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J/A+A/459/669    JHKs photometry around α Cen          (Kervella+, 2006)

Deep imaging survey of the environment of α Centauri. I. Adaptive optics imaging of α 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table7.dat 56 252 Position and photometry of the sources detected around α Cen
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [KTC2006] Sequential number 5- 6 I2 h RAh Right ascension (ICRS, Ep=J20004.5) 8- 9 I2 min RAm Right ascension (ICRS, Ep=J2004.5) 11- 16 F6.3 s RAs Right ascension (ICRS, Ep=J2004.5) 18 A1 --- DE- Declination sign (ICRS, Ep=J2004.5) 19- 20 I2 deg DEd Declination (ICRS, Ep=J2004.5) 22- 23 I2 arcmin DEm Declination (ICRS, Ep=J2004.5) 25- 29 F5.2 arcsec DEs Declination (ICRS, Ep=J2004.5) 31- 34 F4.1 mag Jmag ? J magnitude 36- 38 F3.1 mag e_Jmag ? rms uncertainty on Jmag 40- 43 F4.1 mag Hmag ? H magnitude 45- 47 F3.1 mag e_Hmag ? rms uncertainty on Hmag 49- 52 F4.1 mag Ksmag ? Ks magnitude 54- 56 F3.1 mag e_Ksmag ? rms uncertainty on Ksmag
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 11-May-2007
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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