trans Molecular transition description
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Apr-2014