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J/A+A/310/893       C2 Phillips and CN Red bands in HD 56126 (Bakker+, 1996)

Detection of C2, CN, and NaID absorption in the AGB remnant of HD 56126 Bakker E.J., Waters L.B.F.M., Lamers H.J.G.L.M., Trams N.R., van der Wolf F.L.A. <Astron. Astrophys. 310, 893 (1996)> =1996A&A...310..893B (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Equivalent widths Keywords: molecular processes - circumstellar matter - stars: individual: HD 56126 - stars: AGB and post-AGB Description: We present the detection of molecular absorption lines in the optical spectrum of the post-AGB star HD 56126. The C2 Phillips A1{PI}u-X1{SIGMA}+g(1,0), (2,0), and (3,0); Swan d3{PI}g-a3{PI}u(0,0) and (1,0); and CN Red system A2{PI}-X2{SIGMA}+ (1,0), (2,0), (3,0), and (4,0) bands have been identified. From the identification of the molecular bands we find an expansion velocity of 8.5±0.6km/s independent of excitation condition or molecular specie. On the basis of the expansion velocity, rotational temperatures, and molecular column densities we argue that the line-forming region is the AGB remnant. This is in agreement with the expansion velocity derived from the CO lines. We find column densities of logNC2=15.3±0.3cm-2 and logNCN=15.5±0.3cm-2, and rotational temperatures of Trot=242±20K and Trot=24±5K respectively for C2 and CN. By studying molecular line absorption in optical spectra of post-AGB stars we have found a new tracer of the AGB remnant. From comparison with the results of CO and IR observations it is possible to obtain information on non-spherical behavior of the AGB remnant. Using different molecules with different excitation conditions it should be possible to study the AGB remnant as a function of the distance to the star, and thus as a function of the evolutionary status of the star on the AGB. Objects: ---------------------------------------------------------------------- RA (2000) DE Name ---------------------------------------------------------------------- 07 16 10.2 +09 59 48 HD 56126 ---------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table13 86 55 (1,0) C2 Phillips band table14 86 55 (2,0) C2 Phillips band table15 86 55 (3,0) C2 Phillips band table16 81 30 (1,0) CN Red band table17 81 31 (2,0) CN Red band table18 82 34 (3,0) CN Red band
Byte-by-byte Description of file: table13 table14 table15
Bytes Format Units Label Explanations
1- 5 A5 --- B(J'') Line identification 9- 17 F9.3 0.1nm LabLambda Laboratory wavelength in air 21- 28 F8.2 0.1nm ObsLambda ? Observed wavelength 33- 36 F4.1 0.1pm Wlambda ? Observed equivalent width 40- 44 F5.2 --- f(J'J'')10+4 Oscillator strength 49- 53 F5.1 10+12cm-2 N(J'') ? Column density 57- 86 A30 --- Rem Remarks
Byte-by-byte Description of file: table16 table17 table18
Bytes Format Units Label Explanations
1- 4 A4 --- B Line identification, branch name 10- 12 A3 --- J'' Rotational quantum number, total angular momentum including spin (1) 16 I1 --- N'' Rotational quantum number, total angular momentum excluding spin (1) 20- 27 F8.3 0.1nm LabLambda Laboratory wavelength of transition in air 31- 37 F7.2 0.1nm ObsLambda ? Observed wavelength 38 A1 --- n_ObsLambda b=blend, N=NO 39- 43 F5.1 0.1pm W ? Observed equivalent width 48- 53 F6.4 --- f(J'J'')10+4 Oscillator strength 55- 59 F5.1 10+12cm-2 N(N''J'') ? Column density 62- 81 A20 --- Rem Remarks
Note (1): Herzberg G., 1950 "Molecular spectra and molecular structure. I. Spectra of Diatomic molecules.", second edition. For CN, N''=J''±1/2

(End) Patricia Bauer [CDS] 23-Mar-1996
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