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 Citations (Scopus)

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)
JournalAstrophysical Journal
Volume447
Issue number1 PART 2
StatePublished - Jul 1 1995
Externally publishedYes

Fingerprint

stars
atmospheric modeling
pre-main sequence stars
extinction
main sequence stars
Hubble Space Telescope
spectrographs
metallicity
high resolution
synthesis
parameter
comparison
method
youth

Keywords

  • Stars: early-type
  • Stars: evolution
  • Stars: fundamental parameters
  • Stars: individual (β Pictoris)
  • Stars: pre-main-sequence

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

HST/GHRS observations of the β Pictoris system : Basic parameters and the age of the system. / Lanz, Thierry; Heap, Sara R.; Hubeny, Ivan -.

In: Astrophysical Journal, Vol. 447, No. 1 PART 2, 01.07.1995.

Research output: Contribution to journalArticle

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AU - Hubeny, Ivan -

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N2 - 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.

AB - 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.

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