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Signatures of pulsations and mass loss in the spectra of post-AGB stars

Published online by Cambridge University Press:  30 August 2012

Laimons Začs ,
Julius Sperauskas ,
Aija Laure  and
Olesja Smirnova
Laimons Začs
Affiliation:
Faculty of Physics and Mathematics, University of Latvia, Raiņa bulvaris 19, LV-1586 Rıga, Latvia email: zacs@latnet.lv
Julius Sperauskas
Affiliation:
Vilnius University Observatory, Ciurlionio 29, Vilnius 2009, Lithuania email: julius.sperauskas@ff.vu.lt
Aija Laure
Affiliation:
Faculty of Physics and Mathematics, University of Latvia, Raiņa bulvaris 19, LV-1586 Rıga, Latvia email: zacs@latnet.lv
Olesja Smirnova
Affiliation:
Faculty of Physics and Mathematics, University of Latvia, Raiņa bulvaris 19, LV-1586 Rıga, Latvia email: zacs@latnet.lv
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Abstract

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The results of high-resolution spectroscopy and radial velocity monitoringa are presented for selected post-AGB candidate stars. Time series of high-resolution spectra for HD235858 shows spliting of low-excitation atomic lines and significant changes in the intensity of C2 and CN lines originated in the extended atmosphere significantly affected by pulsations and outflow. Mass ejection was confirmed for cool R CrB candidate stars DY Per, V1983 Cyg, and V2074 Cyg.

Keywords

Stars: AGB and post-AGBstars: oscillationsstars: windsoutflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 526 - 527
Copyright
Copyright © International Astronomical Union 2012

References

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Začs, L., Sperauskas, J., Musaev, F. A., Smirnova, O., Yang, T. C., Chen, W. P., & Schmidt, M. 2009, ApJ, 695, L203 CrossRefGoogle Scholar