Angular diameter measurements of evolved variables by lunar occultations at 2.2 and 3.8 micron

Details Angular diameter measurements of evolved variables by lunar occultations at 2.2 and 3.8 micron Angular diameter measurements of evolved variables by lunar occultations at 2.2 and 3.8 micron

2005-04-14

arxiv.org/abs/astro-ph/0504326v1

Astron.J.130:842-852,2005

Astronomy and Astrophysics

Astrophysics

31 pages. Accepted in The Astronomical Journal, 2005

Scientific paper

10.1086/430457

We report the angular diameters of two Mira variables (U Ari and Z Sco), three semiregular (SR) and irregular variables (SW Vir, eta Gem and mu Gem) and a supergiant SR variable (TV Gem) by lunar occultation observations in the near-IR broad K-band (2.2 micron). Lunar occultations of eta Gem and mu Gem were also observed for the first time simultaneously in both the K and L' bands, yielding angular diameters at 2.2 and 3.8 micron. Effective temperatures and linear radii are also derived for all the observed sources and compared with earlier measurements. The mode of pulsation of both Mira and SR sources in our sample is discussed.

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