Triggers:CNe

From Gaia Science Alerts Working Group
Revision as of 14:46, 28 July 2009 by Lukasz (talk | contribs)

Jump to: navigation, search
  • there is roughly 30 novae per year in the Milky Way and about 20 in other galaxies
  • absolute magnitude <math>M_V = -8 mag</math>
  • amplitude between 6 and 15 mag
  • quick rise of few days
  • slow decline, between few days and 100 days (fast: type A, slow: type B, very slow: type C)
  • 15 days after maximum its Mv = -5.5mag, independent on speed or class

Recurrent novae:

  • are produced by a white dwarf star and a red giant circling about each other in a close orbit
  • recurrent every 10-100 years
  • smaller amplitude: 4-9 mag
  • M_V at minimum is about 0-1 mag
  • example: RS Oph - 3 outbursts between 1957 and 1991 (AAVSO), exhibits some small variation in the baseline in minimum
  • decline within few days