Other
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.311..698s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 311, Issue 4, pp. 698-706.
Other
9
Stars: Emission-Line, Be, Stars: Individual: B416, Stars: Variables: Other, Galaxies: Individual: M33
Scientific paper
We report optical photometric and spectroscopic observations of the M33 star B416, establishing it as the fifth identified luminous blue variable (LBV) in that galaxy. The B magnitude of the star varies with a period of 8.26d and an amplitude of 0.03mag. 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. B416 is the first LBV with such oscillations that are strictly periodic and coherent over at least 10 years. The brightness of the star is also varying on a longer (years) time-scale, again mainly in its blue light. The spectrum has most of the characteristics of an LBV in quiescence, showing Balmer, Hei, Feii and [Feii] emission lines. The flux and profile of some of these lines are varying, but the scarcity of the observations prevents us from establishing their characteristic time-scale. B416 is at the centre of an Hii region, another indication of the relatively low age of this stellar system.
Leibowitz Elia M.
Shemmer Ohad
Szkody Paula
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