منابع مشابه
Magnetic Activities in Outer Atmosphere of the RS CVn-type Binary SZ Psc
Abstract. We present the results of time-resolved high-resolution spectroscopic observations of the very active RS CVn-type star SZ Psc, obtained during two consecutive observing nights in 2011 October. Chromospheric activity indicators (including the Hα, Na i D1, D2, He i D3, and Hβ lines) formed at different atmospheric heights were analyzed using the spectral subtraction technique, which sho...
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Context. The stellar system δVel contains the brightest eclipsing binary in the southern sky (δVel A), and a nearby third star located ≈ 0.6′′ away (δVel B). The proximity of δVel B (usable as a reference) makes it a particularly well-suited target to detect the astrometric displacement of the center of light of the eclipsing pair. Aims. We obtained NACO astrometric observations with two goals:...
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N-body + hydrodynamic simulations of galaxy clusters are used to demonstrate a correlation between galaxy cluster mass and the strength of the Sunyaev–Zel’dovich (SZ) effect induced by the cluster. The intrinsic scatter in the correlaton is larger than seen in the cluster mass — X–ray temperature correlation, but smaller than seen in the correlation between mass (or temperature) and X–ray lumin...
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Spectral clustering algorithm has been shown to be more effective in finding clusters than some traditional algorithms such as k-means. However, spectral clustering suffers from a scalability problem in both memory use and computational time when the size of a data set is large. To perform clustering on large data sets, we investigate two representative ways of approximating the dense similarit...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1958
ISSN: 0004-6256
DOI: 10.1086/107751