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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 226035.0, MPI für Astronomie / Publikationen_mpia
Astrometric monitoring of the binary brown dwarf DENIS-P J1228.2-1547
Authors:Brandner, W.; Martín, E. L.; Bouy, H.; Köhler, R.; Delfosse, X.; Basri, G.; Andersen, M.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Astronomy and Astrophysics
Start Page:205
End Page:208
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present astrometric monitoring data of the
binary brown dwarf DENIS-P J1228.2-1547. The
data have been obtained with the Hubble Space
Telescope over a time span of 5.5 yr, and confirm
that DENIS-P J1228.2-1547 is indeed a common
proper motion, i.e., physical, binary. The data
cover about 1/8th of the binary orbit, indicating
an orbital period of ┖45 yr, and a semimajor
axis of ┖6.4 AU. A plausible fit of the
orbital parameters indicates that both components
of the binary are substellar, which is in good
agreement with previous mass estimates based on
the presence of lithium in the combined spectra
of both components. Since the next periastron
passage of DENIS-P J1228.2-1547 is expected for
the years 2030 to 2035, long-term astrometric
monitoring is required to derive accurate mass
estimates for the system and the individual
components. The photometry obtained with
HST/WFPC2 in the F814W band shows no indication
for photometric variability with an amplitude
larger than 0.05 mag over a time span of ┖1000
Free Keywords:astrometry; stars: binaries: visual; stars:
; low-mass; brown dwarfs; stars: fundamental
; parameters
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Königstuhl 17, 69117 Heidelberg, Germany
<EMAIL>brandner@mpia.de</EMAIL>), AB(Instituto
AstrofÞsica de Canarias, 38200 La Laguna,
Tenerife, Spain; University of Central Florida,
Dept. of Physics, PO Box 162385, Orlando, FL
32816-2385, USA <EMAIL>ege@iac.es</EMAIL>),
AC(Max-Planck-Institut fÛr Extraterrestrische
Physik, Giessenbachstr. 85748 Garching, Germany
AD(Max-Planck-Institut fÛr Astronomie,
Königstuhl 17, 69117 Heidelberg, Germany
<EMAIL>koehler@mpia.de</EMAIL>), AE(Laboratoire
d'Astrophysique de Grenoble, Université Joseph
Fourier, 38041 Grenoble Cedex 9, France
AF(Astronomy Department, University of
California, Berkeley, CA 94720, USA
AG(Max-Planck-Institut fÛr Astronomie,
Königstuhl 17, 69117 Heidelberg, Germany
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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