Results 61 to 70 of about 5,135 (186)
The Astrophysical Journal Supplement SeriesModern tools for modeling stellar evolution, such as the Modules for Experiments in Stellar Astrophysics, offer state-of-the-art implementations of stellar theories.
O. Ziółkowska +4 more
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V659 Cen: System Members Updated
The Astronomical JournalV659 Cen is a classical Cepheid which is part of a multiple system. Previous observations have shown that a hot companion dominates an ultraviolet spectrum and a cooler main-sequence star dominates an XMM-Newton spectrum. The Hubble Space Telescope Space
Nancy Remage Evans +10 more
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The Astronomical JournalThe Draco Dwarf spheroidal (dSph) galaxy is one of the nearest and the most dark-matter-dominated satellites of the Milky Way. We obtained multiepoch near-infrared (NIR, JHK _s ) observations of the central region of Draco dSph covering a sky area of ∼21′
Anupam Bhardwaj +6 more
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Self-consistent Nonlinear Classical Cepheid Pulsations during Stellar Evolution with MESA
The Astrophysical JournalWe extend the time-dependent convection (TDC) treatment in MESA by introducing eddy-viscous dissipation. This software change brings MESA-TDC into closer alignment with the radial stellar pulsation (RSP) framework of the MESA-RSP module.
Ebraheem Farag +7 more
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Non-particle dark matter from Hubble parameter
European Physical Journal C: Particles and Fields, 2019 The measurements of the Hubble parameter using the cosmic microwave background radiation appear to be inconsistent with the measurements of this parameter using Cepheid variable stars.
Nikodem J. Popławski
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FREQUENCY ANALYSIS OF PHOTOGRAPHIC OBSERVATIONS OF PULSATING STARS
Odessa Astronomical Publications, 2017 The Fourier analysis are performed for photoelectric and photographic B-observations (Goranskij and Shugarov, 1979) of RR Lyrae star RW Ari. Besides the main frequency f0 and four its first harmonics two more frequencies are found: f1 =f0 /3 and f2 =0 ...
V. P. Bezdenezhnyi
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Amplitude Effect in Cepheid Variables [PDF]
Nature, 1945 IN the interesting review1 of the pulsation theory in his George Darwin Lecture of 1943 before the Royal Astronomical Society, Prof. S. Rosseland has indicated the importance of unharmonic oscillations in explaining the Cepheid characteristics, and brought out the effect of the amplitude in lengthening the pulsational period, pointed out by Kluyver2 in
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The Astrophysical JournalPulsating stars are universally recognized as precise distance indicators and tracers of stellar populations. Their variability, combined with well-defined relationships between pulsation properties and intrinsic evolutionary parameters such as ...
Giulia De Somma +3 more
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A Cepheid is No More: Hubble’s Variable 19 in M33
The Astrophysical Journal, 2001 We report on the remarkable evolution in the light curve of a variable star discovered by Hubble (1926) in M33 and classified by him as a Cepheid. Early in the 20th century, the variable, designated as V19, exhibited a 54.7 day period, an intensity-weighted mean B magnitude of 19.59+/-0.23 mag, and a B amplitude of 1.1 mag.
Macri, L. M. +2 more
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Classification of Periodic Variable Stars from TESS
The Astrophysical Journal Supplement SeriesThe number of known periodic variable stars has increased rapidly in recent years. As an all-sky transit survey, the Transiting Exoplanet Survey Satellite (TESS) plays an important role in detecting low-amplitude variable stars.
Xinyi Gao +3 more
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