Results 51 to 60 of about 270 (168)

Observations of Southern Dwarf Novae [PDF]

International Astronomical Union Colloquium, 1979
Preliminary results of spectroscopic and photometric data for five dwarf novae are presented : 1) V 436 Cen. The orbital period of 0.0669 days was determined from radial velocity variations. The RV half amplitude of the primary, K1. = 159 km/s, implies very small masses of M1 ≲ 0.20 M⊙ and M2 = 0.18 M⊙ for the binary components.2) Z Cha. Broad emission
openaire   +1 more source

Millinovae: A New Class of Transient Supersoft X-Ray Sources without a Classical Nova Eruption

The Astrophysical Journal Letters
Some accreting binary systems containing a white dwarf (such as classical novae or persistent supersoft sources) are seen to emit low-energy X-rays with temperatures of  ∼ 10 ^6 K and luminosities exceeding 10 ^35 erg s ^−1 .
Przemek Mróz, Krzysztof Król, Hélène Szegedi, Philip Charles, Kim L. Page, Andrzej Udalski, David A. H. Buckley, Gulab Dewangan, Pieter Meintjes, Michał K. Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Radosław Poleski, Jan Skowron, Krzysztof Ulaczyk, Mariusz Gromadzki, Krzysztof Rybicki, Patryk Iwanek, Marcin Wrona, Mateusz J. Mróz   +20 more
doaj   +1 more source

The Dwarf Nova PQ Andromedae

Publications of the Astronomical Society of the Pacific, 2005
We report a photometric study of the WZ Sagittae-type dwarf nova PQ Andromedae. The light curve shows strong (0.05 mag full amplitude) signals with periods of 1263(1) and 634(1) s, and a likely double-humped signal with P=80.6(2) min. We interpret the first two as nonradial pulsation periods of the underlying white dwarf, and the last as the orbital ...
Patterson, Joseph, Thorstensen, John, Armstrong, Eve, Henden, Arne, Hynes, Robert   +4 more
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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

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

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

High Energy Emission of Symbiotic Recurrent Novae: RS Oph and V407 Cyg

Open Astronomy, 2012
Recurrent novae occurring in symbiotic binaries are candidate sources of high energy photons, reaching GeV energies. Such emission is a consequence of particle acceleration leading to pion production.
Hernanz M., Tatischeff V.
doaj   +1 more source

A Photoionization Model for the Infrared Coronal Line Emission in the Classical Nova V1716 Scorpii

The Astrophysical Journal
A near-infrared spectrum of nova V1716 Scorpii (PNV J17224490-4137160), a recent bright ( ${V}_{\max }=7.3$ mag), Fermi-LAT detected γ -ray source, was modeled using the photoionization code CLOUDY.
C. E. Woodward, G. Shaw, S. Starrfield, A. Evans, K. L. Page   +4 more
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Dwarf Nova Oscillations: New Results

, 2001
New and archived observations of VW Hyi in outburst show the occasional presence of optical Dwarf Nova Oscillations (DNOs) over the range of 18 - 40 s. There is a rapid increase in period near the end of outburst, at the same time that the EUV falls almost to zero, which we attribute to propellering. The DNOs return to a shorter period after this phase,
Warner, Brian, Woudt, Patrick
openaire   +2 more sources