Variable C – “a typical” LBV in M 33?

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...

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...

A Large - Scale Survey for Variable Stars in M 33

We have started a survey of M 33 in order to find variable stars and Cepheids in particular. We have obtained more than 30 epochs of g′r′i′ data with the CFHT and the one-square-degree camera MegaCam. We present first results from this survey, including the search for variable objects and a basic characterization of the various groups of variable stars.

O-33: Serum Anti-M

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...