Results 61 to 70 of about 125,367 (265)

Helium-deficient ER UMa-type Dwarf Nova below the Period Minimum with a Hot Secondary

The Astrophysical Journal
We present the discovery of a peculiar dwarf nova KSP-OT-201712a using high-cadence, multicolor observations made with the Korea Microlensing Telescope Network.
Youngdae Lee, Dae-Sik Moon, Sang Chul Kim, Hong Soo Park, Yuan Qi Ni   +4 more
doaj   +1 more source

The Accreting White Dwarfs in Cataclysmic Variables

Galaxies, 2022
Accreting white dwarfs (WDs) in cataclysmic variables (CVs) provide crucial insights about the accretion of mass and angular momentum in all types of binaries, including accreting NSs and BHs.
Edward M. Sion, Patrick Godon
doaj   +1 more source

Dose‐Dependent Effects of Biochar on Soil Revealed by Fast Field‐Cycling (FFC) NMR: From Molecular Water Dynamics to Soil Functionality

Magnetic Resonance in Chemistry, EarlyView.
Dose–response of biochar in a clay soil: fifteen mixtures (fBC 0–1) reveal nonlinear thresholds (pH/EC) and sharp WHC gains near fBC ≈ 0.3–0.5. Coupled FT‐IR and FFC‐NMR (0.01–10 MHz; ModelFree τc distributions) link water dynamics to soil functionality.
Calogero Librici, Paola Bambina, Ettore Madonia, Veronica Ciaramitaro, Delia Francesca Chillura Martino, Paolo Lo Meo, Pellegrino Conte   +6 more
wiley   +1 more source

BEACONS IN THE DARK: USING NOVAE AND SUPERNOVAE TO DETECT DWARF GALAXIES IN THE LOCAL UNIVERSE [PDF]

, 2015
We propose that luminous transients, including novae and supernovae (SNe), can be used to detect the faintest galaxies in the universe. Beyond a few megaparsecs, dwarf galaxies with stellar masses ≲ 10 6 M ⊙ ?> will likely be too faint and/or too low in ...
C. Conroy, J. Bullock
semanticscholar   +1 more source

Survey of period variations of superhumps in SU UMa-type dwarf novae. X. The tenth year (2017) [PDF]

Nippon Tenmon Gakkai obun kenkyu hokoku, 2009
Continuing the project described by Kato et al. (2009, PASJ, 61, S395), we collected times of superhump maxima for 102 SU UMa-type dwarf novae observed mainly during the 2017 season, and characterized these objects. WZ Sge-type stars identified in this
Taichi Kato, A. Imada, M. Uemura, D. Nogami, H. Maehara, R. Ishioka, H. Baba, K. Matsumoto, H. Iwamatsu, K. Kubota, K. Sugiyasu, Y. Soejima, Y. Moritani, T. Ohshima, Hiroyuki Ohashi, Junpei Tanaka, M. Sasada, A. Arai, K. Nakajima, S. Kiyota, K. Tanabe, K. Imamura, Nanae Kunitomi, K. Kunihiro, Hiroki Taguchi, Mitsuo Koizumi, Norimi Yamada, Y. Nishi, Mayumi Kida, S. Tanaka, Rie Ueoka, Hideki Yasui, Koichi Maruoka, A. Henden, A. Oksanen, M. Moilanen, P. Tikkanen, M. Aho, B. Monard, H. Itoh, P. Dubovský, I. Kudzej, R. Dancikova, T. Vanmunster, J. Pietz, G. Bolt, D. Boyd, P. Nelson, T. Krajci, L. Cook, K. Torii, D. Starkey, J. Shears, L. Jensen, G. Masi, R. Novák, T. Hynek, R. Kocián, L. Král, H. Kučáková, M. Kolasa, P. Stastny, B. Staels, E. al.   +63 more
semanticscholar   +1 more source

Hidden lineages in the African Sky Islands: A taxonomic reevaluation of Afrocarduus (Compositae)

Journal of Systematics and Evolution, EarlyView.
Species delimitation is crucial for biodiversity studies. Using Hyb‐Seq and phylogenomics, we reassessed Afrocarduus, endemic to Afromontane and Afroalpine regions, uncovering 16 evolutionary lineages (2.3 Mya). Morphological data support their distinctiveness, with acaulescence evolving independently twice. The traditionally broad A.
Lucía D. Moreyra, Juan Antonio Calleja, Cristina Roquet, Siri Birkeland, Carme Blanco‐Gavaldà, Mercè Galbany‐Casals, Abel Gizaw, Frederik Leliaert, Christian Brochmann, Alfonso Susanna   +9 more
wiley   +1 more source

A SPOT STRUCTURE OF ACCRETION DISK OF U GEMINORUM

Odessa Astronomical Publications, 2017
On the basis of modelling of emission lines of dwarf novae U Gem, conclusion is made, that the observed orbital phase change of model parameters of a accretion disk can not be explained in frameworks of Keplerian velocity field in a disk.
N. V. Borisov, V. V. Neustroev
doaj   +1 more source

The Fall and the Rise of X-Rays from Dwarf Novae in Outburst: RXTE Observations of VW Hydri and WW Ceti [PDF]

, 2011
In a dwarf nova, the accretion disk around the white dwarf is a source of ultraviolet, optical, and infrared photons, but is never hot enough to emit X-rays.
Derek Fertig, K. Mukai, Thomas Nelson, J. Cannizzo   +3 more
semanticscholar   +1 more source

Nations as Natural Families: From Kin Selection to Multilevel Selection

Nations and Nationalism, EarlyView.
ABSTRACT In nationalism studies, nations are often viewed as artificial constructs. By contrast, many sociobiologists see nations as natural families or kin groups. They explain altruism and shared ancestry among co‐nationals through kin selection theory, which accounts for altruism towards close genetic relatives. In this article, we refine and deepen
Filipe Nobre Faria, Sandra Dzenis
wiley   +1 more source

Characterization of Dwarf Novae Using SDSS Colors [PDF]

, 2011
We have developed a method for estimating the orbital periods of dwarf novae from the Sloan Digital Sky Survey (SDSS) colors in quiescence using an artificial neural network.
Taichi Kato, H. Maehara, M. Uemura
semanticscholar   +1 more source