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Hunting the Parent of the Orphan Stream II: The First High-Resolution Spectroscopic Study
Andrew Casey, Stefan Keller, Gary Da Costa +2
We present the first high-resolution spectroscopic study on the Orphan Stream for five stream candidates, observed with the Magellan Inamori Kyocera Echelle (MIKE) spectrograph on…
The Aquarius Co-Moving Group is Not a Disrupted Classical Globular Cluster
Andrew R. Casey, Stefan Keller, Alan Alves-Brito +8
We present a detailed analysis of high-resolution, high S/N spectra for 5 Aquarius stream stars observed with the MIKE spectrograph on the Magellan Clay telescope. Our sample repre…
Astropy: A Community Python Package for Astronomy
The Astropy Collaboration, Thomas P. Robitaille, Erik J. Tollerud +42
We present the first public version (v0.2) of the open-source and community-developed Python package, Astropy. This package provides core astronomy-related functionality to the com…
The 300km/s stellar stream near Segue 1: Insights From high-resolution spectroscopy of its brightest star
Anna Frebel, Ragnhild Lunnan, Andrew R. Casey +3
We present a chemical abundance analysis of 300S-1, the brightest likely member star of the 300 km/s stream near the faint satellite galaxy Segue 1. From a high-resolution Magellan…
Deriving Stellar Effective Temperatures of Metal-Poor Stars with the Excitation Potential Method
Anna Frebel, Andrew R. Casey, Heather R. Jacobson +1
It is well established that stellar effective temperatures determined from photometry and spectroscopy yield systematically different results. We describe a new, simple method to c…
Hunting the Parent of the Orphan Stream: Identifying Stream Members from Low-Resolution Spectroscopy
Andrew R. Casey, Gary Da Costa, Stefan C. Keller +1
We present candidate K-giant members in the Orphan Stream which have been identified from low-resolution data taken with the AAOmega spectrograph on the Anglo-Australian Telescope.…