Hayden, MR, Holtzman, JA, Bovy, J, Nidever, DL, Bird, JC, Weinberg, DH, Johnson, JA, Andrews, BH, Majewski, SR, García Pé Rez, AE, Hearty, FR, O'Connell, R, Skrutskie, M, Wilson, JC, Prieto, CA, García-Herńandez, DA, Zamora, O, Anders, F, Chiappini, C, Minchev, I et al, Steinmetz, M, Beers, TC, Bizyaev, D, Pan, K, Girardi, L, Cunha, K, Smith, V, Frinchaboy, P, Harding, P, Schneider, DP, Mészáros, S, Robin, AC, Schiavon, RP, Schultheis, M, Shetrone, M and Zasowski, G (2015) CHEMICAL CARTOGRAPHY with APOGEE: METALLICITY DISTRIBUTION FUNCTIONS and the CHEMICAL STRUCTURE of the MILKY WAY DISK. Astrophysical Journal, 808 (2). pp. 1-18. ISSN 0004-637X

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Abstract

Using a sample of 69,919 red giants from the SDSS-III/APOGEE Data Release 12, we measure the distribution of stars in the [/Fe] versus [Fe/H] plane and the metallicity distribution functions (MDFs) across an unprecedented volume of the Milky Way disk, with radius 3 < R < 15 kpc and height kpc. Stars in the inner disk (R < 5 kpc) lie along a single track in [/Fe] versus [Fe/H], starting with -enhanced, metal-poor stars and ending at [/Fe] ∼ 0 and [Fe/H] ∼ +0.4. At larger radii we find two distinct sequences in [/Fe] versus [Fe/H] space, with a roughly solar- sequence that spans a decade in metallicity and a high- sequence that merges with the low- sequence at super-solar [Fe/H]. The location of the high- sequence is nearly constant across the disk.

Item Type:	Article
Uncontrolled Keywords:	0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects:	Q Science > QB Astronomy
Divisions:	Astrophysics Research Institute
Publisher:	American Astronomical Society
Date Deposited:	11 Jan 2016 10:30
Last Modified:	04 Sep 2021 13:41
DOI or ID number:	10.1088/0004-637X/808/2/132
URI:	https://researchonline.ljmu.ac.uk/id/eprint/2564

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