october 3 2012 n.
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ASPCAP Review Progress report and schedule ASPCAP status and goals

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

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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.

science requirements
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

dr10 scope
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)
  • 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)
  • 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)