/ftp/cats/aliases/K/./KTC2006



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J/A+A/459/669    JHKs photometry around alpha Cen          (Kervella+, 2006)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
	table7.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A+A/459/669
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Beginning of ReadMe : J/A+A/459/669 JHKs photometry around alpha Cen (Kervella+, 2006) ================================================================================ Deep imaging survey of the environment of alpha Centauri. I. Adaptive optics imaging of alpha Cen B with VLT-NACO. Kervella P., Thevenin F., Coude Du Foresto V., Mignard F. <Astron. Astrophys., 459, 669-678 (2006)> =2006A&A...459..669K ================================================================================ ADC_Keywords: Stars, double and multiple ; Photometry, infrared Keywords: techniques: high angular resolution - stars: individual: alpha Cen - stars: planetary systems - stars: solar neighbourhood - astronomical data bases: miscellaneous - infrared: stars Abstract: alpha Centauri is our closest stellar neighbor, at a distance of only 1.3pc, and its two main components have spectral types comparable to the Sun. This is therefore a favorable target for an imaging search for extrasolar planets. Moreover, indications exist that the gravitational mass of alpha Cen B is higher than its modeled mass, the difference being consistent with a substellar companion of a few tens of Jupiter masses. We searched for faint comoving companions to alpha Cen B. As a secondary objective, we built a catalogue of the detected background sources. We used the NACO adaptive optics system of the VLT in the J, H, and Ks bands to search for companions to alpha Cen B. This instrument allowed us to achieve a very high sensitivity to point-like sources, with a limiting magnitude of m_Ks 18 at 7" from the star. We complemented this data set with archival coronagraphic images from the HST-ACS instrument to obtain an accurate astrometric calibration. Description: We thus observed the environment of alpha Cen B using the Nasmyth Adaptive Optics System (NAOS) of the Very Large Telescope (VLT), coupled to the CONICA infrared camera. The combination of these two devices is abbreviated as NACO. The first series of observations were obtained between February 18 and April 10, 2004. We repeated the same observations one year later in order to identify the proper-motion companions, using the Ks filter only because all the sources identified in the J and H bands were also detected in Ks. One image of the southern field was obtained in July 2004, but due to operational constraints, the remaining observations were conducted in February-March 2005.