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Title: Chemical compositions and kinematics of the Hercules stream
Authors: Ramya, P
Reddy, B. E
Lambert, D. L
Musthafa, M. M
Keywords: Stars: abundances;Stars: moving groups;Galaxy: kinematics and dynamics;Galaxy: disc
Issue Date: 1-Aug-2016
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 460, No. 2, pp. 1356-1370
Abstract: An abundance analysis is reported of 58 K giants identified by Famaey et al. (2005) as highly probable members of the Hercules stream selected from stars north of the celestial equator in the Hipparcos catalogue. The giants have compositions spanning the interval [Fe/H] from −0.17 to +0.42 with a mean value of +0.15 and relative elemental abundances [El/Fe] representative of the Galactic thin disc. Selection effects may have biassed the selection from the Hipparcos catalogue against the selection of metal-poor stars. Our reconsideration of the recent extensive survey of FG dwarfs which included metal-poor stars (Bensby et al. 2014) provides a [Fe/H] distribution for the Hercules stream which is similar to that from the 58 giants. It appears that the stream is dominated by metal-rich stars from the thin disc. Suggestions in the literature that the stream includes metal-poor stars from the thick disc are discussed.
Description: Restricted Access
ISSN: 1365-2966
???metadata.dc.rights???: © Royal Astronomical Society
Appears in Collections:IIAP Publications

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