Results 41 to 50 of about 11,728,534 (352)
Fundamental Parameters of Cepheids: Masses and Multiplicity [PDF]
, 2009 Masses determined from classical Cepheids in binary systems are a primary test of both pulsation and evolutionary calculations. The first step is to determine the orbit from ground-based radial velocities.
Joyce Ann Guzik +2 more
core +2 more sources
Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer [PDF]
, 2017 We present the fundamental properties of 87 stars based on angular diameter measurements from the Navy Precision Optical Interferometer, 36 of which have not been measured previously using interferometry.
E. Baines +7 more
semanticscholar +1 more source
Fundamental Parameters of the W Serpentis Stars [PDF]
International Astronomical Union Colloquium, 1989 AbstractApplication of digital cross-correlation spectroscopy to the spectra of the W Serpentis binaries SX Cas and RX Cas has allowed an accurate determination of the orbits and rotations of the (mass-losing) K-subgiant secondary components. The distortion of the primary radial-velocity curves due to the influence of the prominent accretion disks in ...
J. Andersen, B. Nordström
openaire +1 more source
Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗ [PDF]
Classical and quantum gravity, 2022 Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime.
S. Vagnozzi +3 more
semanticscholar +1 more source
FUNDAMENTAL PARAMETERS AND SPECTRAL ENERGY DISTRIBUTIONS OF YOUNG AND FIELD AGE OBJECTS WITH MASSES SPANNING THE STELLAR TO PLANETARY REGIME [PDF]
, 2015 We combine optical, near-infrared, and mid-infrared spectra and photometry to construct expanded spectral energy distributions for 145 field age (>500 Myr) and 53 young (lower age estimate
J. Filippazzo +5 more
semanticscholar +1 more source
Analysis of Interstellar Extinction towards the Hypergiant Cyg OB2 No. 12
Open Astronomy, 2016 The Cyg OB2 stellar association hosts an entire zoo of unique objects, and among them – an enigmatic star Cyg OB2 No. 12 (Schulte 12, MT 304). MT 304 is enigmatic not only due to its highest luminosity (according to various estimates, it is one of the ...
Maryeva O. V. +3 more
doaj +1 more source
Fundamental Parameters of Cepheids [PDF]
International Astronomical Union Colloquium, 1985 In the two centuries since the discovery of δ Cephei and η Aquilae, the study of Cepheids, and of pulsating stars in general, has become a very important field in astronomy. The usefulness of Cepheids, both as distance indicators and as test objects for stellar astrophysics, has been amply demonstrated, and if one just looks at the flood of papers on ...
openaire +1 more source
Solar astrophysical fundamental parameters [PDF]
SPIE Proceedings, 2014 The accurate determination of the solar photospheric radius has been an important problem in astronomy for many centuries. From the measurements made by the PICARD spacecraft during the transit of Venus in 2012, we obtained a solar radius of 696,156±145 kilometres. This value is consistent with recent measurements carried out atmosphere.
Meftah, Mustapha +2 more
openaire +2 more sources
Fundamental parameters and infrared excesses of Tycho–Gaia stars [PDF]
, 2017 Effective temperatures and luminosities are calculated for 1,475,921 Tycho-2 and 107,145 Hipparcos stars, based on distances from Gaia Data Release 1. Parameters are derived by comparing multi-wavelength archival photometry to BT-Settl model atmospheres.
I. McDonald, A. Zijlstra, R. Watson
semanticscholar +1 more source
Wide Field Multicolor CCD Photometry in the Vicinity of the Open Cluster King 7
Open Astronomy, 2010 We present the results of CCD photometry in the seven-color Vilnius system for 1549 stars down to V ∼16 mag in a 1.5 square degree field around the cluster King 7, at the Perseus and Camelopardalis border.
Zdanavičius J. +3 more
doaj +1 more source