The Barium Odd Isotope Fractions in Seven Ba Stars
Universe, 2022 Based on the spectra with high resolution and a high signal-to-noise ratio, we investigate the enrichment history of the s-process element in seven barium (Ba) stars by measuring their Ba odd isotope fraction.
Fang Wen +5 more
doaj +1 more source
Variability of the HeI5876 A line in early type chemically peculiar stars [PDF]
, 1998 Chemically peculiar stars present spectral and photometric variability with a single period. In the oblique rotator model, the non homogeneous distribution of elements on the stellar surface is at the origin of the observed variations.
Catalano, F. A. +2 more
core +2 more sources
Subaru and Salt Spectroscopy of Chemically Peculiar Hot Subdwarfs
Open Astronomy, 2017 The majority of hot subdwarfs lie on or close to the helium main-sequence. Many have hydrogen-rich surfaces, but a substantial fraction of the hotter subdwarfs have hydrogen-depleted or hydrogen-deficient surfaces. Amongst the former, three were known to
Jeffery C. Simon +4 more
doaj +1 more source
An Ap Star Catalog Based on LAMOST DR9
The Astrophysical Journal, 2023 We present a sample of 2700 Ap stars in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR9 catalog. The candidates are first selected to be in a temperature range typical of Ap stars by using the BP − RP color index from Gaia DR3.
Fangfei Shi +4 more
doaj +1 more source
Summary of Eighth Meeting on Hot Subdwarfs and Related Objects
Open Astronomy, 2017 Subjects discussed during the Eighth Meeting on Hot Subdwarfs and Related Objects are summarised. In particular, a succinct presentation is given of challenges to stellar evolution arising from recent observations.
Lynas-Gray Anthony Eugene
doaj +1 more source
Fundamental parameters and evolutionary status of the magnetic chemically peculiar stars HD 188041 (V1291 Aquilae), HD 111133 (EP Virginis), and HD 204411: spectroscopy versus interferometry [PDF]
Monthly notices of the Royal Astronomical Society, 2019 The determination of fundamental parameters of stars is one of the main tasks of astrophysics. For magnetic chemically peculiar stars, this problem is complicated by the anomalous chemical composition of their atmospheres, which requires special ...
Anna Romanovskaya +6 more
semanticscholar +1 more source
The CoRoT chemical peculiar target star HD 49310 [PDF]
Astronomy & Astrophysics, 2015 Context: The magnetic chemically peculiar (CP) stars of the upper main sequence are well-suited laboratories for investigating the influence of local magnetic fields on the stellar surface because they produce inhomogeneities (spots) that can be investigated in detail as the star rotates.
Paunzen, Ernst +4 more
openaire +2 more sources
Global properties of the light curves of magnetic, chemically peculiar stars as a testbed for the existence of dipole-like symmetry in surface structures [PDF]
Astronomy & Astrophysics, 2019 Context. Magnetic, chemically peculiar stars are known for exhibiting surface abundance inhomogeneities (chemical spots) that lead to photometric and spectroscopic variability with the rotation period.
M. Jagelka +3 more
semanticscholar +1 more source
The 5200-Å flux depression of chemically peculiar stars – II. The cool chemically peculiar and λ Bootis stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2004 After establishing the synthetic ?a photometric system in the first paper of this series, we now present model atmospheres computed with individual abundances for a representative sample of chemically peculiar (CP) stars and either confirm or redetermine their input parameters through comparisons with photometric, spectrophotometric and high-resolution
Kupka, Friedrich +3 more
openaire +2 more sources
Asteroseismology of chemically peculiar stars [PDF]
Communications in Asteroseismology, 2009 Pulsational variability is observed in several types of main sequence stars with anomalous chemical abundances. In this contribution I summarize the relationship between pulsations and chemical peculiarities, giving special emphasis to rapid oscillations in magnetic Ap stars.
openaire +2 more sources