J/A+A/464/373 VRIZJHK photometry around Alpha Cen (Kervella+, 2007)
Deep imaging survey of the environment of Alpha Centauri
II. CCD imaging with the NTT-SUSI2 camera.
Kervella P., Thevenin F.
<Astron. Astrophys. 464, 373 (2007)>
=2007A&A...464..373K 2007A&A...464..373K
ADC_Keywords: Stars, double and multiple ; Photometry, CCD ;
Photometry, infrared
Keywords: stars: individual: Alpha Cen - planetary systems - stars: imaging -
solar neighbourhood - astronomical data bases: miscellaneous
Abstract:
Thanks to its proximity, alpha Centauri is an outstanding target for
an imaging search for extrasolar planets.
We searched for faint comoving companions to alpha Cen located at
angular distances of a few tens of arcseconds, up to 2-3 arcmin.
We obtained CCD images from the NTT-SUSI2 instrument in the Bessel V,
R, I, and Z bands, and archive data from 2MASS.
Description:
table1.dat lists the background sources identified on deep CCD images
of the close environment of Alpha Centauri (up to approximately 2.5').
Our VRIZ photometry has been complemented by JHK photometry extracted
from the corresponding 2MASS images (Skrutskie et al.,
2006AJ....131.1163S 2006AJ....131.1163S). This catalogue is particularly intended to
provide a reference for future searches for faint companions of Alpha
Centauri. Unavailable values are replaced by 99.00 in the table.
We have revised the coordinates of the catalogue published in 2007.
They are now much more consistent with reference astrometric catalogues
such as 2MASS (Cat. II/246). There was a shift of typically 2
arcseconds between the 2MASS and SUSI2 coordinates, and now this is
reduced to less than 0.5 arcsecond.
We have also recomputed the photometric magnitudes using more accurate
aperture corrections and instrument zero points
The new version of the table is available on 13-Jun-2016, in place
of the old one, in Vizier.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 114 4313 *Catalogue of background sources near Alpha Cen
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Note on table1.dat: Coordinates and magnitudes revisited, on 13-Jun-2016,
from author.
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Catalogue number
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 17 F6.3 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 30 F5.2 arcsec DEs Declination (J2000)
32- 36 F5.2 mag Vmag ?=99.00 Bessel V band magnitude
38- 42 F5.2 mag e_Vmag ?=99.00 Uncertainty on V magnitude (1)
44- 48 F5.2 mag Rmag ?=99.00 Bessel R band magnitude
50- 54 F5.2 mag e_Rmag ?=99.00 Uncertainty on R magnitude (1)
56- 60 F5.2 mag Imag ?=99.00 Bessel I band magnitude
62- 66 F5.2 mag e_Imag ?=99.00 Uncertainty on I magnitude (1)
68- 72 F5.2 mag Zmag ?=99.00 Bessel Z band magnitude
74- 78 F5.2 mag e_Zmag ?=99.00 Uncertainty on Z magnitude (1)
80- 84 F5.2 mag Jmag ?=99.00 2MASS J band magnitude
86- 90 F5.2 mag e_Jmag ?=99.00 Uncertainty on J magnitude
92- 96 F5.2 mag Hmag ?=99.00 2MASS H band magnitude
98-102 F5.2 mag e_Hmag ?=99.00 Uncertainty on H magnitude
104-108 F5.2 mag Kmag ?=99.00 2MASS K band magnitude
110-114 F5.2 mag e_Kmag ?=99.00 Uncertainty on K magnitude
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Note (1): A systematic error of 0.2mag is applied to all magnitudes.
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Acknowledgements:
Pierre Kervella, pierre.kervella(at)obspm(fr)
References:
Kervella et al., Paper I 2006A&A...459..669K 2006A&A...459..669K
History:
* 22-Feb-2007: First on-line version
* 13-Jun-2016: Corrected version, from author
(End) P. Kervella [Observatoire de Paris], Patricia Vannier [CDS] 13-Jun-2016