Zobrazeno 1 - 10
of 784
pro vyhledávání: '"De Freitas, D"'
We investigate the flux intensities spanning from radio waves to $\gamma$-rays across 36 light curves of Quasar 3C 273, utilizing publicly available data collected by the Integral Science Data Centre (ISDC) database. Our analysis reveals a consistent
Externí odkaz:
http://arxiv.org/abs/2405.17244
This study presents photometric solutions for a carefully selected sample of 181 detached eclipsing binary systems recently observed by the Transiting Exoplanet Survey Satellite (TESS) mission. Our findings contribute to discussions about OBA-type sy
Externí odkaz:
http://arxiv.org/abs/2404.13374
Autor:
de Freitas, D. B., França, G. S.
A multifractal methodology was utilized to analyze a set of seismic sequences distributed along the Pacific Ring of Fire, sourced from the National Earthquake Information Center (NEIC) catalog. The analysis employed the Multifractal Detrended Moving
Externí odkaz:
http://arxiv.org/abs/2402.02214
We study the first gravitational wave, GW150914, detected by advanced LIGO and constructed from the data of measurement of strain relative deformation of the fabric of spacetime. We show that the time series from the gravitational wave obeys Tsallis'
Externí odkaz:
http://arxiv.org/abs/2301.10036
Autor:
Filho, F. J. S. Lima, Ferreira, V. M. B., Filho, P. C. F. da Silva, Gomes, F. O. da Silva, Alves, B. W. de Freitas, Barbosa, S. G. A., Santiago, T. de Melo, de Freitas, D. B.
Astrophysical data, in the domains of time, involve a wide range of stellar variability phenomena, among them the magnetic activity of the order of a few hours until the signature of an extra-solar planet which can cover a scale of time of a few days
Externí odkaz:
http://arxiv.org/abs/2209.04408
The aim of this work is to determine the deviation of the value of magnetic braking index $q$ from Skumanich $q=3$ canonical value for giant and main-sequence stars. In this context, the present work attempts to analytically calculate the braking ind
Externí odkaz:
http://arxiv.org/abs/2208.11829
Publikováno v:
A&A 650, A40 (2021)
Kepler-30 is a unique target to study stellar activity and rotation in a young solar-like star accompanied by a compact planetary system. We use about 4 years of high-precision photometry collected by the Kepler mission to investigate the fluctuation
Externí odkaz:
http://arxiv.org/abs/2103.15921
Autor:
Viana, C. A. P., de Freitas, D. B.
We analyse the mechanisms ruling galactic disc heating through the dynamics of space velocities $U$, $V$ and $W$, extracted from the Geneva-Copenhagen catalogue. To do this, we use a model based on non-extensive statistical mechanics, where we derive
Externí odkaz:
http://arxiv.org/abs/2009.03084
Autor:
de Freitas, D. B.
In this first work attempts to analytically explain the effects on the magnetic braking index, $q$, caused by the evolution of stellar velocity in main-sequence stars, and estimated by de Freitas \& De Medeiros (2013). We have found that the effect o
Externí odkaz:
http://arxiv.org/abs/2003.01444
In the present paper, we analyze the signatures of long-range persistence in seismic sequences along Circum-Pacific subduction zones, from Chile to Kermadec, extracted from the National Earthquake Information Center (NEIC) catalog. This region, known
Externí odkaz:
http://arxiv.org/abs/1912.02092