Me

Hi, my name is John Crooke and I'm a second year graduate student working towards my PhD in astronomy at CWRU. Before that, I attended Missouri State University as a member of the Honors College. During my time at MSU I majored in physics (astronomy/astrophysics track) and minored in mathematics and philosophy. Before graduating in 2014, I had the oppotunity to learn many valuable skills from working on research projects with Dr. Patterson for a year (Cepheid variables observed in person by me) and Dr. Reed for two years (asteroseismology of pulsating subdwarf-B stars observed using a ground-based robotic telescope and the Kepler Space Telescope) in the Physics, Astronomy, and Materials Science Department.

Research

In the summer of 2019 I began working with Prof. Morrison on a project to better understand the Galactic halo and to learn about its history. Previous work on the topic has focused on using the SEGUE K Giant Survey to provide phase-space data in order to determine substructure in the halo. With the release of Gaia DR2, many stars have more accurate astrometric measurements than ever before. It would make a great tool, then, to help expand upon the work done with the SEGUE K Giant Survey. That is where I come in; my goal is to use data from Gaia DR2 to help this ambitious goal. So far, I have been comparing results from Gaia DR2 to those presented by Morrison et al. in this 2016 paper about clusters observed with SEGUE. To see my progess feel free to click the links below.

Currently, I am no longer looking at clusters and am trying to apply the knowledge gained from them towards identifying populations of K giants and dwarfs. At this moment, I am looking specifcally at dwarfs and separating them into groups to look at their space motions and metallicities as a way to determine to which part of the galaxy they belong. The main research button below has more details.

Publications & Presentations

For a list of publications I am an author on and presentations I have
given at conferences please view the links below.

Teaching

This semester I am the teaching assistant for ASTR 101: Introduction to the Sun and Its Planets.

This introductory astronomy course describes our solar system of planets and how astronomers develop our physical understanding about the universe. Topics include the properties of the Sun and planets; the formation of the solar system and how the planets have evolved over time; asteroids, comets, and dwarf planets; and a comparison of our solar system with new planetary systems being found around other stars. This course has no pre-requisites.
For the Fall 2020 semester, class meets online via Zoom at 10:00-11:15am on Tuesdays and Thursdays. My office hours are on Wednesday and Thursday from 2:30-3:30pm. If those times don't work for you feel free to send me an email to scheudle a different time. For more information and Zoom links to class and office hours please visit the course's Canvas page.