Spectrophotometric observations and evolutionary status of ten Be stars

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The continuum energy distribution data of ten Be stars — namely, HR 1761, HR 1786, HR 1820, σOri, ωOri, OT Gem, βLyr, HR 7983, νCyg, and 59 Cyg — have been presented in the wavelength range λλ3200–8000 A. The observed energy distribution curve shows near infrared excess for majority of Be stars and a double Balmer jump for HR 8047 and HR 8146. Empirical effective temperatures of these stars have been estimated by comparing the observed continuum energy distributions with that of computed theoretical models given by Kurucz (1979). On the basis of an HR diagram with evolutionary tracks for different solar masses the masses of these Be stars have been estimated. Position of these studied stars on the HR diagram suggests that these Be stars may be in the stage of core contraction after exhausting hydrogen at the centre and have undergone hydrogen exhaustion in the thick shell.