Time-dependent Asymmetries in the Atmosphere of the Mira Variable R Trianguli through Infrared Interferometry

Details Time-dependent Asymmetries in the Atmosphere of the Mira Variable R Trianguli through Infrared Interferometry Time-dependent Asymmetries in the Atmosphere of the Mira Variable R Trianguli through Infrared Interferometry

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...570..373t&link_type=abstract

The Astrophysical Journal, Volume 570, Issue 1, pp. 373-378.

Astronomy and Astrophysics

Astronomy

24

Infrared: Stars, Stars: Agb And Post-Agb, Stars: Atmospheres, Stars: Fundamental Parameters, Stars: Individual: Constellation Name: R Trianguli, Techniques: Interferometric

Scientific paper

We report high-resolution (<0.05 mas) angular size measurements of the Mira variable star R Tri using the Palomar Testbed Interferometer. Observations were conducted in the K band (2.0-2.4 μm) between the visual phases of 0.77 and 0.88, and one period later at phase 0.91. The spatial coverage of the measurements spans 40° in position angle. Three simple geometries were modeled: a uniform ellipse model and a uniform sphere with a brighter ``disk'' model have lower χ2μ than the uniform spherical disk model by factors of 5-10. For the axially symmetric models, the axis of symmetry is clustered between 20° and 35°. The position angles are roughly perpendicular to visual polarization position angles, which supports an axially symmetric source of light scattering. For the elliptical geometry, averaging the semimajor and semiminor axes throughout the data set yields an ensemble average angular diameter of 5.22+/-0.30 mas; the ensemble average axial ratio of 2a/2b=0.75 is similar to that previously determined for other Mira and semiregular variable stars.

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