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No fundamental-mode pulsation in R Leonis ?

Tuthill, P. G.; Feast, M. W.; Haniff, C. A. +1 more

We present new and precise angular diameter measurements of the long-period variable R Leonis at 833 and 903 nm. Our inferred photospheric diameter (38±2.5 mas) and stellar effective temperature (2459 + 150 K) are both in good agreement with recent determinations made at the same variability phase in the near-infrared. Assuming a parallax of 8.3 m…

Classification of the HIPPARCOS Input Catalogue Using the Kohonen Network

Hernandez-Pajares, M.; Floris, J.

The unsupervised classification with respect to stellar populations of 106 000 of the 118 000 Hipparcos input catalogue stars is presented, in terms of angular position and velocity, apparent magnitude and spectral type. The classification is performed first by merging the real data with a small sample of synthetic stars, which are representative …