Multi-color interferometric observations of Mira stars - probing the extended atmosphere structure and chemistry

Details Multi-color interferometric observations of Mira stars - probing the extended atmosphere structure and chemistry Multi-color interferometric observations of Mira stars - probing the extended atmosphere structure and chemistry

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..131m&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

1

Mira Atmosphere, Infrared Interferometry

Scientific paper

Interferometric observations in the atmospheric windows of the near infrared (1 to 4 μm) can be efficiently used to probe the chemical composition of Miras atmosphere and provide direct measurements of extended gas layers around these stars. This is illustrated by recent Miras observations carried out with the FLUOR instrument of the IOTA interferometer (Mennesson et al. 2002, and Perrin et al. proceedings of this conference) and with the PTI test-bed (Thompson 2002, Thompson et al. 2002). These visibility measurements show evidence for continuum emission from very extended (2-3 stellar radii) semi-transparent gaseous atmospheric layers, and large apparent diameter changes with pulsation phase. Interestingly these observations are consistent with the extended molecular gas layers (H2O, CO...) already inferred around some of these objects from ISO and high resolution ground-based FTS infrared spectra.

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