Zobrazeno 1 - 10
of 280
pro vyhledávání: '"Saio Hideyuki"'
Autor:
Kurtz, Donald W., Handler, Gerald, Holdsworth, Daniel L., Cunha, Margarida S., Saio, Hideyuki, Medupe, Thebe, Murphy, Simon J., Krüger, Joachim, Brunsden, E., Antoci, Victoria, Hey, Daniel R., Shitrit, Noi, Matthews, Jaymie M.
HD 60435 is a well-known rapidly oscillating (roAp) Ap star with a series of alternating even and odd degree modes, making it a prime asteroseismic target. It is also an oblique pulsator with rotational inclination, $i$, and magnetic/pulsation obliqu
Externí odkaz:
http://arxiv.org/abs/2412.04840
Publikováno v:
A&A 689, A169 (2024)
Accreting supermassive stars of $\gtrsim 10^{5}\,M_\odot$ will eventually collapse directly to a black hole via the general relativistic (GR) instability. Such direct collapses of supermassive stars are thought to be a possible formation channel for
Externí odkaz:
http://arxiv.org/abs/2406.18040
We present time-dependent nova outburst models with optically thick winds for a 1.2 and 1.35 $M_\odot$ white dwarfs (WDs) with a mass accretion rate of $5 \times 10^{-9}~M_\odot$ yr$^{-1}$ and for a 1.3 $M_\odot$ WD with $2 \times 10^{-9}~M_\odot$ yr
Externí odkaz:
http://arxiv.org/abs/2404.11237
We propose a helium nova model for the Large Magellanic Cloud (LMC) supersoft X-ray source (SSS) [HP99]159. This object has long been detected as a faint and persistent SSS for about 30 years, and recently been interpreted to be a source of steady he
Externí odkaz:
http://arxiv.org/abs/2307.05278
Autor:
Henriksen, Andreea I., Antoci, Victoria, Saio, Hideyuki, Grundahl, Frank, Kjeldsen, Hans, Van Reeth, Timothy, Bowman, Dominic M., Pápics, Péter I., De Cat, Peter, Krüger, Joachim, Andersen, M. Fredslund, Pallé, P. L.
Here we report an ensemble study of 214 A- and F-type stars observed by \textit{Kepler}, exhibiting the so-called \textit{hump and spike} periodic signal, explained by Rossby modes (r~modes) -- the \textit{hump} -- and magnetic stellar spots or overs
Externí odkaz:
http://arxiv.org/abs/2306.16766
Betelgeuse is a well known bright red supergiant that shows semi-regular variations with four approximate periods of 2200, 420, 230, and 185 days. While the longest period was customarily regarded as LSP (long secondary period) of unknown origin, we
Externí odkaz:
http://arxiv.org/abs/2306.00287
Autor:
Henriksen, Andreea I., Antoci, Victoria, Saio, Hideyuki, Cantiello, Matteo, Kjeldsen, Hans, Kurtz, Donald W., Murphy, Simon J., Mathur, Savita, García, Rafael A., Santos, Ângela R. G.
The Kepler mission revealed a plethora of stellar variability in the light curves of many stars, some associated with magnetic activity or stellar oscillations. In this work, we analyse the periodic signal in 162 intermediate-mass stars, interpreted
Externí odkaz:
http://arxiv.org/abs/2301.04974
Publikováno v:
The Astrophysical Journal Letters, 935, L15 (6pp), 2022 August 10. Open Access
An X-ray flash, expected in a very early phase of a nova outburst, was at last detected with the {\it SRG}/eROSITA in the classical nova YZ Reticuli 2020. The observed flash timescale, luminosity, and blackbody temperature substantially constrain the
Externí odkaz:
http://arxiv.org/abs/2208.01249
Publikováno v:
EPJ Web of Conferences, Vol 152, p 06002 (2017)
Classical Cepheid variable stars are both sensitive astrophysical laboratories and accurate cosmic distance tracers. We have recently investigated how the evolutionary effects of rotation impact the properties of these important stars and here provid
Externí odkaz:
https://doaj.org/article/44203e6248ae47fcbc0569dd65ad3ae3
Autor:
Holdsworth Daniel L., Kurtz Donald W., Smalley Barry, Saio Hideyuki, Handler Gerald, Murphy Simon J., Lehmann Holger
Publikováno v:
EPJ Web of Conferences, Vol 160, p 03004 (2017)
We present an analysis of the first K2 observations of a rapidly oscillating Ap (roAp) star, HD 24355. The star was discovered to be a roAp star by [1], with a frequency of 224.31 d-1 (2596.18 μHz; P = 6.4 min) and an amplitude of 1.51 mmag in Super
Externí odkaz:
https://doaj.org/article/41fb5e04e449404580ffe663d07d2978