Results 21 to 30 of about 2,816 (255)
Symmetries in Stellar, Galactic, and Extragalactic Astronomy [PDF]
, 2021 Examples are presented for appearance of geometric symmetry in the shape of various astronomical objects and phenomena. Usage of these symmetries in astrophysical and extragalactic research is also discussed.
openaire +2 more sources
Hot super-Earths stripped by their host stars
Nature Communications, 2016 Theory predicts a deficit of super-Earth sized planets, which orbit close to their host star. Here, Lundkvist et al. use data from the NASA Kepler mission to show that this deficit is also seen in observations, thereby providing new insight into ...
M. S. Lundkvist +28 more
doaj +1 more source
What asteroseismology can do for exoplanets
EPJ Web of Conferences, 2015 We describe three useful applications of asteroseismology in the context of exoplanet science: (1) the detailed characterisation of exoplanet host stars; (2) the measurement of stellar inclinations; and (3) the determination of orbital eccentricity from ...
Van Eylen Vincent +14 more
doaj +1 more source
The Astrophysical Journal, 2023 We present a multiwavelength study of stellar flares on primarily G-type stars using overlapping time domain surveys in the near-ultraviolet (NUV) and optical regimes. The NUV (the Galaxy Evolution Explorer; GALEX) and optical (Kepler) wavelength domains
C. E. Brasseur +3 more
doaj +1 more source
Galaxies, 2021 Radio astronomy commenced in earnest after World War II, with Australia keenly engaged through the Council for Scientific and Industrial Research. At this juncture, Australia’s Commonwealth Solar Observatory expanded its portfolio from primarily studying
Alister W. Graham +4 more
doaj +1 more source
Lithium in Turnoff Stars in the Globular Cluster M5: A Quest for Primordial Lithium
The Astrophysical Journal, 2023 The light element lithium is formed by nucleosynthesis during the Big Bang. Its abundance can help to define the parameters of the early Universe. To find this primordial value, it is necessary to determine Li abundances in the oldest stars because it is
Ann Merchant Boesgaard +1 more
doaj +1 more source
An Outline of Stellar Astronomy [PDF]
Nature, 1948 THIS little book is designed, as the author unassumingly states, for readers who have "slightly more knowledge than that necessary for perusal of 'popular' astronomical literature". It is, in fact, a useful summary, remarkably complete for its size, of the present state of knowledge, and there will be many genuine astronomers, both amateur and ...
openaire +1 more source
Extragalactic stellar astronomy with the brightest stars in the universe [PDF]
Physica Scripta, 2007 AbstractA supergiants are objects in transition from the blue to the red (and vice versa) in the uppermost HRD. They are the intrinsically brightest “normal” stars at visual light with absolute visual magnitudes up to −9. They are ideal to study young stellar populations in galaxies beyond the Local Group to determine chemical composition and evolution,
Kudritzki, Rolf +3 more
openaire +4 more sources
The γ Dor stars as revealed by Kepler: A key to reveal deep-layer rotation in A and F stars
EPJ Web of Conferences, 2017 The γ Dor pulsating stars present high-order gravity modes, which make them important targets in the intermediate-and low-mass main-sequence region of the Hertzsprung-Russell diagram. Whilst we have only access to rotation in the envelope of the Sun, the
Salmon S. J. A. J. +4 more
doaj +1 more source
TOI-1333Ab is on a well-aligned orbit
Astronomy & AstrophysicsContext. Spin-orbit obliquity measurements of hot-Jupiter systems constrain giant planet migration and tidal evolution. In binary systems, combining stellar obliquities with the orbit-orbit angle (γ) between the planetary and stellar companion orbits ...
Knudstrup E. +4 more
doaj +1 more source