HST/GHRS observations of the β pictoris system: Basic parameters and the age of the system

Thierry Lanz, Sara R. Heap, Ivan Hubeny

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

We have reevaluated the basic parameters and age of the A5 IV-V star, β Pictoris, making use of new observations obtained by the Goddard High-Resolution Spectrograph aboard the Hubble Space Telescope and using modern methods of atmospheric modeling and spectral synthesis. We derive stellar parameters appropriate to its spectral type (Teff = 8200 ± 150 K, log g = 4.25 ± 0.1) including a normal (solar) metallicity. When dated by comparison with current evolutionary tracks, we find that (1) the star is apparently “underluminous”—a situation we attribute to (gray) extinction by the disk—and (2) the star is either a pre-main-sequence (PMS) star nearing the zero-age main sequence (ZAMS), or it is a main-sequence star older than 0.3 Gyr. Given the apparent youth of the disk as inferred from its high density, we judge the PMS interpretation as most likely.

Original languageEnglish (US)
Pages (from-to)L41-L44
JournalAstrophysical Journal
Volume447
Issue number1
DOIs
StatePublished - Jul 1 1995

Keywords

  • Stars: Early-type
  • Stars: Evolution
  • Stars: Fundamental parameters
  • Stars: Individual (β Pictoris)
  • Stars: Pre-main-sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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