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pro vyhledávání: '"Vickers, John J."'
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 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
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
In this paper we analyze a sample of metal-rich (>-0.8 dex) main sequence stars in the extended solar neighborhood, investigating kinematic outliers from the background population. The data, which are taken from the Sloan Digital Sky Survey, are kine
Externí odkaz:
http://arxiv.org/abs/1506.03153
GALEX, the first all sky imaging UV satellite, has imaged a large part of the sky providing an excellent opportunity for studying UV star counts. The aim of our study is to investigate in detail the observed UV star counts obtained by GALEX vis-a-vis
Externí odkaz:
http://arxiv.org/abs/1403.2561
In this paper we present a new method for selecting blue horizontal branch (BHB) candidates based on color-color photometry. We make use of the Sloan Digital Sky Survey z band as a surface gravity indicator and show its value for selecting BHB stars
Externí odkaz:
http://arxiv.org/abs/1201.4571
Autor:
Vickers, John J.
This dissertation discusses various techniques for studying the structure of the Milky Way via the use of stellar tracers. One of the most widely used stellar tracers is blue horizontal branch stars, which are prized for their predictable and substan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dfed494c05150e69635ed6cc01ee69ba
http://archiv.ub.uni-heidelberg.de/volltextserver/17761/
http://archiv.ub.uni-heidelberg.de/volltextserver/17761/
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