L'-Band Interferometric Observations of Evolved Stars

Details L'-Band Interferometric Observations of Evolved Stars L'-Band Interferometric Observations of Evolved Stars

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aj....124.2821c&link_type=abstract

The Astronomical Journal, Volume 124, Issue 5, pp. 2821-2832.

Astronomy and Astrophysics

Astronomy

20

Stars: Agb And Post-Agb, Stars: Late-Type, Techniques: Interferometric

Scientific paper

Ten bright Miras, six semiregular variable giants, and two semiregular variable supergiants have been observed with the Infrared-Optical Telescope Array interferometer in the L' band (from 3.4 to 4.1 μm). Observations were carried out in 2000 March and November with the FLUOR/TISIS instrument, using optimized single-mode waveguides for optical recombination and a dedicated chopping system for accurate subtraction of slow thermal background drifts. Four of the sources (the Mira stars R Leo and R Cnc, α Ori, and RS Cnc) were observed in both runs. We report on visibility measurements and derive L' broadband uniform disk (UD) diameter best fits for all 18 stars in our sample. We also detect strong departures from UD models in some peculiar cases.

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