Results 11 to 20 of about 498 (87)

Three-dimensional structure of the milky way dust: modeling of LAMOST data

, 2018
We present a three-dimensional modeling of the Milky Way dust distribution by fitting the value-added star catalog of LAMOST spectral survey. The global dust distribution can be described by an exponential disk with scale-length of 3,192 pc and scale ...
Chen, Bingqiu, Hou, Jinliang, Huang, Yang, Li, Linlin, Liu, Xiaowei, Shen, Shiyin, Xiang, Maosheng, Yuan, Haibo   +7 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

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

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

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

Spatial behavior of socially isolated wild pigs (Sus scrofa) following sounder removal via trapping

Pest Management Science, EarlyView.
Following partial sounder removal, socially isolated wild pigs maintained site fidelity near traps, highlighting post‐control behavioral tendencies that are relevant to pest management and disease mitigation. Abstract BACKGROUND The rapid expansion of wild pig (Sus scrofa) populations across North America, coupled with increased concern over disease ...
Sebastian Gomez‐Maldonado, Matthew T McDonough, Jonathon J Valente, Mark D Smith, Stephen S. Ditchkoff   +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

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

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

The Star Catalogue of Hevelius

, 2010
The catalogue by Johannes Hevelius with the positions and magnitudes of 1564 entries was published by his wife Elisabeth Koopman in 1690. We provide a machine-readable version of the catalogue, and briefly discuss its accuracy on the basis of comparison ...
van Gent, Robert H., Verbunt, Frank
core   +1 more source