Results 61 to 70 of about 270 (168)
The Vertical Structure of Accretion Disks for Dwarf Novae [PDF]
Journal of Astronomy and Space Sciences, 1985 We have constructed models of steady state accretion disk with accretion rate M=10^16 g/sec or 10^18 g/sec. The mass and the radius of white dwarf were taken as 1 Msolar and 10^9 cm, respectively. The possible application of the results to Z Cha and ZCam
Kyu Hong Choi, Kyung Mee Kim
doaj
MULTI-TIME-SCALE VARIABILITY OF STARS
Odessa Astronomical Publications, 2017 Physical mechanisms and corresponding mathematical models for different types of stellar variability are reviewed with applications to concrete stars.
I. L. Andronov
doaj +1 more source
The EUVE Observations of Dwarf Novae [PDF]
International Astronomical Union Colloquium, 1996 In the standard theory of dwarf novae in outburst, the boundary layer region between the inner edge of the accretion disk and the white dwarf surface radiates primarily in the extreme ultraviolet. Using EUVE, observers have been able to obtain spectra with sufficient spectral resolution to characterize accurately the emission from several dwarf novae ...
openaire +1 more source
A Demarcation Criterion for Hydrogen Burning of Millinovae
The Astrophysical JournalMillinovae are a new class of transient supersoft X-ray sources with no clear signature of mass ejection. They show similar triangle shapes of V / I band light curves with 1000 times fainter peaks than typical classical novae. Maccarone et al.
Izumi Hachisu, Mariko Kato
doaj +1 more source
On the of classification of BL Her subtype of the Type II Cepheids
EPJ Web of Conferences, 2015 The initial reason for studying Type II Cepheids (CWB) was for period changes, binarity or any other signs of change other than the pulsation. The GCVS contained 71 objects of this kind in 2012 when the wok started, and that list is now extended to 100 ...
Jurkovic Monika I.
doaj +1 more source
A radio-detected type Ia supernova with helium-rich circumstellar material. [PDF]
Nature, 2023 Kool EC +36 more
europepmc +1 more source
Nova Outbursts on Rotating Oblate White Dwarfs [PDF]
International Astronomical Union Colloquium, 1996 Observations of spatially resolved nova shells and reconstructions from emission line profiles show that a ring/blob asymmetry in the ejecta of novae is very common (Martin 1989). The polar blobs expand more rapidly than the equatorial rings, giving the ejecta an overall prolate geometry.Observations of the formation of carbonaceous and silicate dusts ...
openaire +2 more sources
A Phenomenon Resembling Early Superhumps in a New SU UMa-type Dwarf Nova with a 2 hr Orbital Period
The Astronomical JournalWe investigate K2BS5, an optical transient that we identified in Campaign 13 of the Kepler/K2 archives by the K2 Background Survey, and classify it as a new SU UMa-type dwarf nova.
Rebecca S. Boyle +6 more
doaj +1 more source
Fundamental Properties of Novae in M31
The Astrophysical Journal Supplement SeriesThe peak luminosities and rates of decline for a large sample of novae recently published by Clark et al. have been analyzed using the Yaron et al. nova models to estimate fundamental properties of the M31 nova population.
Allen W. Shafter, Kamil Hornoch
doaj +1 more source
The Astrophysical JournalA helium nova occurs on a white dwarf (WD) accreting hydrogen-deficient matter from a helium star companion. When the mass of a helium envelope on the WD reaches a critical value, unstable helium burning ignites to trigger a nova outburst.
Mariko Kato, Izumi Hachisu
doaj +1 more source