Results 101 to 110 of about 82,748 (221)

Observations of Five Southern-hemisphere Cataclysmic Binary Stars

The Astronomical Journal
We present observations and analyses of five little-studied cataclysmic binary stars in the southern celestial hemisphere. Our new observations are from the South African Astronomical Observatory.
John R. Thorstensen, Annabelle E. Niblett, Shreya Gandhi, Lauren P. Zanarini, Gavin D. Goss, Arnav Singh, Divik Verma, Ryan C. Hickox, Emmanuel A. Durodola, Jiaqi Martin Ying   +9 more
doaj   +1 more source

The Shape of Long Outbursts in U Gem Type Dwarf Novae from AAVSO Data [PDF]

, 2012
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 out bursts that are extremely well-characterized. The systems are U Gem and S8 Cyg. Our goal is
Cannizzo, John K.
core  

A 70 pc Diameter Nova Superremnant Surrounding the Recurrent Nova RS Ophiuchi

The Astronomical Journal
Recurrent novae undergo thermonuclear-powered eruptions separated by less than 100 yr, enabled by subgiant or red giant donors transferring hydrogen-rich matter at very high rates onto their massive white dwarf companions.
Michael M. Shara, Kenneth M. Lanzetta, Alexandra Masegian, James T. Garland, Stefan Gromoll, Alexei Kniazev, Lee Townsend, David Zurek, Joanna Mikolajewska, David Valls-Gabaud, Frederick M. Walter, John K. Webb   +11 more
doaj   +1 more source

Search for ²²Na in novae supported by a novel method for measuring femtosecond nuclear lifetimes. [PDF]

Nat Commun, 2023
Fougères C, de Oliveira Santos F, José J, Michelagnoli C, Clément E, Kim YH, Lemasson A, Guimarães V, Barrientos D, Bemmerer D, Benzoni G, Boston AJ, Böttger R, Boulay F, Bracco A, Čeliković I, Cederwall B, Ciemala M, Delafosse C, Domingo-Pardo C, Dudouet J, Eberth J, Fülöp Z, González V, Gottardo A, Goupil J, Hess H, Jungclaus A, Kaşkaş A, Korichi A, Lenzi SM, Leoni S, Li H, Ljungvall J, Lopez-Martens A, Menegazzo R, Mengoni D, Million B, Mrázek J, Napoli DR, Navin A, Nyberg J, Podolyák Z, Pullia A, Quintana B, Ralet D, Redon N, Reiter P, Rezynkina K, Saillant F, Salsac MD, Sánchez-Benítez AM, Sanchis E, Şenyiğit M, Siciliano M, Smirnova NA, Sohler D, Stanoiu M, Theisen C, Valiente-Dobón JJ, Ujić P, Zielińska M.   +61 more
europepmc   +1 more source

X-Ray Spectroscopy Mass Constraints on V1674 Her: The Fastest Nova does not have a Near-Chandrasekhar White Dwarf

The Astrophysical Journal
V1674 Her (Nova Her 2021) is the fastest classical nova ever recorded, with an optical decline time of t _2  ∼ 1 day, typically interpreted as evidence for a white dwarf mass close to the Chandrasekhar limit.
Tekeba Olbemo, Manel Errando, Andrea Gokus   +2 more
doaj   +1 more source

Dwarf Nova Outbursts and Superoutbursts [PDF]

International Astronomical Union Colloquium, 1996
Dwarf nova outbursts provide an almost unique opportunity of getting an insight into the nature of viscosity in accretion disks or, within the α- disk approach, of putting some constraints on α. In particular, the strong dependence of the viscous time-scale on viscosity itself permits us to estimate a almost directly from the observed time-scales.
openaire   +1 more source

Models for various aspects of dwarf novae and nova-like stars [PDF]

, 1993
The first attempts to explain the nature of dwarf novae were based on the assumption of single-star phenomena, in which emission lines were assumed to be caused by circumstellar gas shells.
Ladous, Constanze
core  

Spectroscopic Identification and Population Properties of Cataclysmic Variables from DESI DR1

The Astrophysical Journal Supplement Series
We present a systematic search for cataclysmic variables (CVs) using spectroscopic data from Data Release 1 of the Dark Energy Spectroscopic Instrument. Applying the Bagging-TopPush algorithm, we identified 433 CV candidates and related objects, of which
Wen Hou, Jia-Mao Lin, A-Li Luo, Zhi-Bin Dai, Yi-Qiao Dong, Shu-Guo Ma   +5 more
doaj   +1 more source

Can dwarf novae produce type Ia supernovae?

Astronomy & Astrophysics
Context. Accreting white dwarfs (WDs) are considered some of the most promising progenitor candidates of type Ia supernovae (SNe Ia). Dwarf novae (DNe), a subclass of cataclysmic variables, consist of a CO WD accretor and a low-mass donor star, which can
Li R., Wu C., Dai Z., Wang B.
doaj   +1 more source

Long Period Variables in Local Group Dwarf Galaxies [PDF]

, 2006
In this work the results are presented of an extensive search for Long Period Variables stars (LPVs) in a sample of Local Group irregular dwarf galaxies.
Snigula, Jan
core   +1 more source