Sten Hasselquist » Directory

Sten Hasselquist

Graduate Student NMSUAstronomy

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Biographical Info


I am interested in understanding how our Galaxy formed and evolved by analyzing the chemical abundance patterns of stellar populations across the Milky Way. I primarily use data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE).

I completed my B.A. in astronomy and physics in 2013 at the University of Virginia where I worked with Steve Majewski on SDSS APOGEE observations of the Sagittarius dwarf galaxy (Sgr).

My work with APOGEE carried over into graduate school at NMSU where I work with Jon Holtzman on improvements to the APOGEE data reduction pipeline, including the characterization of neutron-capture element lines in the APOGEE spectral region. I have published work on the detailed chemical abundance patterns of Sgr, and am currently working on studying the chemical abundance patterns of the Milky Way, with a focus on stellar ages from carbon and nitrogen abundances.


Selected Publications

APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy

Hasselquist, S. et al. 2017, The Astrophysical Journal, 845, 162H

Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window

Cunha, K., Smith, V., Hasselquist, S., et al. 2017, The Astrophysical Journal, 844, 145C

Identification of Neodymium in the Apogee H-Band Spectra

Hasselquist, S. et al. 2016, The Astrophysical Journal, 833, 81H

Discovery of a Dynamical Cold Point in the Heart of the Sagittarius dSph Galaxy with Observations from the APOGEE Project

Majewski, S., Hasselquist, S. et al. 2013, The Astrophysical Journal Letters, 777L, 13M


Selected Meetings Attended
  • APOGEE Meeting, Carnegie Observatories CA, February 2017
  • 229th AAS Meeting, Grapevine TX, January 2017
  • SDSS-IV Meeting, Madison WI, June 2016
Teaching and Outreach Activities

NMSU Outreach coordinator from 2014-2017.

Notable events I organized:

  • Partial Solar Eclipse, Fall 2014, public
  • Pluto flyby, Summer 2015, public
  • Mercury Transit, Spring 2016, public
  • Sierra Middle School Science Olympiad Training, Fall 2014 -Spring 2015, K-12