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In 2007, R Coronae Borealis (R CrB) went into a historically deep and long decline. ... The evidence pointing toward a white dwarf merger or a final-helium-shell flash origin for R CrB is contradictory. ... Along with the fact that R CrB shows significant lithium in its atmosphere, this supports the final-helium-shell flash. However, the relatively high inferred mass of R CrB and its high fluorine abundance support a white dwarf merger. ...

Hideyuki Saio Simon Jeffery are exploring models for the evolution of stars formed by the merger of two white dwarfs. The attached movie provides a simulation of the major events involved in the merger process. ... An initial binary system consists of two white dwarfs of masses M 1 and M 2 (given) with an orbital period ( P ). ... We adopt a simple expression for the white dwarf radius as a function of mass (in solar units): . ... The merged star evolution is simulated by a quadratic expansion . ...

White Dwarfs . IP Pegasi: Spiral Star . ... Image of a white dwarf that has spiral arms of gas around it. The white dwarf is in a binary star system and the spiral arms are part of an accretion disk. ... A white dwarf(blue center star) has somehow thrown off gas to form the planetary nebula that surrounds the star. ... Astronomers believe that so much gas accumulated onto the star that the star just exploded causing the gas to form a ring around the white dwarf . White Dwarf Stars Cool . ...

... Red stars are cool, with temperatures of around 3,000 degrees Kelvin (K), while blue stars are hotter and can have temperatures over 30,000 degrees K. Our own lovely yellow Sun's temperature is a comforting 6,000 degrees K. Star Trails in Northern Skies . ... Aurora Astern . ... Well, probably not ... but it is the most active volcanic moon. Active volcanoes on Jupiter's moon Io were a surprise discovery of the Voyager missions of the late 1970s. Comet-like Clouds in the Cartwheel Galaxy . ...

ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... ATCA | ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... The Australia Telescope National Facility Colloquium . ... Binaries consisting of a magnetic white dwarf in near synchronous rotation . ... white dwarf planetary systems and present a simple model to predict radio flux . ...

Proposal Identification No.: P2534 Date Received: 2009-Sep-30 16:22:58 Technical Page Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Pulsars 2.5 Hours Searching for a radio pulsar around an extremely low-mass white dwarf Low-mass white dwarfs are the prototypical companions of highly recycled millisecond pulsars. ... This proposal requires coordination with GPS L3 at 1381 MHz. ...

... November 2, 1997 . White Dwarf Stars Cool . Credit: H. Richer ( UBC ), NASA . Explanation: Diminutive by stellar standards , white dwarf stars are also intensely hot ... but they are cooling. ... Here, researchers have discovered a large concentration of white dwarf stars (circled above). ... Studying how these stars cool could lead to a better understanding of their ages, of the age of their parent globular cluster, and even the age of our universe! ... About APOD > . ...

The stability of planetary systems after stellar mass loss : Prospects for White Dwarf planets and pollution Alexander James Mustill1*, Dimitri Veras2, Eva Villaver3, Amy Bonsor4, Boris GДnsicke2, Mark Wyatt 1 2 5 Lund Observatory ... 1TL, United Kingdom 5 Institute of Astronomy, University of Cambridge, Madingley Road, CB3 9ET, UK *alex@astro.lu.se Stars lose mass as they evolve to become white dwarfs ( WDs ), and this mass loss can induce ...

This artist's conception shows a binary star system that produces recurrent novae, and ultimately, the supernova PTF 11kx. A red giant star (foreground) loses some of its outer layers though a stellar wind, and some of it forms a disk around a companion white dwarf star. ... When the mass builds up to the near the ultimate limit a white dwarf star can take, it explodes as a type Ia supernova, destroying the white dwarf. ...

... Возьмите с собой книжку из новой серии "Смешарики - малышам". ... Артикул: 22-3552 Цвет: светло-розовый Состав: 100% полиэфир Описание: брюки прямого кроя, утепленные флисом Уход за изделием: машинная стирка при 30њС градусах, без отбеливания Страна дизайна: Россия Страна производства: Китай Товар сертифици