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nova

A nova (plural novae or novas) or classical nova (CN or plural CNe) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star, that slowly fades over several weeks or many months. Novae involve an interaction between two stars that cause the flareup that is perceived as a new entity that is much brighter than the stars involved.
Causes of the dramatic appearance of a nova vary, depending on the circumstances of the two progenitor stars. All novae involve closely located binary stars (the progenitors), either a pair of red dwarfs in the process of merging, or a white dwarf and another star.
The main sub-classes of novae are classical novae, recurrent novae (RNe), and dwarf novae. They are all considered to be cataclysmic variable stars. Luminous red novae share the name and are also cataclysmic variables, but are a different type of event caused by a stellar merger. Also with similar names are the much more energetic supernovae (SNe) and kilonovae.
Classical nova eruptions are the most common type of nova. They are likely created in a close binary star system consisting of a white dwarf and either a main sequence, sub-giant, or red giant star. When the orbital period falls in the range of several days to one day, the white dwarf is close enough to its companion star to start drawing accreted matter onto the surface of the white dwarf, which creates a dense, but thin, atmosphere. This atmosphere is mostly hydrogen and is thermally heated by the hot white dwarf, which eventually reaches a critical temperature causing rapid runaway ignition by fusion.
From the dramatic and sudden energies created, the now hydrogen-burnt atmosphere is then dramatically expelled into interstellar space, and its brightened envelope is seen as the visible light created from the nova event, and previously was mistaken as a "new" star. A few novae produce short-lived nova remnants, lasting for perhaps several centuries. Recurrent nova processes are the same as the classical nova, except that the fusion ignition may be repetitive because the companion star can again feed the dense atmosphere of the white dwarf.
Novae most often occur in the sky along the path of the Milky Way, especially near the observed galactic centre in Sagittarius; however, they can appear anywhere in the sky. They occur far more frequently than galactic supernovae, averaging about ten per year. Most are found telescopically, perhaps only one every year to eighteen months reaching naked-eye visibility. Novae reaching first or second magnitude occur only several times per century. The last bright nova was V1369 Centauri reaching 3.3 magnitude on 14 December 2013.

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  1. J

    WTS OTHER  .22 Cal Nova Freedom

    Nova Freedom .22 Cal Need Air??? No problem This multi pump PCP lets you leave the air tank behind. Fire up to 17 shots with 40-60 pumps or fill with probe. Features a fully patented high efficiency chamber design that allows the user to fire up ton17 shots at 900 fps or greater after only 40 to...
  2. NWCustomFirearms

    WTS/WTT WA  1975 Nova

    Seriously tired of flakes, no more flakes please, if you make me an offer that I accept, please follow through :rolleyes: I have a 1975 nova, with title, that is now a parts car. Engine was turning 6 months ago but is not now. Might be able to break free, don't know and don't have time. Asking...
  3. badam870

    Benelli super nova

    Only 20 rounds through it! Just looking for a pistol, prefer a Glock 9mm But open to others... pm me
  4. winchester270

    WTB OR  870 or benelli Nova

    Im in search of a pre 2007 remington 870. in 12 guage 3.5 inch chamber. Looking for a waterfowl hunting shotgun. tactical shotguns are cool but not what I am looking for right now.
  5. F

    Benelli Nova

    hello everyone, I am wanting to sell my Benelli Nova 12 gauge shotgun. It accepts magnum shells and is in great condition. I bought this from a friend several years ago. He never shot it and I have only put approximately 50 rounds through it. I am looking to get $350 for this shotgun with...
  6. benchmark

    WTS WA  Benelli Nova 18-1/2" Tactical 12ga Shotgun

    $300 Brand New Benelli Nova Tactical Pump 12ga 18-12" w/Ghost Sights
  7. jaxworks

    WTS OR  Hatsan Nova 25 cal w/silencer/extras

    I have a very nice Hatsan Nova in 25 cal. for sale...comes with a 3 x 9 x 40mm Hawke scope and mounts, 4 clips and a fill probe, and a 80 cf scuba tank with attachments. These guns sell for $800.....with the tank this is over $1200 deal...asking $500 firm and would help deliver part way of a...
  8. P

    WTB WA  Benelli Nova 12ga 28 or 26 inch barrel

    title says it all!
  9. cHaOsReX

    Benelli Nova Tactical with ghost ring sights

    Benelli Nova Tactical with ghost ring sights Sling and butt stock shell holder included There is some slight cosmetic damage to the left side of the gun around the trigger can be seen in pics round count = less than 50 $300 Trades: S&W 586 4" no lock, Ruger PC Carbine 9mm, Colt Snake Gun, BCM...
  10. J

    WTS OR  Benelli Nova Tactical 12 ga

    Selling my Benelli Nova Tactical. Great condition and with low round count. Includes soft case and 5 round buttstock shell holder. Asking $240 and buyer pays transfer fees at FFL in PDX/Metro area
  11. wired

    WTS WA  Benelli Super Nova Tactical

    18 1/2" Barrel Modified choke ghost ring sights Benelli Super Nova Tactical with Nordic 2 round extension and side rail adapter. Includes original Benelli tube cap and spring, follower. $450. Great 12 gauge 3 1/2" chamber (!) pump gun with unloading feature.
  12. winsler

    WTS WA  Benelli Nova Pump Action unfired

    bought on a whim and been sitting in the safe unfired. 28” barrel 12 gauge and all the chokes that come with Will also come with 200 rounds of ammo.SOLD
  13. bpotter01

    WTT OR  Beneli nova or win. sxp

    Have a beneli nova and a Winchester sxp. Both are 12g 3.5" both camo beneli is well used sxp is new looking for trade offers not set on anything just don't need two guns that are the same. In the picture the benelli is far left win is on right thanks