Two new LBV candidates in the M 33 galaxy

Periodic Microvariation of B 416 , a New LBV in M 33

We report optical photometric and spectroscopic observations of the M33 star B416, establishing it as the fifth identified LBV in that galaxy. The B magnitude of the star varies with a period of 8. 26 and an amplitude of 0.03 magnitude. The red end of the optical spectrum does not seem to partake in these oscillations, which we identify as the microvariations, known to persist in LBV stars. B41...

Galaxy M 33 : A Geometric Distance

We report on the results of a 14 year long VLBI study of proper motions in the IC 133 H 2 O maser source in the galaxy M33. The method of Ordered Motion Parallax was used to model the 3-dimensional structure and dynamics of IC 133 and obtain a distance estimate, 800 ± 180 kpc. Our technique for determining the distance to M33 is independent of calibrations common to other distance indicators, s...

XMM - Newton survey of the Local Group galaxy M 33 ⋆

In an XMM-Newton raster observation of the bright Local Group spiral galaxy M 33 we study the population of X-ray sources (X-ray binaries, supernova remnants) down to a 0.2–4.5 keV luminosity of 10 35 erg s −1 – more than a factor of 10 deeper than earlier ROSAT observations. EPIC hardness ratios and optical and radio information are used to distinguish between different source classes. The sur...

O-33: Serum Anti-M

Photometric variability of LBV - candidate stars and Hubble - Sandage variables A , B , C and 2 in M 33

We present the photometric history of some Luminous Blue Variable candidate stars in M 33. The search for outbursts was made in photographic plates taken in the B band of the galaxy M 33 and cover an eight year period, 1982–1990. Twenty five plates, separated into seven groups, have been used. CCD UBV magnitudes of the star UIT003 are presented also. Only one (of 12) of the LBV candidates (UIT0...