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Continuing the project described by Kato et al. (2009, PASJ 61, S395, arXiv:0905.1757), we collected times of superhump maxima for 51 SU UMa-type dwarf novae mainly observed during the 2010-2011 season. Although most of the new data for…

We carried out time-resolved $V$-band photometry of DM Lyr during long outbursts in 1996 July and in 1996 February-March at Ouda Station, Kyoto University and at Osaka Kyoiku University. Since superhumps were clearly detected in the light…

天体物理学 · 物理学 2015-06-24 D. Nogami , H. Baba , K. Matsumoto , T. Kato

V1674 Her is one of the fastest novae, of which the very early phase is well observed including optical rise to the peak over 10 magnitudes. We present a full theoretical light curve model of V1674 Her. Our $1.35~M_\odot$ white dwarf (WD)…

太阳与恒星天体物理 · 物理学 2025-06-06 Mariko Kato , Izumi Hachisu , Hideyuki Saio

I analyzed the Kepler long and short cadence data of V363 Lyr. A period of 0.185723(8) d was persistently detected and this is identified as the orbital period. V363 Lyr showed one long outburst accompanied by an "(embedded) precursor"…

太阳与恒星天体物理 · 物理学 2021-11-16 Taichi Kato

Light curve analysis of decay phase of nova outburst are summarized. Nova duration is determined by the strong wind mass-loss which depends only on the white dwarf mass. Fast novae correspond very massive white dwarfs and very slow novae…

天体物理学 · 物理学 2007-05-23 Mariko Kato

We examine the light curve of the July-August 2001 superoutburst of WZ Sagittae. During the decline from maximum light the locally defined decay time increases from ~4 d/mag to ~12 d/mag over the first ~15 d of the ~25 d superoutburst, as…

天体物理学 · 物理学 2009-11-07 John K. Cannizzo

In the framework of the dwarf nova thermal-viscous disc instability model, we investigate the combined effects on the predicted dwarf nova lightcurves of irradiating the accretion disc and the secondary star and of evaporating the inner…

天体物理学 · 物理学 2007-05-23 Jean-Marie Hameury , Jean-Pierre Lasota , Brian Warner

We examine the AAVSO light curve of U Geminorum from 1908 to 2002, with particular focus on the October 1985 outburst. This outburst was longer than any other seen in U Gem by about a factor of 2, and appears to be unique among all dwarf…

天体物理学 · 物理学 2009-11-07 John K. Cannizzo , Neil Gehrels , Janet A. Mattei

We have modeled the unusual orbital light curve of V1494 Aquilae (Nova Aquilae 1999 No.2) and found that such an unusual orbital light curve can be reproduced when there exist two-armed, spiral shocks on the accretion disk. V1494 Aql is a…

天体物理学 · 物理学 2009-11-10 Izumi Hachisu , Mariko Kato , Taichi Kato

We search the American Association of Variable Star Observers (AAVSO) archives of the two best studied dwarf novae in an attempt to find light curves for long outbursts that are extremely well-characterized. The systems are U Gem and SS…

太阳与恒星天体物理 · 物理学 2015-06-11 John K. Cannizzo

We present a theoretical light curve model of the recurrent nova M31N 2008-12a, the current record holder for the shortest recurrence period (1 yr). We combined interior structures calculated using a Henyey-type evolution code with…

高能天体物理现象 · 物理学 2015-08-06 Mariko Kato , Hideyuki Saio , Izumi Hachisu

We report on time series of CCD photometry of V4140 Sgr between 1991 and 2001. The analysis reveals that the object was in the decline from an outburst in 1992 and again in outburst in 2001. The historical light curve collected by amateur…

天体物理学 · 物理学 2009-11-10 B. Borges , R. Baptista

We report extensive photometry of the dwarf nova V419 Lyr throughout its 2006 July superoutburst till quiescence. The superoutburst with amplitude of ~3.5 magnitude lasted at least 15 days and was characterized by the presence of clear…

天体物理学 · 物理学 2007-10-08 A. Rutkowski , A. Olech , K. Mularczyk , D. Boyd , R. Koff , M. Wiśniewski

Portions of the Kepler K2 Short Cadence light curve of the dwarf nova (DN) TW Vir at quiescence are investigated using light curve modeling. The light curve was separated into 24 sections, each with a data length of $\sim\,$0.93\,d,…

太阳与恒星天体物理 · 物理学 2020-12-23 Zhibin Dai , Paula Szkody , Peter M. Garnavich

A theoretical light curve for the 1987 outburst of V394 Coronae Austrinae (V394 CrA) is modeled to obtain various physical parameters of this recurrent nova. We then apply the same set of parametersto a quiescent phase and confirm that…

天体物理学 · 物理学 2009-10-31 Izumi Hachisu , Mariko Kato

Warps are suspected in disks around massive compact objects. However, the proposed warping source -- non-axisymmetric radiation pressure -- does not apply to white dwarfs. In this letter we report the first Smoothed Particle Hydrodynamic…

太阳与恒星天体物理 · 物理学 2012-09-05 M. M. Montgomery

This study of SDSS0804 is primarily concerned with the double-hump shape in the light curve and its connection with the accretion disk in this bounce-back system. Time-resolved photometric and spectroscopic observations were obtained to…

太阳与恒星天体物理 · 物理学 2015-06-12 S. Zharikov , G. Tovmassian , A. Aviles , R. Michel , D. Gonzalez-Buitrago , Ma. T. Garcia-Diaz

The spectra of disc-dominated cataclysmic variables (CVs) often deviate from the spectra of accretion disc models; in particular, the Balmer jump and absorption lines are found to be shallower in the observations than in the models. We…

太阳与恒星天体物理 · 物理学 2020-04-29 Patrick Godon , Edward M. Sion , Paula Szkody , William P. Blair

We follow the changes in the structure of the accretion disk of the dwarf nova V2051 Oph along two separate outbursts in order to investigate the causes of its recurrent outbursts. We apply eclipse mapping techniques to a set of light…

天体物理学 · 物理学 2009-06-23 R. Baptista , R. F. Santos , M. Faundez-Abans , A. Bortoletto

We present new observations of the cataclysmic variable V523 Lyr, a member of the open cluster NGC 6791. The Kepler Space telescope obtained photometric observations of this source and we examine the nearly 3 year long light curve. The…

太阳与恒星天体物理 · 物理学 2016-04-20 E. Mason , S. B. Howell