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Astron. Astrophys. 341, 224-232 (1999)

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Infrared spectroscopy of five short-period Miras and the peculiar Mira Z Ophiuchi

Thomas Lebzelter 1, Kenneth H. Hinkle 2, Josef Hron  1

1 Institute for Astronomy, Türkenschanzstrasse 17, A-1180 Vienna, Austria
2 Kitt Peak National Observatory, National Optical Astronomy Observatory *, 950 N.Cherry Avenue, P.O. Box 26732, Tucson, AZ 85726, USA

Received 8 July 1998 / Accepted 7 October 1998


Time-series 2.0-2.5 µm infrared spectra have been observed for Miras with periods less than 200 days. Some of these stars are high velocity and metal poor. We have also observed the peculiar, possibly metal-poor Mira, Z Oph. Velocities, excitation temperatures, and 12 C/13 C have been determined for these stars. These results are compared with similar data for bright, field Miras. We find Z Oph to be a metal-poor Mira of very low mass-loss rate. All Miras regardless of period, metallicity, or chemical abundance have the same pulsation velocity amplitude. The mode of pulsation is discussed.

Key words: stars: individual: Z Oph – stars: oscillations – stars: AGB and post-AGB – infrared: stars

* Operated by the Association of Universities for Research in Astronomy, Inc. under cooperative agreement with the National Science Foundation

Send offprint requests to: LEBZELTER@astro.ast.univie.ac.at

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© European Southern Observatory (ESO) 1999

Online publication: November 26, 1998