Tag: MHD

Heating and emission in the accreting material onto young stars. The study: “Effects of radiation in accretion regions of classical T Tauri stars. Pre-heating of accretion column in non-LTE regime” of S. Colombo (UNIPA/OAPA/LERMA) recently appeared on A&A

Ricerca

Pre-Main Sequence stars are young (few million years) stars whose nuclei are not powered yet by the thermonuclear reactions, and that may still accrete gas from a surrounding disk (called protoplanetary or accretion disks). Even if the accretion disks are typically extended more than 100 Astronomical Units (AU, the mean distance between Earth and the Sun, equal to 150 million

» Read more
, , ,

31 years of evolution of a supernova remnant. The study: “3D MHD modeling of the expanding remnant of SN 1987A. Role of magnetic field and non-thermal radio emission” of S. Orlando (INAF-OAPA) recently published by A&A

Ricerca

During the 1987 February 23rd night, astronomers observed the explosion of a supernova in the Large Magellanic Cloud, a satellite galaxy of the Milky Way. The exploded star was the blue supergiant Sanduleak (Sk) − 69o202, with a mass of 20 solar masses, and its explosion produced the supernova remnant SN 1987A. From that moment, SN 1987A was observed with

» Read more
, , , ,

Pubblicato su Astronomy & Astrophysics “Accretion disk coronae of intermediate polar cataclysmic variables” di Enrico Barbera

Ricerca

Il fatto che il Sole sia circondato da un’atmosfera tenue ma incredibilmente calda (con gas tipicamente a 1-2 milioni di gradi), chiamata corona, è una scoperta risalente agli anni quaranta. Ovviamente la corona non è una caratteristica peculiare del nostro Sole, ma una regione la cui emissione è osservata quasi in ogni tipo di stella.   L’articolo “Accretion disk coronae

» Read more
, , ,
1 2