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Observational and Theoretical Studies of 27 delta Scuti Stars with Investigation of the Period-Luminosity Relation
(IOP Publishing, 2021)
The multi-color CCD photometric study of 27 δ Scuti stars is presented. By using approximately three years
of photometric observations, we obtained the times of maxima and magnitude changes during the observation
time ...
Absolute parameters of young stars: PU Pup
(IOP Publishing, 2021)
We present combined photometric and spectroscopic analyses of the southern
binary star PU Pup. High-resolution spectra of this system were taken at the University of
Canterbury Mt. John Observatory in the years 2008 and ...
Can Solar Cycle 25 Be a New Dalton Minimum?
(Springer, 2021)
The aim of this study is to predict solar activity for the next 10 years (Solar Cycle 25) using
a deep learning technique known as a stateful Long Short-Term Memory (LSTM) network.
To achieve this goal the number of daily ...
A tidally tilted sectoral dipole pulsation mode in the eclipsing binary TIC 63328020
(Oxford University Press, 2021)
We report the discovery of the third tidally tilted pulsator, TIC 63328020. Observations with the TESS satellite reveal binary
eclipses with an orbital period of 1.1057 d, and δ Scuti-type pulsations with a mode frequency ...
Optimization applied to selected exoplanets
(Springer, 2021)
Transit and radial velocity models were applied to archival data in order to examine exoplanet properties, in particular for the recently discovered super-Earth GJ357b. There is however considerable variation in
estimated ...
Standard stellar luminosities: what are typical and limiting accuracies in the era after Gaia?
(Oxford University Press, 2021)
Methods of obtaining stellar luminosities (L) have been revised and a new concept, standard stellar luminosity, has been defined. In this paper, we study three methods: (i) a direct method from radii and effective temperatures; ...
The First Light Curve Solutions and Period Study of BQ Ari
(Springer, 2021)
The first analysis of the photometric observation in BVR filters of a W UMa type binary system BQ Ari was performed. Light curve analysis was performed using Wilson-Devinney (W-D) code combined with a Monte Carlo (MC) ...
Cylindrically symmetric unimodular f(R) black holes
(World Scientific Publishing, 2021)
In this paper, we examine massless scalar field by using unimodular f(R) theory. It is taken into account unimodular and cylindrically symmetric spacetime which provides convenience in researching black hole. The field ...
Axial-vector nucleon-to-delta transition form factors using the complex-mass renormalization scheme
(American Physical Society, 2021)
We investigate the axial-vector nucleon-to-delta transition form factors in the framework of relativistic baryon chiral perturbation theory at the one-loop order using the complex-mass renormalization scheme. We determine ...
On the zero point constant of the bolometric correction scale
(Oxford University Press, 2021)
Arbitrariness attributed to the zero-point constant of the V-band bolometric corrections (BCV) and its relation to ‘bolometric magnitude of a star ought to be brighter than its visual magnitude’ and ‘bolometric corrections ...
