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- W2100090486 abstract "We discuss 24 y of optical photometry of Carinae, among which new Geneva photometry made between 1994 and 1998. Various conclusions from our previous photometric stud- ies are confirmed. The core hides a normal S Dor variable (or LBV): it shows light variations on a time scale of 1-4 y, with superimposed micro oscillations whose quasi-period indicates a temperature in order of 22 000 K. Therefore, a more compli- cated model for Car is necessary to explain its extraordinary appearance and phenomena exhibited in past and at present. An analysis of brightness of Car in ultraviolet (UV) passbands of three photometric systems (Walraven, Str ¨ omgren and Geneva) reveals presence of an important variable UV source, which appears to be modulated with 5.52 y period of spectroscopic events, related to possible revolution of an excentric binary of type proposed by Damineli et al. (1997). Our new data support luminous disk model suggested by van Genderen et al. (1994, 1995). A very hot companion of LBV would be responsible for excitation of disk. We suspect that flare-like event in X-ray flux and in optical and near-infrared light around 1998.0 was result of encounter of interface of colliding winds of binary with an arm-shaped density enhancement in a disk around LBV (not necessarily the luminous disk). We suppose that this encounter created an intense X-ray/hot spot region. The subsequent steep decline of flare is ascribed to an eclipse of X-ray/hot spot by wind interface. The radio flux variation of gas torus in equatorial plane at a distance of 2 00 from core, could be result of luminous disk becoming optically thin. This would, obviously, start abruptly near time of periastron passage and would last for a few years thereafter, so that a hot star, normally enshrouded by disk, is able to excite outer gas torus. The creation of X-ray/hot spot, with a life-time of at most a few months, could also be cause of instantanious physical change of" @default.
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- W2100090486 date "1999-03-01" @default.
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- W2100090486 title "Photometric behaviour of eta Carinae, a celestial Chinese lantern: 1974-1998" @default.
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