A statistical analysis of the late-type stellar content in the Andromeda Halo

Koch, Andreas and Rich, R. Michael (2010) A statistical analysis of the late-type stellar content in the Andromeda Halo. The Astronomical Journal, 139 (6). pp. 2279-2288. ISSN 0004-6256

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Abstract

We present a statistical characterization of the carbon-star to M-giant (C/M) ratio in the halo of M31. Based on the application of pseudo-filter bandpasses to our Keck/DEIMOS spectra, we measure the 81 – 77 color index of 1288 stars in the giant stellar stream and in halo fields out to large distances. From this well-established narrow-band system, supplemented by V – I colors, we find only a low number (five in total) of C-star candidates. The resulting low C/M ratio of 10% is consistent with the values in the M31 disk and inner halo from the literature. Although our analysis is challenged by small number statistics and our sample selection, there is an indication that the oxygen-rich M-giants occur in similar number throughout the entire halo. We also find no difference in the C-star population of the halo fields compared to the giant stream. The very low C/M ratio is at odds with the observed low metallicities and the presence of intermediate-age stars at large radii. Our observed absence of a substantial carbon-star population in these regions indicates that the (outer) M31 halo cannot be dominated by the debris of disk-like or Small-Magellanic-Cloud-type galaxies, but rather resemble the dwarf elliptical NGC 147.

Item Type: Journal Article
Journal or Publication Title: The Astronomical Journal
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 83400
Deposited By: ep_importer_pure
Deposited On: 02 Dec 2016 15:20
Refereed?: Yes
Published?: Published
Last Modified: 01 Jan 2020 10:06
URI: https://eprints.lancs.ac.uk/id/eprint/83400

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