A Hubble Space Telescope survey for novae in M87 – III. Are novae good standard candles 15 d after maximum brightness?
2018
Ten weeks of daily imaging of the giant
elliptical galaxyM87 with the Hubble Space Telescope (HST) has yielded 41 nova
light curvesof unprecedented quality for extragalactic
cataclysmicvariables. We have recently used these
light curvesto demonstrate that the observational scatter in the so-called
maximum-magnituderate of decline (MMRD) relation for classical novae is so large as to render the nova-MMRD useless as a standard
candle. Here, we demonstrate that a modified Buscombe–de Vaucouleurs hypothesis, namely that novae with decline times t_2 > 10 d converge to nearly the same
absolute magnitudeabout two weeks after maximum light in a giant
elliptical galaxy, is supported by our M87 nova data. For 13 novae with daily sampled
light curves, well determined times of maximum light in both the F606W and F814W filters, and decline times t_2 > 10 d we find that M87 novae display M_(606W,15) = −6.37 ± 0.46 and M_(814W,15) = −6.11 ± 0.43. If very fast novae with decline times t_2 < 10 d are excluded, the distances to novae in
elliptical galaxieswith stellar binary populations similar to those of M87 should be determinable with 1σ accuracies of ± 20 per cent with the above calibrations.
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