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ASPCAP Review Progress report and schedule ASPCAP status and goals

October 3, 2012. ASPCAP Review Progress report and schedule ASPCAP status and goals. ASPCAP Goals.

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ASPCAP Review Progress report and schedule ASPCAP status and goals

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  1. October 3, 2012 ASPCAP ReviewProgress report and scheduleASPCAP status and goals

  2. ASPCAP Goals • Extract atmospheric parameters (Teff, logg, [M/H]) and their error covariances, and chemical abundances (C N O Na Mg Al Si S K Ca Ti Cr Mn Fe Co Ni) and their uncertainties from APOGEE spectra • Other • Coarse characterization • Identify double-lined spectroscopic binaries • Provide optimal templates for RV measurement • Provide hot-star templates for telluric-line removal Breaking new ground. Never done before automatically.

  3. Science requirements • Must-have (top-priority) elements: C N O Mg Al Si Ca Fe Ni • Important-to-have (medium-priority) elements: Na S Ti Mn K • If-at-all-possible elements: V Cr Co • 0.1 dex internal precision; 0.2 dex external accuracy • Top priority elements to be measured for >80% of the stars with 2 or more lines • Medium priority elements to be measured for >50% of the stars For cool/metal-rich stars requires use of blended/overlapping features

  4. DR10 Scope • Stellar parameters: Teff, log g, [M/H], for apStar • Open issues: • Abundances: [α/Fe], [C/Fe], and [N/Fe] • Parameters for apVisit? • S/N limit • Uncertainties • Zero point errors (e.g., log g) • Repeatability • Noding • Systematic effects (e.g., [M/H] vs Teff correlations)

  5. Personnel • Carlos Allende Prieto: team leader, software development and testing, ASPCAP runner • Szabolcs Meszaros (IAC): PD, model atmospheres, ASPCAP runner, testing using cluster and Kepler stars • Ana Elia Garcia-Perez (UVa): PD, ASPCAP runner, software development and testing • Jon Holtzman (NMSU): software development and testing, ASPCAP runner, testing using Kepler stars • Matthew Shetrone (HET): Line lists, “manual” abundance analysis of cluster stars • Lars Kosterke: software development • Verne Smith (NOAO/ON): Abundance analysis of FTS stars • Katia Cunha (NOAO/ON): “Manual” abundances of field stars • New additions: Maria Bergemann (postdoc, MPIA), Nick Trout (graduate student, UVa)

  6. Priorities • Select “official” version of ASPCAP and tag it • Establish content of DR10 • Uncertainties • Repeatability • Verify reality of [α/Fe], [C/Fe], [N/Fe], using cluster, FTS stars • Systematics: log g mismatch, Teff-[M/H] correlation – Kepler stars • Noding • Define test/verification sample • Combination of Kepler, cluster, standard stars • Representative sample, covering full range of parameter space • Define next batch of elemental abundances for DR11 • Balance scientific interest with easiness • Define spectral regions for elemental abundances • Plan incorporation of additional effort (Bergemann, Trout)

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