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Hunting the parent of the orphan stream: Identifying stream members from low-resolution spectroscopy

Casey, Andrew; Da Costa, Gary; Keller, Stefan; Maunder, Elizabeth


We present candidate K-giant members in the Orphan Stream that have been identified from low-resolution data taken with the AAOmega spectrograph on the Anglo-Australian Telescope. From modest signal-to-noise spectra and independent cuts in photometry, kinematics, gravity, and metallicity we yield self-consistent, highly probable stream members. We find a revised stream distance of 22.5 ± 2.0 kpc near the celestial equator and our kinematic signature peaks at V GSR = 82.1 ± 1.4 km s-1. The...[Show more]

CollectionsANU Research Publications
Date published: 2013
Type: Journal article
Source: Astrophysical Journal, The
DOI: 10.1088/0004-637X/764/1/39
Access Rights: Open Access


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