Variables stars in Kappa-crucis

ORSATTI, A.M.; VERGNE, M. M.; FEINSTEIN, C.; MARTÍNEZ, R.

San Juan

Congreso; 51 Reunion Anual de la AAA; 2008

Asociación Argentina de Astronomía

We present a polarimetric study of Beta Cep stars located in the open cluster NGC 4755, also known as Kappa Crucis. These are pulsating stars of spectral types O-B2 V-III, with very short periods (3 to 6 hours) and small amplitudes (0.1 to 20 solar mass), located along a narrow band in the HR diagram. where it can be found other objects ending with the Hydrogen burn in their core. Many of them pulse in a non-radial way. The polarimetric observations in the bands UBVRI were obtained with the Torino Fotopolarimeter and the Jorge Sahade 2.15 m telescope at CASLEO (San Juan, Argentina).