Identifying High Metallicity M Giants at Intragroup Distances with SDSS

ASTRONOMICAL JOURNAL(2012)

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摘要
Tidal stripping and three-body interactions with the central supermassive black hole may eject stars from the Milky Way. These stars would comprise a set of "intragroup" stars that trace the past history of interactions in our galactic neighborhood. Using the Sloan Digital Sky Survey DR7, we identify candidate solar-metallicity red giant intragroup stars using color cuts that are designed to exclude nearby M and L dwarfs. We present 677 intragroup candidates that are selected between 300 kpc and 2Mpc, and are either the reddest intragroup candidates (M7-M10) or are L dwarfs at larger distances than previously detected.
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关键词
Galaxy: halo,Galaxy: stellar content,Local Group,stars: late-type
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