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Astrometric and spectroscopic confirmation of a brown dwarf companion to GSC 08047-00232. VLT/NACO deep imaging and spectroscopic observations
We report VLT/NACO imaging observations of the stars GSC 08047-00232 andHIP 6856, probable members of the large Tucana-Horologium association.During our previous ADONIS/SHARPII deep imaging survey, a substellarcandidate companion was discovered around each star. Based on VLT/NACOastrometric measurements, we find that GSC 08047-00232 and the faintcandidate companion near to it share the same proper motion with asignificance of 3.1 σ. On the contrary, the candidate companion toHIP 6856 is probably a background object with a significance of 4.3σ. We also detect a new fainter and closer candidate companion toHIP 6856, but which is likely a background object too with asignificance of 4 σ. Recent VLT/NACO spectroscopic measurements ofGSC 08047-00232 finally confirm the substellar nature of this youngbrown dwarf with a derived spectral type M 9.5±1. GSC 08047-00232B, with an estimated mass of 25±10 MJup and aneffective temperature of 2100±200 K, is presently the thirdsubstellar companion identified among young, nearby associations.Based on observations obtained at the VLT in ESO with programs 70.C-0677and 072.C-0644.
| CCD photometry and astrometry of visual double and multiple stars of the HIPPARCOS Catalogue. II. CCD photometry and differential astrometry of 288 southern ``Intermediate'' systems
We present photometric and astrometric data of about 280 visual doublestars of the ``intermediate'' class, i.e. with angular separationsmainly in the range 2arcsec < rho < 12arcsec . The observationshave been obtained in 1991-92 with a CCD camera attached to the 91 cmDutch telescope at ESO La Silla, Chile. Differential magnitudes of thedouble star components as well as magnitudes and colour indices of theindividual components have been determined in the Cousins V and Ipassbands with an internal error of about 0.005 mag and an externalaccuracy of less than 0.03 mag. In addition, angular separations havebeen secured to an internal accuracy of 0.004arcsec and position anglesto about 0.05degr. Tables 1 to 4 are only available in electronic format the CDS via ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html. Based on observationscollected at the European Southern Observatory, La Silla, Chile.
| CCD astrometry and instrumental Delta-V photometry of wide visual double stars. III - Differential measurements of often observed southern pairs
We present accurate relative positions and instrumental visual (BesselV) magnitude differences of southern wide star components. The meanaccuracy of the angular separation is 0.02 arcsecs, which corresponds to1.5 micron on the CCD chip, and of magnitude difference 0.007mag/exposure. The program pairs are targets of the HIPPARCOS mission andthey have been observed at least four times in the last 150 yrs.
| Long period double stars.
Abstract image available at:http://adsabs.harvard.edu/abs/1974A&A....33...15B
| Double stars of equal components.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972A&A....18..341S&db_key=AST
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