Results 11 to 20 of about 476 (65)

Suzaku X-Ray Observation of the Dwarf Nova Z Camelopardalis at the Onset of an Optical Outburst

, 2012
We present the result of a Suzaku X-ray spectroscopic observation of the dwarf nova Z Camelopardalis, which was conducted by chance at the onset of an optical outburst. We used the X-ray Imaging Spectrometer (a 38 ks exposure) and the Hard X-ray Detector
Ebisawa, Ken, Ishida, Manabu, Saitou, Kei, Tsujimoto, Masahiro   +3 more
core   +1 more source

Discovery of an old nova remnant in the Galactic globular cluster M 22 [PDF]

, 2019
A nova is a cataclysmic event on the surface of a white dwarf in a binary system that increases the overall brightness by several orders of magnitude. Although binary systems with a white dwarf are expected to be overabundant in globular clusters (GCs ...
Bacon, Roland, Brinchmann, Jarle, Dreizler, Stefan, Giesers, Benjamin, Göttgens, Fabian, Husser, Tim-Oliver, Kamann, Sebastian, Kollatschny, Wolfram, Monreal-Ibero, Ana, Roth, Martin M., Schmidt, Kasper B., Weilbacher, Peter M., Wendt, Martin, Wisotzki, Lutz   +13 more
core   +5 more sources

Detection of Transitions between Dwarf Nova Outbursts, Standstills, and IW And–type Cycles

The Astrophysical Journal
IW And–type objects represent a rare and intriguing subclass of cataclysmic variables that challenge the classical disk instability model. Due to their long timescales, often lasting several months, observed samples are scarce, leaving the physics of ...
Qi-Bin Sun, Sheng-Bang Qian, Li-Ying Zhu, Qin-Mei Li, Wen-Ping Liao, Fu-Xing Li, Wen-Xu Lin, Min-Yu Li, Ping Li   +8 more
doaj   +1 more source

Idling Magnetic White Dwarf in the Synchronizing Polar BY Cam. The Noah-2 Project

, 2008
Results of a multi-color study of the variability of the magnetic cataclysmic variable BY Cam are presented. The observations were obtained at the Korean 1.8m and Ukrainian 2.6m, 1.2m and 38-cm telescopes in 2003-2005, 56 observational runs cover 189 ...
A. Bianchini, A.A. Henden, A.D. Silber, A.J. Norton, A.R. King, B. Warner, C. Hellier, E.P. Pavlenko, E.P. Pavlenko, E.P. Pavlenko, E.T. Whittaker, G.A. Wynn, H. Ritter, H.R. Richman, H.S. Stockman, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, I.L. Andronov, J. Patterson, J. Tremko, M. Cropper, M. Livio, M.M. Basko, P. Szkody, P.A. Mason, P.A. Mason, P.A. Mason, P.A. Mason, R. Hudec, R. Schwarz, R.A. Remillard, R.D. Geckeler, R.K. Honeycutt, S. Kafka, T. Neckel, T.A. Somova, V.V. Breus, W. Forman, Y.G. Kim, Y.G. Kim, Y.G. Kim   +49 more
core   +1 more source

Evaluating machine learning models for multi‐species wildlife detection and identification on remote sensed nadir imagery in South African savanna

Wildlife Biology, EarlyView.
This research paper investigates the efficacy of leading machine learning (ML) models for detecting and identifying ungulate species in African savanna using nadir imagery from unmanned aerial vehicles (UAVs). Traditional aerial counting methods, while widely used, suffer from significant limitations in accuracy and precision, in part due to human ...
Paul Allin, Fadel Seydou, Radloff Frans, Andrew Davies, Alison Leslie   +4 more
wiley   +1 more source

Superoutbursts and Positive Superhumps Occurred during the Standstill of a Z Cam-type Dwarf Nova

The Astrophysical Journal
Dwarf novae (DNe) are semidetached binaries, where a white dwarf accretes material from a cool main-sequence companion via an accretion disk, and are known for their intermittent outbursts, making them key systems for studying accretion physics.
Qi-Bin Sun, Sheng-Bang Qian, Li-Ying Zhu, Qin-Mei Li, Fu-Xing Li, Min-Yu Li, Ping Li   +6 more
doaj   +1 more source

A three dimensional extinction map of the Galactic Anticentre from multi-band photometry

, 2014
We present a three dimensional extinction map in $r$ band. The map has a spatial angular resolution, depending on latitude, between 3 -- 9\,arcmin and covers the entire XSTPS-GAC survey area of over 6,000\,$\rm deg^2$ for Galactic longitude $\rm 140 \leq$
Chen, B. -Q, Huang, Y., Jiang, B. -W., Liu, X. -W., Lu, H., Schultheis, M., Xiang, M. -S., Yao, J. -S., Yuan, H. -B., Zhang, H. -H., Zhao, H. -B.   +10 more
core   +1 more source

Pickin' up good vibrations: a systematic review of footfall detection and analysis in the realm of wildlife surveying

Wildlife Biology, EarlyView.
Exploration of new wildlife surveying methodologies that leverage advances in sensor technology and machine learning has led to tentative research into the application of seismology techniques. This, most commonly, involves the deployment of a footfall trap – a seismic sensor and data logger customised for wildlife footfall.
Benjamin J. Blackledge, Luigi La Spada, Robert A. Briers, Niamh M. McHugh, Patrick J. C. White   +4 more
wiley   +1 more source

Stunted Outbursts and Z Cam–like Behaviors in the Long-term Light Curves of Novalike Cataclysmic Variables

The Astrophysical Journal Supplement Series
A program of long-term ground-based photometric monitoring of 134 old novae and novalike cataclysmic variables (CVs) has been concluded. In this paper, we display, analyze, and discuss the light curves of 33 of these targets, which have shown “stunted ...
R. K. Honeycutt, Jeff W. Robertson, Brandon T. Radzom   +2 more
doaj   +1 more source

Solutions for 10,000 Eclipsing Binaries in the Bulge Fields of OGLE II Using DEBiL

, 2005
We have developed a fully-automated pipeline for systematically identifying and analyzing eclipsing binaries within large datasets of light curves. The pipeline is made up of multiple tiers which subject the light curves to increasing levels of scrutiny.
Alard C., Antonello E., Beaulieu J. P., Duquennoy A., Etzel P. B., Gorda S. Y., Jonathan Devor, Nelder J. A., Popper D. M., Schwarzenberg-Czerny A., Udalski A., Udalski A., Udalski A., Wozniak P. R.   +13 more
core   +1 more source