ASPCAP Review Progress report and schedule ASPCAP status and goals - PowerPoint PPT Presentation

October 3 2012
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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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October 3 2012

October 3, 2012

ASPCAP ReviewProgress report and scheduleASPCAP status and goals


Aspcap goals

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)


Personnel

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)


Priorities

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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