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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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table13 table14 table15 table16 table17 table18
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Query from: http://vizier.cds.unistra.fr/cgi-bin/VizieR?-source=J/A+A/310/893
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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:
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RA (2000) DE Name
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07 16 10.2 +09 59 48 HD 56126
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