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  2. List of white dwarfs - Wikipedia

    en.wikipedia.org/wiki/List_of_white_dwarfs

    Sirius B: 1852 Sirius system Sirius B is also the nearest white dwarf (as of 2005) [1] [2] First found in a binary star system First double white dwarf system LDS 275: 1944 L 462-56 system [3] First solitary white dwarf Van Maanen 2: 1917 Van Maanen's star is also the nearest solitary white dwarf [4] First white dwarf with a planet WD B1620− ...

  3. White dwarf - Wikipedia

    en.wikipedia.org/wiki/White_dwarf

    Sirius B, which is a white dwarf, can be seen as a faint point of light to the lower left of the much brighter Sirius A. A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: its mass is comparable to the Sun's and its volume Earth's.

  4. List of star extremes - Wikipedia

    en.wikipedia.org/wiki/List_of_star_extremes

    Nearest white dwarf: Sirius B: 1852 8.6 light-years (2.6 pc) Sirius B is also the second white dwarf discovered, after 40 Eridani B. [9] [25] [26] Nearest brown dwarf: Luhman 16: 2013 6.5 light-years (2.0 pc) This is a pair of brown dwarfs in a binary system, with no other stars. [27] Nearest Luminous Blue Variable: P Cygni: 5,251 light-years ...

  5. List of smallest known stars - Wikipedia

    en.wikipedia.org/wiki/List_of_smallest_known_stars

    White dwarf: HD 49798: 0.0023 0.023 0.25 1,600 km (990 mi) 2021 White dwarfs are stellar remnants produced when a star with around 8 solar masses or less sheds its outer layers into a planetary nebula. The leftover core becomes the white dwarf. It is thought that white dwarfs cool down over quadrillions of years to produce a black dwarf. [15]

  6. List of nearest stars by spectral type - Wikipedia

    en.wikipedia.org/wiki/List_of_nearest_stars_by...

    Brightest red dwarf in the sky. List of nearest K-type stars. Alpha Centauri B is the closest K-type star to the Earth. ... Sirius A 8.6 ± 0.04: A0mA1Va [107] 1. ...

  7. Sirius - Wikipedia

    en.wikipedia.org/wiki/Sirius

    Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. The distance between the two varies between 8.2 and 31.5 astronomical units as they orbit every 50 years.

  8. A-type main-sequence star - Wikipedia

    en.wikipedia.org/wiki/A-type_main-sequence_star

    The revised Yerkes Atlas system [7] listed a dense grid of A-type dwarf spectral standard stars, but not all of these have survived to this day as standards. The "anchor points" and "dagger standards" of the MK spectral classification system among the A-type main-sequence dwarf stars, i.e. those standard stars that have remained unchanged over years and can be considered to define the system ...

  9. File:Sirius A & B X-ray.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Sirius_A_&_B_X-ray.jpg

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