New astrometry and photometry for the companion candidates of CT Cha

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dc.creatorSchmidt, T. O. B.
dc.creatorNeuhäuser, R.
dc.creatorMugrauer, M.
dc.creatorBedalov, A.
dc.creatorVogt, N.
dc.date2009-05-12
dc.date.accessioned2026-07-07T13:14:09Z
dc.date.available2026-07-07T13:14:09Z
dc.descriptionIn our ongoing search for close and faint companions around T Tauri stars in the Chamaeleon star-forming region, we recently (Schmidt et al 2008b) presented direct observations and integral field spectroscopy of a new common proper motion companion to the young T-Tauri star and Chamaeleon member CT Cha and discussed its properties in comparison to other young, low-mass objects and to synthetic model spectra from different origins. We now obtained for the first time direct H-Band observations of the companion CT Cha b and of another faint companion candidate (cc2) approximately 1.9 arcsec northeast of CT Cha using the Adaptive Optics (AO) instrument Naos-Conica (NACO) at the Very Large Telescope (VLT) of the European Southern Observatory (ESO) in February 2008. From these data we can now exclude by 4.4 & 4.8 sigma that CT Cha b is a non-moving background object and find cc2 to be most likely a background star of spectral type <= K4 with a proper motion of mu{alpha} cos{delta} = -8.5 +/- 5.7 mas/yr and mu{delta} = 12.0 +/- 5.6 mas/yr, not consistent with being a member of the Cha I star-forming region.
dc.description4 pages, 2 figures, Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, St Andrews - Scotland, July 21-25 2008
dc.identifierhttps://arxiv.org/abs/0905.1936
dc.identifierhttp://arxiv.org/abs/0905.1936
dc.identifierdoi:10.1063/1.3099250
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230123
dc.subjectEarth and Planetary Astrophysics
dc.subjectSolar and Stellar Astrophysics
dc.titleNew astrometry and photometry for the companion candidates of CT Cha
dc.typetext

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