Charli in Japan
Charli Sakari
PhD, 2014
Postdoctoral Research Associate
University of Washington

sakaricm [at] u.washington.edu


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About me
I am a postdoctoral researcher in Astronomy at the University of Washington where I work with Dr. George Wallerstein.  My research is primarily focused on determining chemical abundances of stars through spectroscopy.  I obtained my PhD in 2014 from the University of Victoria, where I was under the supervision of Dr. Kim Venn.

In addition to astronomy research, I am very interested in teaching and outreach.  Though I am not currently teaching classes, resources from my previous classes and trainings can be found on my teaching page.





Contact me
 
I am currently located at the University of Washington, in the Astronomy department.  I can be contacted via email:
sakaricm [at] u.washington.edu



 

 
 
 




Research Spotlight
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Image from Robert Gendler;
http://apod.nasa.gov/apod/ap150830.html

Infrared High-Resolution Integrated Light Spectral Analyses of M31 Globular Clusters from APOGEE

Chemical abundances are presented for 25 M31 globular clusters (GCs), based on moderately high resolution (R = 22, 500) H-band integrated light spectra from the Apache Point Observatory Galactic Evolution Experiment (APOGEE). Infrared spectra offer lines from new elements, of different strengths, and at higher excitation potentials compared to the optical. Integrated abundances of C, N, and O are derived from CO, CN, and OH molecular features, while Fe, Na, Mg, Al, Si, K, Ca, and Ti abundances are derived from atomic features. These abundances are compared to previous results from the optical, demonstrating the validity and value of infrared integrated light analyses.  The CNO abundances are consistent with typical tip of the red giant branch stellar abundances, but are systematically offset from optical, Lick index abundances. With a few exceptions, the other abundances agree between the optical and the infrared within the 1σ uncertainties. The first integrated K abundances are also presented, and demonstrate that K tracks the α-elements. The combination of infrared and optical abundances allows better determinations of GC properties, and enables probes of the multiple populations in extragalactic GCs. In particular, the integrated effects of the Na/O anticorrelation can be directly examined for the first time.

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