Results 11 to 20 of about 3,957,653 (321)
A Main Sequence for Quasars [PDF]
Frontiers in Astronomy and Space Sciences, 2018 The last 25 years saw a major step forward in the analysis of optical and UV spectroscopic data of large quasar samples. Multivariate statistical approaches have led to the definition of systematic trends in observational properties that are the basis of
Paola Marziani +9 more
doaj +13 more sources
Entropy Production of Main-Sequence Stars [PDF]
Entropy, 2015 The entropy production (inside the volume bounded by a photosphere) of main-sequence stars is calculated based on B–V photometry data. The entropy-production distribution function and the dependences of entropy production on temperature and luminosity ...
Leonid M. Martyushev, Sergey N. Zubarev
doaj +4 more sources
Pre-main-sequence Lithium Depletion [PDF]
, 2004 In this review I briefly discuss the theory of pre-main-sequence (PMS) Li depletion in low-mass (0 ...
A. Ford +35 more
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The Pre--Main-Sequence of A-type stars [PDF]
Proceedings of the International Astronomical Union, 2004 Young A-type stars in the pre--main-sequence (PMS) evolutionary phase are particularly interesting objects since they cover the mass range (1.5-4 solar ma sses) which is most sensitive to the internal conditions inherited during the protostellar phase ...
Marconi, Marcella, Palla, Francesco
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The Ages of Pre-main-sequence Stars [PDF]
Monthly Notices of the Royal Astronomical Society, 1998 The position of pre-main-sequence or protostars in the Hertzsprung--Russell diagram is often used to determine their mass and age by comparison with pre-main-sequence evolution tracks.
Alexander +45 more
core +4 more sources
Abundances on the Main Sequence of Omega Centauri [PDF]
The Astrophysical Journal, 2007 Abundance ratios of carbon, nitrogen and strontium relative to iron, calculated using spectrum synthesis techniques, are given for a sample of main sequence and turnoff stars that belong to the globular cluster omega Centauri.
Alonso A. +14 more
core +5 more sources
Asteroseismology of stars on the upper main sequence [PDF]
Proceedings of Frank N. Bash Symposium 2011: New Horizons in Astronomy — PoS(Bash11), 2012 I review the properties of pulsators located on the upper main sequence in the HR diagram and discuss asteroseismic inferences on the internal structure of stars of spectral type A and B.
Lenz, P.
core +2 more sources
The Blazar Main Sequence [PDF]
The Astrophysical Journal, 2002 26 pages, 2 eps figures, revised version #2, accepted for pubblication in ...
Cavaliere, A., D'Elia, V.
openaire +4 more sources
The main sequence of star clusters [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 16 pages, 21 figures, accepted for publication in ...
Kupper, Andreas H. W. +2 more
openaire +5 more sources