Are There Any Other Old Novae Like V1500 Cyg?

Details Are There Any Other Old Novae Like V1500 Cyg? Are There Any Other Old Novae Like V1500 Cyg?

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5124j&link_type=abstract

American Astronomical Society, AAS Meeting #211, #51.24; Bulletin of the American Astronomical Society, Vol. 39, p.819

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We have conducted an infrared spectroscopic and photometric survey of old novae that had short lived outbursts. We obtained low resolution infrared spectroscopy with NIRC on Keck, and JHK light curves using SQIID on the KPNO 2.1 m, of V1500 Cyg and several other old novae. V1500 Cygni is the prototype "magnetic nova", and exhibits large amplitude, orbitally modulated varations in the visual. The same types of variations (+/- 1.5 mag) are seen in the infrared. We use the Wilson-Divinney light curve modeling program to show that the varations remain consistent with a heavily irradiated, cool, late-type dwarf. None of the other novae have light curves with such large amplitudes. However, the K-band light curve of V1974 Cygni exhibits a similar morphology to V1500 Cygni, while the light curve of V446 Her has dramatic, large scale variations. Both of these objects are candidate magnetic novae. The IR spectra do not show any evidence for cyclotron emission, and appear to arise from an accretion disk.

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