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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 225843.0, MPI für Astronomie / Publikationen_mpia
FU Orionis: A binary star?
Authors:Wang, Hongchi; Apai, Daniel; Henning, Thomas; Pascucci, Ilaria
Date of Publication (YYYY-MM-DD):2004
Title of Journal:The Astrophysical Journal
Volume:601
Start Page:L83
End Page:L86
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
Free Keywords:Stars: Binaries: General; Stars: Individual:
; Constellation Name: FU Orionis; Stars:
; Pre-Main-Sequence; Techniques: High Anular
; Resolution
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:K‚‚ouml;nigstuhl 17, D-69117 Heidelberg, Germany;
<EMAIL>wang@mpia-hd.mpg.de</EMAIL>.; Purple
Mountain Observatory, Academia Sinica, 2 Beijing
Xi Lu, Nanjing, Jiangsu 210008, People's Republic
of China.), AB(Max-Planck-Institut f‚‚uuml;r
Astronomie, K‚‚ouml;nigstuhl 17, D-69117
Heidelberg, Germany;
<EMAIL>wang@mpia-hd.mpg.de</EMAIL>.),
AC(Max-Planck-Institut f‚‚uuml;r Astronomie,
K‚‚ouml;nigstuhl 17, D-69117 Heidelberg, Germany;
<EMAIL>wang@mpia-hd.mpg.de</EMAIL>.),
AD(Max-Planck-Institut f‚‚uuml;r Astronomie,
K‚‚ouml;nigstuhl 17, D-69117 Heidelberg, Germany;
<EMAIL>wang@mpia-hd.mpg.de</EMAIL>.)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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