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Browsing by Author "Koff, Robert"
Now showing items 1-6 of 6
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BK Lyncis: the oldest old nova?... and a Bellwether for cataclysmic variable evolution
Patterson, Joseph; Uthas, Helena; Kemp, Jonathan; Miguel Agustino, Enrique de
; Krajci, Thomas; Foote, Jerry; Hambsch, Franz-Josef; Campbell, Tut; Roberts, George; Cejudo, David; Dvorak, Shawn; Vanmunster, Tonny; Koff, Robert; Skillman, David; Harvey, David; Martin, Brian; Rock, John; Boyd, David; Oksanen, Arto; Morelle, Etienne; Ulowetz, Joseph; Kroes, Anthony; Sabo, Richard; Jensen, Lasse (Oxford University Press, 2013)
We summarize the results of a 20-year campaign to study the light curves of BK Lyncis, a nova-like star strangely located below the 2-3 hour orbital period gap in the family of cataclysmic variables. Two apparent ... -
The helium-rich cataclysmic variable SBSS 1108+574
Carter, P. J.; Steeghs, D.; Miguel Agustino, Enrique de; Goff, W.; Koff, Robert; Krajci, Thomas; Marsh, T. R.; Gänsicke, B. T.; Breedt, E.; Groot, P. J.; Nelemans, G.; Roelofs, G. H. A.; Rau, A.; Koester, D.; Kupfer, T. (Oxford University Press, 2013)
We present time-resolved spectroscopy and photometry of the dwarf nova SBSS 1108+574, obtained during the 2012 outburst. Its quiescent spectrum is unusually rich in helium, showing broad, double-peaked emission lines from ... -
HT Cas - eclipsing dwarf nova during its superoutburst in 2010
Bąkowska, K.; Olech, A.; Rutkowski, A.; Koff, Robert; Miguel Agustino, Enrique de; Otulakowska-Hypka, M. (Cornell University, 2013)
We present results of a world-wide observing campaign of the eclips- ing dwarf nova - HT Cas during its superoutburst in November 2010. Using collected data we were able to conduct analysis of the light curves and ... -
IX Draconis – a curious ER UMa-type dwarf nova
Otulakowska-Hypka, M.; Olech, A.; Miguel Agustino, Enrique de; Rutkowski, A.; Koff, Robert; Ba֒kowska, K. (Oxford University Press, 2013)
We report results of an extensive worldwide observing campaign devoted to a very active dwarf nova star – IX Draconis. We investigated photometric behaviour of the system to derive its basic outburst properties and understand ... -
SDSS J162520.29+120308.7 – a new SU Ursae Majoris star in the period gap
Olech, A.; Miguel Agustino, Enrique de; Otulakowska-Hypka, M.; Thorstensen, J. R.; Rutkowski, A.; Novak, R.; Masi, G.; Richmond, M.; Staels, B.; Lowther, S.; Stein, W.; Ak, T.; Boyd, David; Koff, Robert; Patterson, Joseph; Eker, Z. (European Southern Observatory, 2011)
We report results of an extensive world-wide observing campaign devoted to the recently discovered dwarf nova SDSS J162520.29+120308.7 (SDSS J1625). The data were obtained during the July 2010 eruption of the star and in ... -
The first confirmed superoutburst of the dwarf nova GALEX J215818.5+241924
Shears, Jeremy; Koff, Robert; Masi, G.; Miguel Agustino, Enrique de; Miller, Ian; Roberts, George; Sabo, Richard; Stein, William; Ulowetz, Joseph (Cornell University, 2013)
In 2011 October an optical transient was reported in Pegasus as a possible nova. The object had an ultraviolet counterpart, GALEX J215818.5+241924. In this paper we present follow-up photometry of the object which revealed ...
