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J/A+A/310/893       C_2_ Phillips and CN Red bands in HD 56126 (Bakker+, 1996)
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Detection of C_2_, 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)
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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 C_2_ Phillips
    A^1^{PI}_u_-X^1^{SIGMA}^+^_g_(1,0), (2,0), and (3,0); Swan
    d^3^{PI}_g_-a^3^{PI}_u_(0,0) and (1,0); and CN Red system
    A^2^{PI}-X^2^{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 logN_C_2__=15.3+/-0.3cm^-2^ and
    logN_CN_=15.5+/-0.3cm^-2^, and rotational temperatures of
    T_rot_=242+/-20K and T_rot_=24+/-5K respectively for C_2_ 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
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     07 16 10.2  +09 59 48    HD 56126
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File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table13            84       55   (1,0) C_2_ Phillips band
table14            83       55   (2,0) C_2_ Phillips band
table15            82       55   (3,0) C_2_ Phillips band
table16            72       30   (1,0) CN Red band
table17            77       31   (2,0) CN Red band
table18            82       34   (3,0) CN Red band
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Byte-by-byte Description of file: table13 table14 table15
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   Bytes Format  Units   Label         Explanations
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   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
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Byte-by-byte Description of file: table16 table17 table18
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   Bytes Format  Units   Label        Explanations
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   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
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Note (1): Herzberg G., 1950 "Molecular spectra and molecular structure. I.
           Spectra of Diatomic molecules.", second edition.
          For CN, N''=J''+/-1/2
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(End)                                         Patricia Bauer [CDS]   23-Mar-1996