TOWARD A NETWORK of FAINT da WHITE DWARFS AS HIGH-PRECISION SPECTROPHOTOMETRIC STANDARDS

G. Narayan, T. Axelrod, J. B. Holberg, T. Matheson, A. Saha, E. Olszewski, J. Claver, C. W. Stubbs, R. C. Bohlin, S. Deustua, A. Rest

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

We present the initial results from a program aimed at establishing a network of hot DA white dwarfs to serve as spectrophotometric standards for present and future wide-field surveys. These stars span the equatorial zone and are faint enough to be conveniently observed throughout the year with large-aperture telescopes. The spectra of these white dwarfs are analyzed in order to generate a non-local-thermodynamic-equilibrium model atmosphere normalized to Hubble Space Telescope colors, including adjustments for wavelength-dependent interstellar extinction. Once established, this standard star network will serve ground-based observatories in both hemispheres as well as space-based instrumentation from the UV to the near IR. We demonstrate the effectiveness of this concept and show how two different approaches to the problem using somewhat different assumptions produce equivalent results. We discuss the lessons learned and the resulting corrective actions applied to our program.

Original languageEnglish (US)
Article number67
JournalAstrophysical Journal
Volume822
Issue number2
DOIs
StatePublished - May 10 2016

Keywords

  • cosmology: observations
  • methods: data analysis
  • surveys
  • white dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Narayan, G., Axelrod, T., Holberg, J. B., Matheson, T., Saha, A., Olszewski, E., Claver, J., Stubbs, C. W., Bohlin, R. C., Deustua, S., & Rest, A. (2016). TOWARD A NETWORK of FAINT da WHITE DWARFS AS HIGH-PRECISION SPECTROPHOTOMETRIC STANDARDS. Astrophysical Journal, 822(2), [67]. https://doi.org/10.3847/0004-637X/822/2/67