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Chemodynamics of the Milky Way. I. The first year of APOGEE data

Anders, F, Chiappini, C, Santiago, BX, Rocha-Pinto, HJ, Girardi, L, Costa, LND, Maia, MAG, Steinmetz, M, Minchev, I, Schultheis, M, Boeche, C, Miglio, A, Montalbán, J, Schneider, DP, Beers, TC, Cunha, K, Prieto, CA, Balbinot, E, Bizyaev, D, Brauer, DE, Brinkmann, J, Frinchaboy, PM, Pérez, AEG, Hayden, MR, Hearty, FR, Holtzman, J, Johnson, J, Kinemuchi, K, Majewski, SR, Malanushenko, E, Malanushenko, V, Nidever, DL, O'Connell, RW, Pan, K, Robin, AC, Schiavon, RP, Shetrone, M, Skrutskie, MF, Smith, VV, Stassun, K and Zasowski, G (2013) Chemodynamics of the Milky Way. I. The first year of APOGEE data

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Abstract

We investigate the chemo-kinematic properties of the Milky Way disc by exploring the first year of data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE), and compare our results to smaller optical high-resolution samples in the literature, as well as results from lower resolution surveys such as GCS, SEGUE and RAVE. We start by selecting a high-quality sample in terms of chemistry ($\sim$ 20.000 stars) and, after computing distances and orbital parameters for this sample, we employ a number of useful subsets to formulate constraints on Galactic chemical and chemodynamical evolution processes in the Solar neighbourhood and beyond (e.g., metallicity distributions -- MDFs, [$\alpha$/Fe] vs. [Fe/H] diagrams, and abundance gradients). Our red giant sample spans distances as large as 10 kpc from the Sun. We find remarkable agreement between the recently published local (d $<$ 100 pc) high-resolution high-S/N HARPS sample and our local HQ sample (d $<$ 1 kpc). The local MDF peaks slightly below solar metallicity, and exhibits an extended tail towards [Fe/H] $= -$1, whereas a sharper cut-off is seen at larger metallicities. The APOGEE data also confirm the existence of a gap in the [$\alpha$/Fe] vs. [Fe/H] abundance diagram. When expanding our sample to cover three different Galactocentric distance bins, we find the high-[$\alpha$/Fe] stars to be rare towards the outer zones, as previously suggested in the literature. For the gradients in [Fe/H] and [$\alpha$/Fe], measured over a range of 6 $ < $ R $ <$ 11 kpc in Galactocentric distance, we find a good agreement with the gradients traced by the GCS and RAVE dwarf samples. For stars with 1.5 $<$ z $<$ 3 kpc, we find a positive metallicity gradient and a negative gradient in [$\alpha$/Fe].

Item Type: Article
Authors :
NameEmailORCID
Anders, FUNSPECIFIEDUNSPECIFIED
Chiappini, CUNSPECIFIEDUNSPECIFIED
Santiago, BXUNSPECIFIEDUNSPECIFIED
Rocha-Pinto, HJUNSPECIFIEDUNSPECIFIED
Girardi, LUNSPECIFIEDUNSPECIFIED
Costa, LNDUNSPECIFIEDUNSPECIFIED
Maia, MAGUNSPECIFIEDUNSPECIFIED
Steinmetz, MUNSPECIFIEDUNSPECIFIED
Minchev, IUNSPECIFIEDUNSPECIFIED
Schultheis, MUNSPECIFIEDUNSPECIFIED
Boeche, CUNSPECIFIEDUNSPECIFIED
Miglio, AUNSPECIFIEDUNSPECIFIED
Montalbán, JUNSPECIFIEDUNSPECIFIED
Schneider, DPUNSPECIFIEDUNSPECIFIED
Beers, TCUNSPECIFIEDUNSPECIFIED
Cunha, KUNSPECIFIEDUNSPECIFIED
Prieto, CAUNSPECIFIEDUNSPECIFIED
Balbinot, Ee.balbinot@surrey.ac.ukUNSPECIFIED
Bizyaev, DUNSPECIFIEDUNSPECIFIED
Brauer, DEUNSPECIFIEDUNSPECIFIED
Brinkmann, JUNSPECIFIEDUNSPECIFIED
Frinchaboy, PMUNSPECIFIEDUNSPECIFIED
Pérez, AEGUNSPECIFIEDUNSPECIFIED
Hayden, MRUNSPECIFIEDUNSPECIFIED
Hearty, FRUNSPECIFIEDUNSPECIFIED
Holtzman, JUNSPECIFIEDUNSPECIFIED
Johnson, JUNSPECIFIEDUNSPECIFIED
Kinemuchi, KUNSPECIFIEDUNSPECIFIED
Majewski, SRUNSPECIFIEDUNSPECIFIED
Malanushenko, EUNSPECIFIEDUNSPECIFIED
Malanushenko, VUNSPECIFIEDUNSPECIFIED
Nidever, DLUNSPECIFIEDUNSPECIFIED
O'Connell, RWUNSPECIFIEDUNSPECIFIED
Pan, KUNSPECIFIEDUNSPECIFIED
Robin, ACUNSPECIFIEDUNSPECIFIED
Schiavon, RPUNSPECIFIEDUNSPECIFIED
Shetrone, MUNSPECIFIEDUNSPECIFIED
Skrutskie, MFUNSPECIFIEDUNSPECIFIED
Smith, VVUNSPECIFIEDUNSPECIFIED
Stassun, KUNSPECIFIEDUNSPECIFIED
Zasowski, GUNSPECIFIEDUNSPECIFIED
Date : 18 November 2013
Identification Number : https://doi.org/10.1051/0004-6361/201323038
Uncontrolled Keywords : astro-ph.GA, astro-ph.GA
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:22
Last Modified : 17 May 2017 15:10
URI: http://epubs.surrey.ac.uk/id/eprint/838943

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