2009/01/01 by T. O. B. Schmidt, R. Neuhäuser, M. Mugrauer +3 · 1 citation
Physics and Astronomy · #Astro and Planetary Science #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.1063/1.3099250
4 pages, 2 figures, Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, St Andrews - Scotland, July 21-25 2008
openalex publication_date 2009/01/01 · arxiv created 2009/05/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
In our ongoing search for close and faint companions around T Tauri stars in the Chamaeleon star‐forming region, we recently (Schmidt et al. 2008 b) 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 σ 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 μα cos δ = −8.5±5.7 mas/yr and μδ = 12.0±5.6 mas/yr, not consistent with being a member of the Cha I star‐forming region.