Milliarcsecond-resolution observations of M giants in the near-infrared by lunar occultations

Astronomy and Astrophysics – Astronomy

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Occultations, Moon, Circumstellar Matter, Stars: Fundamental Parameters, Stars: Late-Type, Infrared: Stars

Scientific paper

Near-infrared lunar occultation observations of six M giants, namely IRC+20190, NSV 1529, IRC+00198, BQ Ori, IRC+10194 and IRC+10024, in the spectral range M2-M7 are reported. Among these, four giants (NSV 1529, BQ Ori, IRC+10194 and IRC+10024) are resolved from our observations carried out at 2.2mum, resulting in accurate estimations of the angular size and the stellar effective temperature of these sources. The peculiarity of IRC+10194 and the problem of its real effective temperature are discussed. Upper limits on the stellar angular size for the other two giants have been derived.

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