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The INAF ASTRI Project in the framework of CTA
N. La Palombara, P. Caraveo, M. Fiorini +9
The ASTRI project aims to develop, in the framework of the Cherenkov Telescope Array, an end-to-end prototype of the small-size telescope, devoted to the investigation of the energ…
The mysterious sdO X-ray binary BD+37 442
U. Heber, S. Geier, A. Irrgang +4
Pulsed X-ray emission in the luminous, helium-rich sdO BD+37 442 has recently been discovered (La Palombara et al., 2012). It was suggested that the sdO star has a neutron star or…
Three new X-ray emitting sdO stars discovered with Chandra
N. La Palombara, P. Esposito, S. Mereghetti +1
X-ray observations of sdO stars are a useful tool to investigate their properties, but so far only two sdO stars were detected at X-rays. We observed a complete flux-limited sample…
Constraints on the winds of hot subdwarf stars from X-ray observations of two sdB binaries with compact companions: CD -30 11223 and PG 1232-136
S. Mereghetti, N. La Palombara, P. Esposito +5
Little observational data are available on the weak stellar winds of hot subdwarf stars of B spectral type (sdB). Close binary systems composed of an sdB star and a compact object…