white dwarf tagged posts

This image, taken by the NASA/ESA Hubble Space Telescope, shows the colorful “last hurrah” of a star like our sun. Credit: NASA, ESA, and K. Noll (STScI), Acknowledgment: The Hubble Heritage Team (STScI/AURA)

This image by Hubble shows the colorful “last hurrah” of a star like our sun. The star is ending its life by casting off its outer layers of gas, which formed a cocoon around the star’s remaining core. Ultraviolet light from the dying star makes the material glow. The burned-out star ie white dwarf, is the white dot in the center. Our sun will eventually burn out and shroud itself with stellar debris, but not for another 5 billion years.

Our Milky Way Galaxy is littered with these stellar relics, ie planetary nebulae. The objects have nothing to do with planets...

This artist’s impression shows the strange object AR Scorpii. In this unique double star a rapidly spinning white dwarf star (right) powers electrons up to almost the speed of light. These high energy particles release blasts of radiation that lash the companion red dwarf star (left) and cause the entire system to pulse dramatically every 1.97 minutes with radiation ranging from the ultraviolet to radio. Credit: M. Garlick/University of Warwick, ESA/Hubble

Astronomers using Hubble along with other telescopes on the ground and in space, have discovered a new type of exotic binary star: in the system AR Scorpii a rapidly spinning white dwarf star is powering electrons up to almost the speed of light...

White dwarf (right) stripping mass from the brown dwarf. Credit: Rene Breton, University of Manchester.

Astronomers have detected a sub-stellar object that used to be a star, after being consumed by its white dwarf companion. An international team of astronomers made the discovery by observing a very faint binary system, J1433 730 light-years away. The system consists of a low-mass object – 60X the mass of Jupiter – in an extremely tight 78-min orbit around a white dwarf (the remnant of a star like our Sun).

Due to their close proximity, the white dwarf strips mass from its low-mass companion. This process has removed about 90% of the mass of the companion, turning it from a star into a brown dwarf...

Mu Centauri. Credit: Palomar Observatory/STScI/WikiSky

510 light years away, Mu Centauri is a very interesting dwarf nova, a close binary star system in which white dwarf accretes matter from its companion. Although little is know about Mu Centauri, we could observe temporal variations of its brightness and its flickering on a relatively low level. It was also found that this system’s light curve contains odd consistent modulations on 2 different periods.

Bruch used 0.6-m Zeiss and the 0.6-m Boller & Chivens telescopes of Observatorio do Pico dos Dias in Brazil. Photometric observations of its light curves were conducted on 6 nights in Feb, May, Jun 2015. The brightness of Mu Centauri was measured as magnitude difference with respect to several comparison stars in the field...