We analyze the evolution of binary stars to calculate synthetic rates and delay times of the most promising Type Ia Supernovae progenitors. We present and discuss evolutionary scenarios in which a white dwarf reaches the Chandrasekhar-mass and potentially explodes in a Type Ia supernova. We consider: Double Degenerate (DDS; merger of two white dwarfs), Single Degenerate (SDS; white dwarf accret...

ASASSN-21au is an ultracompact accreting white dwarf binary (AM CVn) with a period of approx. 58 min. Using multiwavelength observations the system, we discovered dichotomy in behavior outbursts AM CVns. The showed initial brightness increase which lasted for at least 82 days, followed by additional 2 weeks. Afterwards went into superoutburst total duration 19 showing amplitude respect to quies...

Abstract The space gravitational wave (GW) detector Laser Interferometer Space Antenna (LISA) that is planned to be launched in the early 2030s will detect low-frequency GW signals Galaxy. AM CVn stars were generally thought important sources. Employing MESA code, this work we calculate evolution of a great number binary systems consisting white dwarf (WD) and main sequence (MS) star, diagnose ...

We briefly summarize the observational properties of ultra-compact binaries called AM CVn stars. We analize their outbursts originating from the thermal-viscous instability in helium accretion disc. We present our preliminary results in applying the model of Dwarf Novae outbursts to helium discs. We can calculate models of outbursts of reasonable amplitude of 2 mag with a constant α parameter t...

We describe the ultraviolet spectra of the Ap star α CVn that have been acquired with the Hubble Space Telescope and the nature of the optical region analyses for its rotational velocity and elemental abundances that have been undertaken in support of the ultraviolet data.

We report on Chandra ACIS observations of the ultracompact AM CVn binary ES Cet. This object has a 10.3 minute binary period and is the most compact of the confirmed AM CVn systems. We have, for the first time, unambiguously detected the X-ray counterpart to ES Cet. In a 20 ksec ACIS-S image a point-like X-ray source is found within 1 " of the catalogued optical position. The mean countrate in ...

OBJECTIVE To identify differentially expressed genes associated with motion sickness (MS) susceptibility in the rat caudal vestibular nucleus. METHODS We identified MS susceptible (MSS) and insusceptible (inMSS) rats by quantifying rotation-induced MS symptoms: defecation and spontaneous locomotion activity. Microarray analysis was used to screen differentially expressed genes in the caudal v...

Cooperative QoS routing (CQR) protocols have the potential to provide scalable information delivery in multi-service network application. However, CQR approach in harsh environments, in terms of long-range transmission, high dynamic topology, and three-dimensional monitor region, is still an open issue. In this paper, we propose a novel grid-based routing approach, namely FMCQR protocol, to gua...