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SEGUE Activity at the IAC. C. Allende Prieto. Summary. Software developments: new template libraries and software for the reduction pipeline. NOT (yet) for the SSPP. Research on deriving abundances of Ca, Mg, C and Si (Emma Fernández Alvar - PhD student)

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segue activity at the iac

SEGUE Activity at the IAC

C. Allende Prieto

summary
Summary
  • Software developments: new template libraries and software for the reduction pipeline. NOT (yet) for the SSPP.
  • Research on deriving abundances of Ca, Mg, C and Si (Emma Fernández Alvar - PhD student)
  • Building a library of stellar spectra from SDSS (pre-BOSS) stellar spectra (Victor de la Reina - summer student)
new libraries
New libraries
  • M-K type 3500-5000 K (Kurucz)
  • G-F type 4750-6500 K (Kurucz)
  • F-A-type 6250-8750 K (Kurucz)
  • A-type 8500-11500 K (Kurucz)
  • B-type 12000-26000 K (Kurucz)
  • O-type 27000-39000 K (Kurucz)
  • Hot DA white dwarfs (I. Hubeny)
  • Cool DA white dwarfs (D. Koester)
  • NLTE B-type and O-type (Tlusty)
  • M-L type 2000-3500 K (MARCS)
  • L-T type 800-2500 K (Sudarsky et al.)
new libraries1
New libraries
  • M-K type 3500-5000 K (Kurucz)
  • G-F type 4750-6500 K (Kurucz)
  • F-A-type 6250-8750 K (Kurucz)
  • A-type 8500-11500 K (Kurucz)
  • B-type 12000-26000 K (Kurucz)
  • O-type 27000-39000 K (Kurucz)
  • Hot DA white dwarfs (I. Hubeny)
  • Cool DA white dwarfs (D. Koester)
  • NLTE B-type and O-type (Tlusty)
  • M-L type 2000-3500 K (MARCS)
  • L-T type 800-2500 K (Sudarsky et al.)

READY!

new libraries2
New libraries
  • M-K type 3500-5000 K (Kurucz)
  • G-F type 4750-6500 K (Kurucz)
  • F-A-type 6250-8750 K (Kurucz)
  • A-type 8500-11500 K (Kurucz)
  • B-type 12000-26000 K (Kurucz)
  • O-type 27000-39000 K (Kurucz)
  • Hot DA white dwarfs (I. Hubeny)
  • Cool DA white dwarfs (D. Koester)
  • NLTE B-type and O-type (Tlusty)
  • M-L type 2000-3500 K (MARCS)
  • L-T type 800-2500 K (Sudarsky et al.)

Including [/Fe]

software
Software
  • Gaussian LSF (fiber, )
  • Quadratic interpolation of fluxes
  • Normalization by blocks
  • Full covariance matrix
  • Successful tests performed on MILES library
software1
Software
  • Gaussian LSF (fiber, )
  • Quadratic interpolation of fluxes
  • Normalization by blocks
  • Successful tests performed on MILES library
continuum on
Continuum on

This

Work

MILES parameters (Cenarro et al. 2009)

[Fe/H] Teff logg

Distributions of residuals

continuum off
Continuum off

This

Work

MILES parameters (Cenarro et al. 2009)

[Fe/H] Teff logg

Distributions of residuals

actual sdss segue data
Actual SDSS/SEGUE data
  • NGC 2420: plate 2078 mjd 53378
  • Reddening ignored!
  • No continuum flattening
  • <Fe/H> = -0.8 +/- 0.2 dex for G- and F-type stars in plate
ngc 2420
NGC 2420
  • The [Fe/H] offset disappears when we flatten the continuum
  • The metallicities for the cluster stars show less scatter, comparable with k24 and ngs
abundances of ca mg c si
Abundances of Ca, Mg, C, Si
  • PhD student Emma Fernández Alvar
  • Derived sensitivity of spectrum to changes in the abundances of some 20 elements as function of Teff,logg,[Fe/H]
  • Currently performing simulations with Gaussian noise to quantify better previous results. Next: to incorportate Connie Rockosi’s noise model
an empirical spectral library
An empirical spectral library
  • Summer student Víctor de la Reina
  • Based on SSPP ‘adop’ parameters
  • Product is not a data base, but software
  • Now 3 parameters, later maybe 4
  • Problem split into two: 1) choosing boxes, 2) averaging spectra
  • Filtering by spectra and at pixel level
  • 0.03 dex in logTeff, 0.5 dex in logg, 0.5 dex in [Fe/H] gives ~ 800 classes (median population ~ 100 stars/box) for 300,000+ spectra in survey=segue1-2
summary1
Summary
  • Software developments: new template libraries and software for the reduction pipeline. NOT (yet) for the SSPP.
  • Research on deriving abundances of Ca, Mg, C and Si (Emma Fernández Alvar - PhD thesis)
  • Building a library of stellar spectra from SDSS (pre-BOSS) stellar spectra (Victor de la Reina - summer student)