44 citations · 146 across the 8 of their papers we have counts for
8 papers
The Flattening Metallicity Gradient in the Milky Way's Thin Disk
John J. Vickers, Juntai Shen, Zhao-Yu Li
We calculate the ages, orbits and phase-space coordinates for a sample of 4 million LAMOST and Gaia stars. The ages are crossmatched and compared with values from two other p…
A LAMOST BHB Catalog and Kinematics Therein I: Catalog and Halo Properties
John J. Vickers, Zhao-Yu Li, Martin C. Smith +1
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 spectrosc…
The Lives of Stars: Insights From the TGAS-RAVE-LAMOST Dataset
John J. Vickers, Martin C. Smith
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 s…
A Global Correction to PPMXL Proper Motions
John J. Vickers, Siegfried Roeser, Eva K. Grebel
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 obje…
LAMOST 1: A Disrupted Satellite in the Constellation Draco
John J. Vickers, Martin C. Smith, Yonghui Hou +2
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…
Red Runaways: Hypervelocity Stars, Hills Ejecta and Other Outliers in the F-M Star Regime
John J. Vickers, Martin C. Smith, Eva K. Grebel
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.…
A Stellar Population Synthesis Model for the Study of Ultraviolet Star Counts of the Galaxy
Ananta C. Pradhan, D. K. Ojha, A. C. Robin +2
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 investi…
Identifying Blue Horizontal Branch Stars Using the z Filter
John J. Vickers, Eva K. Grebel, Avon P. Huxor
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…