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

Autor(en)

Thomas Lebzelter, Kenneth H. Hinkle, Josef Hron

Abstrakt

Time-series 2.0-2.5 œm 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 12C/13C 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.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

National Optical Astronomy Observatory, Tucson

Journal

Astronomy & Astrophysics

Band

341

Seiten

224-232

Anzahl der Seiten

9

ISSN

0004-6361

Publikationsdatum

1999

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/infrared-spectroscopy-of-five-shortperiod-miras-and-the-peculiar-mira-z-ophiuchi(30b028ae-e4ce-4171-b8a2-ea164370e492).html