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  2. Symbiotic binary - Wikipedia

    en.wikipedia.org/wiki/Symbiotic_binary

    They usually contain a white dwarf with a companion red giant. The cool giant star loses material via Roche lobe overflow or through its stellar wind, which flows onto the hot compact star, usually via an accretion disk. Symbiotic binaries are of particular interest to astronomers as they can be used to learn about stellar evolution.

  3. Bougainvillea spectabilis - Wikipedia

    en.wikipedia.org/wiki/Bougainvillea_spectabilis

    Bougainvillea spectabilis grows as a woody vine or shrub, reaching 15 to 40 feet (4.6 to 12.2 m) [4] [5] with heart-shaped leaves and thorny, pubescent stems. [5] The flowers are generally small, white, and inconspicuous, highlighted by several brightly colored modified leaves called bracts.

  4. White dwarf - Wikipedia

    en.wikipedia.org/wiki/White_dwarf

    The red dwarf spirals inwards towards the core and might merge with the core. If this does not happen and instead the common envelope is ejected, then the binary ends up in a close orbit, consisting of a white dwarf and a red dwarf. This type of binary is called a post-common envelope binary.

  5. Subdwarf - Wikipedia

    en.wikipedia.org/wiki/Subdwarf

    It has a mass of 84 to 87 M J, making VVV 1256−62B likely a red dwarf star. [14] The subdwarf Wolf 1130C (sdT8) is the companion of an old subdwarf-white dwarf binary, which is estimated to be older than 10 billion years. It has a mass of 44.9 M J, making it a brown dwarf.

  6. Type Ia supernova - Wikipedia

    en.wikipedia.org/wiki/Type_Ia_supernova

    The Type Ia supernova leaves no compact remnant, but the whole mass of the former white dwarf dissipates through space. The theory of this type of supernova is similar to that of novae, in which a white dwarf accretes matter more slowly and does not approach the Chandrasekhar limit. In the case of a nova, the infalling matter causes a hydrogen ...

  7. Nova - Wikipedia

    en.wikipedia.org/wiki/Nova

    Artist's conception of a white dwarf, right, accreting hydrogen from the Roche lobe of its larger companion star A nova (pl. novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star (hence the name "nova", Latin for "new") that slowly fades over weeks or months.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. van Maanen 2 - Wikipedia

    en.wikipedia.org/wiki/Van_Maanen_2

    The progenitor of this white dwarf had an estimated 2.6 solar masses and remained on the main sequence for about 900 million years. This gives the star an overall age of about 4.1 billion years. When this star left the main sequence, it expanded into a red giant that reached a maximum radius of 1,000 times the current radius of the Sun, or ...

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