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Lines of Circumstellar C2, CN, and CH+ in the Optical Spectra of Post-AGB Stars

Published online by Cambridge University Press:  25 May 2016

Eric J. Barker ,
David L. Lambert  and
Ewine F. Van Dishoeck
Eric J. Barker
Affiliation:
Department of Astronomy and McDonald Observatory, University of Texas, Austin TX, U.S.A.
David L. Lambert
Affiliation:
Department of Astronomy and McDonald Observatory, University of Texas, Austin TX, U.S.A.
Ewine F. Van Dishoeck
Affiliation:
Leiden Observatory, University of Leiden, The Netherlands

Abstract

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Recent optical spectra of post-AGB stars show the presence of C2, CN, and CH+ originating in the circumstellar shell. We present here new, higher resolution spectra which provide constraints on the physical parameters and information on the line profiles. An empirical curve of growth for the C2 Phillips and CN Red system lines in the spectrum of HD 56126 yields b = 0.050+0.59−0.23 km s−1. CH+ (0,0) emission lines in the spectrum of the Red Rectangle have been resolved with a FWHM ≈ 8.5± 0.8 km s−1. The circumstellar CN lines of IRAS 08005-2356 are resolved into two separate components with a velocity separation of Δv = 5.7 ± 2.0 km s−1. The line profiles of CN of HD 235858 have not been resolved.

Type
Session V — Post-AGB Stars
Information
Symposium - International Astronomical Union , Volume 177: The Carbon Star Phenomenon , 2000 , pp. 217 - 224
Copyright
Copyright © Kluwer 2000 

References

Bakker, E. J., Waters, L.B.F.M., Lamers, H.J.G.L.M., Trams, N. R. & Van der Wolf, F.L.A. 1996, A&A, 310, 893 Google Scholar
Bakker, E. J., van Dishoeck, E. F., Waters, L.B.F.M. & Schoenmaker, T. 1997, A&A, 323, 469 Google Scholar
Hrivnak, B. J. 1995, ApJ, 438, 341 Google Scholar
Jura, M., Balm, S. P. & Kahane, C. 1995, ApJ, 453, 721 CrossRefGoogle Scholar
Jura, M., Turner, J. & Balm, S. P. 1997, ApJ, 474, 741 Google Scholar
Smith, V. V. & Lambert, D. L. 1990, ApJ Supp., 72, 387 Google Scholar
van Dishoeck, E. F. & Black, J. H. 1982, ApJ, 258, 533 Google Scholar
Začs, L., Klochkova, V. G. & Panchuk, V. E. 1995, MNRAS, 275, 764 Google Scholar