Observations of the Rosette nebula NGC 2237 at decametric wavelengths

Krymkin, V. V.

doi:10.1007/bf00637907

Cited by 13 publications

(7 citation statements)

References 20 publications

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“…Various observations lend supports to our ISSV model results. Our calculation also gives a shell mass of ∼ 1.55 × 10 4 M ⊙ , which falls within 10,000M ⊙ and 16,000M ⊙ as estimated by Menon (1962) and Krymkin (1978), respectively.…”

Section: Interstellar Bubblessupporting

confidence: 82%

“…Conventional estimates show that the thick nebular shell has a much large mass of around 10,000 − 16,000 solar masses (e.g. Menon 1962;Krymkin 1978). For a sound speed of ∼ 10 km s −1 , the Parker-Bondi radius of a central object of 2000M ⊙ is then ∼ 0.08 pc, which is again very small compared to the ∼ 6 pc central void in Rosette Nebula (e.g.…”

Section: Applications Of Issv Model Solutionsmentioning

confidence: 99%

“…Across such a contact discontinuity, the densities and temperatures can be different on both sides. Equations (31) and (28) also show that, while pressures balance across a contact discontinuity, the reduced density at ISSV edge α 0 is determined by the mass loss rateṀ and central wind radial velocity v w . Back into this steady central stellar wind of a tenuous plasma at a smaller radius, it is possible to develope a spherical reverse shock.…”

Section: Energetics and Pressure Balancementioning

confidence: 99%

“…We adopt the parameters based on estimates and numerical calculations (see Section 4.3). By expressions (30) and (31), the plasma pressure at the central wind front also scales as p w,f ront ∝ t −2 T w . By a contact discontinuity between the central wind front and the ISSV edge with a pressure balance p w,f ront = p 0 , our self-similar 'void' plus the steady central wind can sustain an ISSV evolution as long as the central stellar wind can be maintained.…”

Section: Energetics and Pressure Balancementioning

confidence: 99%

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Dynamic evolution model of isothermal voids and shocks

Lou

Zhai

2009

Astrophys Space Sci

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We explore self-similar hydrodynamic evolution of central voids embedded in an isothermal gas of spherical symmetry under the self-gravity. More specifically, we study voids expanding at constant radial speeds in an isothermal gas and construct all types of possible void solutions without or with shocks in surrounding envelopes. We examine properties of void boundaries and outer envelopes. Voids without shocks are all bounded by overdense shells and either inflows or outflows in the outer envelope may occur. These solutions, referred to as type X void solutions, are further divided into subtypes X I and X II according to their characteristic behaviours across the sonic critical line (SCL). Void solutions with shocks in envelopes are referred to as type Z voids and can have both dense and quasi-smooth edges. Asymptotically, outflows, breezes, inflows, accretions and static outer envelopes may all surround such type Z voids. Both cases of constant and varying temperatures across isothermal shock fronts are analyzed; they are referred to as types Z I and Z II void shock solutions. We apply the 'phase net matching procedure' to construct various self-similar void solutions. We also present analysis on void generation mechanisms and describe several astrophysical applications. By including self-gravity, gas pressure and shocks, our isothermal self-similar void (ISSV) model is adaptable to various astrophysical systems such as planetary nebulae, hot bubbles and superbubbles in the interstellar medium as well as supernova remnants.

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Section: Interstellar Bubblessupporting

confidence: 82%

Section: Applications Of Issv Model Solutionsmentioning

confidence: 99%

Section: Energetics and Pressure Balancementioning

confidence: 99%

Section: Energetics and Pressure Balancementioning

confidence: 99%

See 2 more Smart Citations

Dynamic evolution model of isothermal voids and shocks

Lou

Zhai

2009

Astrophys Space Sci

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“…At the beginning and end of each observation day, a calibration of the output power was performed with the aid of the etalon noise generator connected with distributed amplifiers placed in the field of the telescope array. The method of observations and calibrations of the continuum radio emission using the UTR-2 is described in detail by Krymkin (1978).…”

Section: Observations and Data Processingmentioning

confidence: 99%

Utr-2 Low Frequency Continuum Survey of the Northhen Sky. Part Ii

Vasilenko

Sidorchuk

2019

OAP

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The beginnings of decameter radio astronomy: pioneering works of Semen Ya. Braude and his followers in Ukraine

2007

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Key words techniques: low-frequency astronomy -instrumentation: interferometers -history and philosophy of astronomy -obituaries, biographies S.Ya. Braude (1911 was the well-known radio astronomer, one of the founders of low-frequency astronomical research in the world, in particular in the former Soviet Union. He began to work in this field of science in 1957, in Kharkiv city (Ukraine), from the design and manufacturing small decameter interferometer ID-1 and ID-2. Since that time Braude and his team have developed more sophisticated radio decameter telescopes as UTR-1 and UTR-2 (the largest in the world till now) as well as the first decameter VLBI network URAN. They have obtained some important pioneering results about low-frequency radio emission of objects in our Solar system, Galaxy and Metagalaxy by means of these telescopes. In this paper the key events of early history of decameter radio astronomy research in the former USSR are mentioned with emphasizing the role of S. Braude. For the period of 1957-1962, the quotations of Braude's Personal Diary (2003) are first laying open to the public. The most important results obtained by S.Ya. Braude and his followers as well as perspectives of decameter radio astronomy in Ukraine and in the world are highlighted briefly.

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Observations of the Rosette nebula NGC 2237 at decametric wavelengths

Cited by 13 publications

References 20 publications

Dynamic evolution model of isothermal voids and shocks

Dynamic evolution model of isothermal voids and shocks

Utr-2 Low Frequency Continuum Survey of the Northhen Sky. Part Ii

The beginnings of decameter radio astronomy: pioneering works of Semen Ya. Braude and his followers in Ukraine

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