Results 51 to 60 of about 440,939 (238)
Stellar Parameters for HD 69830, a Nearby Star with Three Neptune Mass Planets and an Asteroid Belt [PDF]
, 2014 We used the CHARA Array to directly measure the angular diameter of HD 69830, home to three Neptune mass planets and an asteroid belt. Our measurement of 0.674+/-0.014 milli-arcseconds for the limb-darkened angular diameter of this star leads to a ...
Beichman, Charles A. +11 more
core +4 more sources
Extremal properties of the distance spectral radius of hypergraphs
, 2020 The distance spectral radius of a connected hypergraph is the largest eigenvalue of its distance matrix. The unique hypertrees with minimum distance spectral radii are determined in the class of hypertrees of given diameter, in the class of hypertrees of
Yanna Wang, Bo Zhou
semanticscholar +1 more source
k路覆盖图的新充分条件(New sufficient conditions on k -path-coverable graphs)
Zhejiang Daxue xuebao. Lixue ban, 2019 Let G be a simple connected graph of order n. A graph G is k-path-coverable if its vertex set V ( G ) can be covered by kor fewer vertex-disjoint paths. In this paper, we give some new sufficient conditions for a graph to be k-path-coverable in terms of ...
JIAHuicai(贾会才)
doaj +1 more source
Mathematics, 2022 This study focuses on tensor Z-eigenvalue localization and its application in the geometric measure of entanglement for multipartite quantum states. A new Z-eigenvalue localization theorem and the bounds for the Z-spectral radius are derived, which are ...
Liang Xiong +3 more
doaj +1 more source
Absolute dimensions of eclipsing binaries. XXIV, The Be star system DW Carinae, a member of the open cluster Collinder 228 [PDF]
, 2006 Context. The study of detached eclipsing binaries which are members of stellar clusters is is a powerful way of determining the properties of the cluster and of constraining the physical ingredients of theoretical stellar evolutionary models.
Clausen, J. V., Southworth, J. (John)
core +1 more source
On distance signless Laplacian spectrum and energy of graphs
Electronic Journal of Graph Theory and Applications, 2018 The distance signless Laplacian spectral radius of a connected graph G is the largest eigenvalue of the distance signless Laplacian matrix of G, defined as DQ(G) = Tr(G) + D(G), where D(G) is the distance matrix of G and Tr(G) is the diagonal ...
Abdollah Alhevaz +2 more
doaj +1 more source
Constraining the neutron star equation of state using quiescent low-mass X-ray binaries
, 2007 Chandra or XMM-Newton observations of quiescent low-mass X-ray binaries can provide important constraints on the equation of state of neutron stars.
A. Cumming +4 more
core +1 more source
X-ray variability and spectral scaling: a measure of BLR sizes in AGN [PDF]
, 1997 We apply a new method of determination of the size of the broad emission-line region (BLR) in active galactic nuclei. This method relates the radius of the broad-line region of AGN to the soft X-ray luminosity and spectral index.
A Wandel, BM Peterson, M Rees, Th Boller
core +2 more sources
The normalized distance Laplacian
Special Matrices, 2021 The distance matrix 𝒟(G) of a connected graph G is the matrix containing the pairwise distances between vertices. The transmission of a vertex vi in G is the sum of the distances from vi to all other vertices and T(G) is the diagonal matrix of ...
Reinhart Carolyn
doaj +1 more source
Experimental Observation of the Spectral Gap in Microwave n-Disk Systems
, 2013 Symmetry reduced three-disk and five-disk systems are studied in a microwave setup. Using harmonic inversion the distribution of the imaginary parts of the resonances is determined.
Barkhofen, S. +5 more
core +3 more sources