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Comparative Analysis Miras/PPN

Published online by Cambridge University Press:  07 August 2017

D. Barthes ,
M.O. Mennessier ,
F. Gleizes  and
A. Lèbre
D. Barthes
Affiliation:
GRAAL, CNRS and Univ. Montpellier II, F 34095 Montpellier Cedex 5, France
M.O. Mennessier
Affiliation:
GRAAL, CNRS and Univ. Montpellier II, F 34095 Montpellier Cedex 5, France
F. Gleizes
Affiliation:
GRAAL, CNRS and Univ. Montpellier II, F 34095 Montpellier Cedex 5, France
A. Lèbre
Affiliation:
DASGAL, Obs. Paris–Meudon, F 92195 Meudon Principal Cedex, France

Extract

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The spectrum of R Sct, a star firstly classified as an RV Tau one and located in the highest part of the instability strip, indicates a Na ejected shell at about 1000 R∗ with an expansion velocity close to 50 km/s (Lèbre and Gillet, 1991). This confirms the post AGB character of this star as already mentionned by Jura (1986). So it is interesting to compare the R Sct with some “classical” RV Tauri (AC Her and U Mon) and some “exceptional” miras (R Cen, U CMi and R Nor) with light curves exhibiting a double maximum and with spectral types earlier than those of the other miras with similar periods.

Type
IV. Planetary Nebulae Connection: Evolution from the AGB
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 322
Copyright
Copyright © Kluwer 1993 

References

Jura, M., 1986, Ap. J., 309,732 CrossRefGoogle Scholar
Lèbre, A., Gillet, D., 1991 A&A, 251, 549 Google Scholar
Tuchman, Y., Lèbre, A., Mennessier, M.O., Yarri, A., A&A, to be submitted Google Scholar