NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-25 T15:50:14 PDT
Help | Comment | NED Home

For refcode 2010ApJ...725..831S:
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2010ApJ...725..831S An Extended Grid of Nova Models. III. Very Luminous, Red Novae Shara, Michael M.; Yaron, Ofer; Prialnik, Dina; Kovetz, Attay; Zurek, David Abstract. Extremely luminous, red eruptive variables like RV in M31 are being suggested as exemplars of a new class of astrophysical objects. Our greatly extended series of nova simulations shows that classical nova models can produce very red, luminous eruptions. In a poorly studied corner of three-dimensional nova parameter space (very cold, low-mass white dwarfs, accreting at very low rates) we find bona fide classical novae that are very luminous and red because they eject very slowly moving, massive envelopes. A crucial prediction of these nova models---in contrast to the predictions of merging star ("mergeburst") models---is that a hot remnant, the underlying white dwarf, will emerge after the massive ejected envelope has expanded enough to become optically thin. This blue remnant must fade on a timescale of decades---much faster than a "mergeburst," which must fade on timescales of millennia or longer. Furthermore, the cooling nova white dwarf and its expanding ejecta must become redder in the years after eruption, while a contracting mergeburst must become hotter and bluer. We predict that red novae will always brighten to L ~ 1000 L_sun_ for about one year before rising to the maximum luminosity at L ~ 10^6^-10^7^ L_sun_. The maximum luminosity attainable by a nova is likely to be L ~ 10^7^ L_sun_, corresponding to M ~ -12. In an accompanying paper, we describe a fading, luminous blue candidate for the remnant of M31-RV; it is observed with the Hubble Space Telescope to be compatible only with the nova model. Key words: accretion, accretion disks, binaries: close, novae, cataclysmic variables, white dwarfs
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home