Results 21 to 30 of about 873,650 (292)
Rapid Pulsations in Ap Stars [PDF]
International Astronomical Union Colloquium, 1995 AbstractThe rapidly oscillating Ap (roAp) stars are upper mainsequence stars that pulsate in non-radial p modes of high overtone. We present an observer’s overview of the roAp phenomenon and discuss significant developments since the last major observational reviews of Kurtz (1990a) and Matthews (1991).
Peter Martinez, D.W. Kurtz
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roAp STARS AS OBJECTS FOR ASTEROSEISMOLOGY
Odessa Astronomical Publications, 2017 To date the rapidly oscillating Ap (roAp) stars are one of the best-studied objects of the Main Sequence. There are reviewed the recent results for HD 99563 and γ Equ as examples of stars with stable and unstable oscillations.
T. N. Dorokhova, N. I. Dorokhov
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The Heterogeneity of Surfaces of Magnetic AP Stars [PDF]
Highlights of Astronomy, 1977 AbstractThe observations of spectrum-variability and light-variability of Ap stars are reviewed. It is shown that these variations are interpretable as due to the changing aspect of the spotted surface as the star rotates. It is stressed that we understand fairly well the geometry of the phenomenon but the physics is very far from being understood ...
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Pre-Main Sequence Ap Star LkHα 324/B in LDN 988 Star Forming Region
Universe, 2023 We present results of the investigation of the star LkHα 324/B, which belongs to the starforming dark cloud LDN 988. Based on high resolution spectroscopy, we determined its fundamental parameters as Teff=11,175±130 K, log(L*/L⊙)=1.87±0.07.
Ilya Potravnov +3 more
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ROTATIONAL VARIATION OF THE MAGNETIC FIELD OF Β CrB IN DIFFERENT SPECTRAL LINES
Odessa Astronomical Publications, 2008 The results of spectropolarimetic study of one of the coolest Ap-stars Β CrB are presented. It was shown that effective magnetic fields measured in different spectral lines and folded in phase with the rotational period of the star significantly differ ...
V. Butkovskaya +8 more
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The Astrophysical Journal, 2023 Kilonova spectra provide us with information of r -process nucleosynthesis in neutron star mergers. However, it is still challenging to identify individual elements in the spectra mainly due to the lack of experimentally accurate atomic data for heavy ...
Nanae Domoto +8 more
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NEWS FROM MT. DUSHAK-EREKDAG STATION OF ODESSA ASTRONOMICAL OBSERVATORY
Odessa Astronomical Publications, 2017 This report continues the series of articles about observations at the Mt. Dushak-Erekdag station of Astronomical Observatory, Odessa State University in Turkmenistan.
N. I. Dorokhov +3 more
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, 2008 The many peculiarities of Ap stars (not only chemical ones, but also magnetic field and slow rotation) may vary during the main-sequence evolution of these stars. We review here briefly the evidences found in the last thirty years for such evolution, with an emphasis on the more recent research.
North, P. L., Babel, J., Erspamer, D.
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Open Astronomy, 2003 HR1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of nonradial stellar pulsation. Prior observations showed a clear pattern of five modes with alternating frequency spacings of 33.3 μHz and 34.6 μHz, with a ...
Kurtz D. W. +43 more
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ON THE POSSIBLE NATURE OF Bp-Ap STARS: AN APPLICATION TO HD101065 and HR465
Odessa Astronomical Publications, 2007 We have proposed the new explanation of some magnetic chemically peculiar (MCP) stars anomalies, which is based on assumption that such stars can be the close binary systems with a secondary component being neutron star.
V. F. Gopka +2 more
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