We present two new luminous blue variable ( LBV ) candidate stars discovered in the M 33 galaxy .
We identified these stars ( Valeev et al . ( 1 ) ) as massive star candidates at the final stages of evolution , presumably with a notable interstellar extinction .
The candidates were selected from the Massey et al .
catalog ( 2 ) based on the following criteria : emission in H \alpha , V < 18 . ^ { m } 5 and 0 \hbox { $ . ^ { m } $ } 35 < ( B - V ) < 1 \hbox { $ . ^ { m } $ } 2 .
The spectra of both stars reveal a broad and strong H \alpha emission with extended wings ( 770 and 1000 km s ^ { -1 } ) .
Based on the spectra we estimated the main parameters of the stars .
Object N 45901 has a bolometric luminosity \log ( L/L _ { \hbox { $ \odot$ } } ) = 6.0 – 6.2 with the value of interstellar extinction A _ { V } = 2.3 \pm 0.1 .
The temperature of the star ’ s photosphere is estimated as T _ { \star } \sim 13000 - 15000 K , its probable mass on the Zero Age Main Sequence is M \sim 60–80 M _ { \hbox { $ \odot$ } } .
The infrared excess in N 45901 corresponds to the emission of warm dust with the temperature T _ { \mbox { warm } } \sim 1000 K , and amounts to 0.1 % of the bolometric luminosity .
A comparison of stellar magnitude estimates from different catalogs points to the probable variability of the object N 45901 .
Bolometric luminosity of the second object , N 125093 , is \log ( L/L _ { \hbox { $ \odot$ } } ) = 6.3 – 6.6 , the value of interstellar extinction is A _ { V } = 2.75 \pm 0.15 .
We estimate its photosphere ’ s temperature as T _ { \star } \sim 13000 - 16000 K , the initial mass as M \sim 90-120 M \odot .
The infrared excess in N 125093 amounts to 5–6 % of the bolometric luminosity .
Its spectral energy distribution reveals two thermal components with the temperatures T _ { \mbox { warm } } \sim 1000 K and T _ { \mbox { cold } } \sim 480 K. The [ Ca II ] \lambda \lambda 7291 , 7323 lines , observed in LBV-like stars Var A and N 93351 in M 33 are also present in the spectrum of N 125093 .
These lines indicate relatively recent gas eruptions and dust activity linked with them .
High bolometric luminosity of these stars and broad H \alpha emissions allow classifying the studied objects as LBV candidates .