4 papers
Luminosities of [O III] and Hydrogen Balmer lines in nova shells years and decades after outburst
Ronald A. Downes, Hilmar W. Duerbeck, Catherine E. Delahodde
The evolution of the luminosity of nova shells in the century following the nova outburst is studied for the lines H-alpha, H-beta, and [O III]. About 1200 flux measurements from 9…
The light curve of V605 Aql
H. W. Duerbeck, M. L. Hazen, A. A. Misch +1
``Nova Aquilae No. 4'', discovered in 1919, later renamed V605 Aql, was recognized to be a final helium flash object only in the 1980s. Clayton and De Marco (1997) gave a detailed…
Optical photometry of V4334 Sgr (Sakurai's Object)
H. W. Duerbeck
The optical photometric evolution of the final helium flash object V4334 Sgr from 1994 to 2000 is described. The rise to optical maximum (1994 - 1996) is characterized by a continu…
Optical observations of the black hole candidate XTE J1550-564 during the Sep/Oct 1998 outburst
C. Sanchez-Fernandez, A. J. Castro-Tirado, H. W. Duerbeck +11
We report here optical observations during the September/October 1998 outburst of the black hole candidate XTE J1550-564. CCD photometry was obtained for the optical counterpart wi…