FU orionis: A binary star?

Hongchi Wang, Daniel Apai, Thomas Henning, Ilaria Pascucci

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

By using the Adaptive Optics with a Laser for Astronomy system at the 3.6 m telescope of the Calar Alto Observatory, we detected a faint red star in the apparent vicinity of FU Ori, the prototype of the FUor outburst stars. Independent confirmation of the detection is obtained from archival Probing the Universe with Enhanced Optics/Canada-France-Hawaii Telescope images. The separation between the companion candidate and FU Ori is 0′.50, and their brightness contrast is around 4 mag. We discuss the possible nature of the newly detected star based on near-infrared photometry and its proper motion relative to FU Ori. The photometric data are consistent with a nearby late-type main-sequence star, a background giant star, and a pre-main-sequence star. On the basis of the proper motion and the stellar surface density in the direction toward FU Ori, we argue that the probabilities of the first two options are very low.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume601
Issue number1 II
StatePublished - Jan 20 2004
Externally publishedYes

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A stars
binary stars
astronomy
outburst
near infrared
observatory
laser
proper motion
stars
telescopes
giant stars
pre-main sequence stars
infrared photometry
main sequence stars
France
Canada
adaptive optics
observatories
brightness
universe

Keywords

  • Binaries: general
  • Stars: individual (FU Orionis)
  • Stars: pre-main-sequence
  • Techniques: high angular resolution

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

FU orionis : A binary star? / Wang, Hongchi; Apai, Daniel; Henning, Thomas; Pascucci, Ilaria.

In: Astrophysical Journal, Vol. 601, No. 1 II, 20.01.2004.

Research output: Contribution to journalArticle

Wang, H, Apai, D, Henning, T & Pascucci, I 2004, 'FU orionis: A binary star?', Astrophysical Journal, vol. 601, no. 1 II.
Wang, Hongchi ; Apai, Daniel ; Henning, Thomas ; Pascucci, Ilaria. / FU orionis : A binary star?. In: Astrophysical Journal. 2004 ; Vol. 601, No. 1 II.
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N2 - By using the Adaptive Optics with a Laser for Astronomy system at the 3.6 m telescope of the Calar Alto Observatory, we detected a faint red star in the apparent vicinity of FU Ori, the prototype of the FUor outburst stars. Independent confirmation of the detection is obtained from archival Probing the Universe with Enhanced Optics/Canada-France-Hawaii Telescope images. The separation between the companion candidate and FU Ori is 0′.50, and their brightness contrast is around 4 mag. We discuss the possible nature of the newly detected star based on near-infrared photometry and its proper motion relative to FU Ori. The photometric data are consistent with a nearby late-type main-sequence star, a background giant star, and a pre-main-sequence star. On the basis of the proper motion and the stellar surface density in the direction toward FU Ori, we argue that the probabilities of the first two options are very low.

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