η Carinae - The outer ejecta
نویسندگان
چکیده
منابع مشابه
Lasers Operating in optical Fe II Lines in Stellar Ejecta of η Carinae
After the discovery of space masers based on OH radicals (Weaver et al., 1965) and H2O (Cheung et al., 1969) such microwave lasers have been found the effect of stimulated emission of radiation in the CO2 molecule has been discovered in the Martian and Venus' atmospheres (Betz et al., 1976; Mumma et al., 1981). We report here on the discovery of laser action in the range 0.9-2 µm in several spe...
متن کاملSubmillimetre emission from η Carinae
We present critical, long-wavelength observations of η Carinae in the submillimetre using SCUBA on the JCMT at 850 and 450 μm to confirm the presence of a large mass of warm dust around the central star. We fit a two-component blackbody to the IR-submm spectral energy distribution (SED) and estimate between 0.3− 0.7 M⊙ of dust exists in the nebula depending on the dust absorption properties and...
متن کاملThe periodicity of the η Carinae events ⋆ † ‡
Extensive spectral observations of η Carinae over the last cycle, and particularly around the 2003.5 low excitation event, have been obtained. The variability of both narrow and broad lines, when combined with data taken from two earlier cycles, reveal a common and well defined period. We have combined the cycle lengths derived from the many lines in the optical spectrum with those from broad-b...
متن کاملThe origin of the strings in the outer regions of η Carinae
The narrow optical filaments ('strings' or 'spikes') emerging from the Homunculus of η Carinae are modelled as resulting from the passage of ballistic 'bullets' of material through the dense circumstellar environment. In this explanation, the string is the decelerating flow of ablated gas from the bullet. An archive HST image and new forbidden line profiles of the most distinct of the strings a...
متن کاملThe porous atmosphere of η - Carinae Nir
We analyze the wind generated by the great 20 year long super-Eddington outburst of η-Carinae. We show that using classical stellar atmospheres and winds theory, it is impossible to construct a consistent wind model in which a sufficiently small amount of mass, like the one observed, is shed. One expects the super-Eddington luminosity to drive a thick wind with a mass loss rate substantially hi...
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ژورنال
عنوان ژورنال: Communications in Asteroseismology
سال: 2009
ISSN: 1021-2043,1021-2043
DOI: 10.1553/cia159s121