The Nebula Round η Argus
نویسندگان
چکیده
منابع مشابه
The nature of strings in the nebula around η Carinae
η Carinae is one of the most extreme cases of a Luminous Blue Variable star. A bipolar nebula of 17′′ size surrounds the central object. Even further out, a large amount of filamentary material extends to a distance of 30′′ or about 0.3 pc. In this paper we present a detailed kinematic and morphological analysis of some outer filaments in this nebula which we call strings. All strings are extre...
متن کاملGiant Outbursts of Luminous Blue Variables and the Formation of the Homunculus Nebula Around η Carinae
The observed giant outbursts of Luminous Blue Variables (LBVs) may occur when these massive stars approach their Eddington limits. When this happens, they must reach a point where the centrifugal force and the radiative acceleration cancel out gravity at the equator. We call this the Ω-limit. When stars are close to the Ω-limit, strong non-spherical mass loss should occur. This suggests a scena...
متن کاملHigh velocity structures in , and the X - ray emission from the LBV nebula around η Carinae
The Luminous Blue Variable star η Carinae is one of the most massive stars known. It underwent a giant eruption in 1843 in which the Homunculus nebula was created. ROSAT and ASCA data indicate the existence of a hard and a soft X-ray component which appear to be spatially distinct: a softer diffuse shell of the nebula around η Carinae and a harder point-like source centered on the star η Car. A...
متن کاملHigh resolution near - infrared polarimetry of η Carinae and the Homunculus Nebula
High resolution near-infrared adaptive optics imaging and polarimetry have been obtained of the Homunculus Nebula and its central illuminating star η Carinae (HD 93308). Images and maps of the linear polarization at a resolution of <0.2′′ have been made in the J, H and K bands and in a narrow 2.15 μm continuum band (Kc). The overall appearance of the nebula in the near-IR is similar in all band...
متن کاملThe decay η ′ c → η
The decay η ′ c → η c π π. Abstract It is pointed out that the decay of the recently observed charmonium η ′ c resonance, η ′ c → η c π π is simply related to the well studied decay ψ ′ → J/ψ π π and can thus be used for absolute normalization of other decay modes of the η ′ c. The total rate of the discussed decay should be approximately three to four times the corresponding rate for the ψ ′ r...
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ژورنال
عنوان ژورنال: Nature
سال: 1872
ISSN: 0028-0836,1476-4687
DOI: 10.1038/006008b0