Zobrazeno 1 - 10
of 357
pro vyhledávání: '"VICKERS, JOHN"'
We calculate the ages, orbits and phase-space coordinates for a sample of $\sim$4 million LAMOST and Gaia stars. The ages are crossmatched and compared with values from two other popular age catalogs which derive the ages using different methods. Of
Externí odkaz:
http://arxiv.org/abs/2109.09250
We collect a sample of stars observed both in LAMOST and Gaia which have colors implying a temperature hotter than 7000 K. We train a machine learning algorithm on LAMOST spectroscopic data which has been tagged with stellar classifications and metal
Externí odkaz:
http://arxiv.org/abs/2102.09183
Autor:
Vickers, John Edward
Particle behaviour and the influence of particles in multiphase turbulent flows has been examined. The effects of particle size, density and volume fraction on both the particle and fluid phases of pipe flows and impinging jets have been measured. Th
Externí odkaz:
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.739769
Autor:
Vickers, John J., Smith, Martin C.
In this paper we investigate how the chemical and kinematic properties of stars vary as a function of age. Using data from a variety of photometric, astrometric and spectroscopic surveys, we calculate the ages, phase space information and orbits for
Externí odkaz:
http://arxiv.org/abs/1805.02332
Autor:
Armstrong, Mark1 (AUTHOR), Vickers, John2 (AUTHOR)
Publikováno v:
Journal of Political Economy. Oct2023, Vol. 131 Issue 10, p2645-2665. 21p.
Autor:
Vickers, John
Publikováno v:
In International Journal of Industrial Organization December 2021 79
In this paper we notice that extragalactic sources seem to have non-zero proper motions in the PPMXL proper motion catalog. We collect a large, all-sky sample of extragalactic objects and fit their reported PPMXL proper motions to an ensemble of sphe
Externí odkaz:
http://arxiv.org/abs/1602.08868
Using LAMOST spectroscopic data, we find a strong signal of a comoving group of stars in the constellation of Draco. The group, observed near the apocenter of its orbit, is 2.6 kpc from the Sun with a metallicity of -0.64 dex. The system is observed
Externí odkaz:
http://arxiv.org/abs/1512.05090