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J/A+A/493/931       MAD observations of σ Ori              (Bouy+, 2009)

A deep look into the cores of young clusters. I. σ-Orionis. Bouy H., Huelamo N., Martin E.L., Marchis F., Barrado Y Navascues D., Kolb J., Marchetti E., Petr-Gotzens M.G., Sterzik M., Ivanov V.D., Koehler R., Nuernberger D. <Astron. Astrophys., 493, 931-946 (2009)> =2009A&A...493..931B
ADC_Keywords: Associations, stellar; Stars, nearby ; Photometry, infrared Keywords: stars: formation - stars: low-mass, brown dwarfs - stars: planetary system - techniques: high angular resolution - stars: early-type Abstract: Nearby young clusters are privileged places to study the star formation history. Over the last decade, the sigma-Orionis cluster has been a prime location for the study of young very low mass stars, substellar and isolated planetary mass objects and the determination of the initial mass function. To extend previous studies of this association to its core, we searched for ultracool members and new multiple systems within the 1.5'x1.5' central region of the cluster. We obtained deep multi-conjugate adaptive optics (MCAO) images of the core of the sigma-Orionis cluster with the prototype MCAO facility MAD at the VLT using the H and Ks filters. These images allow us to detect companions fainter by DeltaH∼5mag as close as 0.2" on a typical source with H=14.5mag. These images were complemented by archival SofI Ks-band images and Spitzer IRAC and MIPS mid-infrared images. Description: MAD is a prototype instrument performing wide field-of-view, real-time correction for atmospheric turbulence. MAD was built by the European Southern Observatory (ESO) with the contribution of two external consortia to prove the feasibility of MCAO on the sky in the framework of the 2nd generation VLT instrumentation and of the European Extremely Large Telescope. During the on-sky demonstration run of MAD held in November 2007, a region of 1.5'x1.5' centered on the sigma-Orionis cluster was observed in the H and Ks filters. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 111 36 Catalog of sources detected in the MAD images table8.dat 69 398 NTT/SofI Ks-band photometry
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/A+A/478/667 : The Mayrit catalogue (Caballero, 2008) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1 A1 --- n_MAD [*+] PMO/BD object (1) 2- 12 A11 --- --- [SigOri-MAD] 13- 14 I2 --- MAD SigOri-MAD number (SigOri-MAD-NN) 16- 17 I2 h RAh Right ascension (J2000) 19- 20 I2 min RAm Right ascension (J2000) 22- 25 F4.1 s RAs Right ascension (J2000) 27 A1 --- DE- Declination sign (J2000) 28- 29 I2 deg DEd Declination (J2000) 31- 32 I2 arcmin DEm Declination (J2000) 34- 37 F4.1 arcsec DEs Declination (J2000) 39- 43 F5.2 mag Hmag ? H magnitude 45- 48 F4.2 mag e_Hmag ? rms uncertainty on Hmag (2) 50 A1 --- l_Ksmag Limit flag on Ksmag 51- 55 F5.2 mag Ksmag Ks magnitude 57- 60 F4.2 mag e_Ksmag ? rms uncertainty on Ksmag (2) 62- 88 A27 --- OName Other name 90-111 A22 --- Com Comments
Note (1): Note as follows: * = objects with H-band luminosity corresponding to a Planetary-Mass Object (PMO), defined here as M≤0.012M + = objects with H-band luminosity corresponding to a Brown Dwarf (BD), defined here as 0.012<M≤0.072M) Note (2): The errors include the zeropoint uncertainties.
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 12 A12 --- --- [SigOri-SofI] 13- 15 I3 --- SofI SigOri-SofI number (SigOri-SofI-NNN) 17- 18 I2 h RAh Right ascension (J2000) 20- 21 I2 min RAm Right ascension (J2000) 23- 26 F4.1 s RAs Right ascension (J2000) 28 A1 --- DE- Declination sign (J2000) 29- 30 I2 deg DEd Declination (J2000) 32- 33 I2 arcmin DEm Declination (J2000) 35- 38 F4.1 arcsec DEs Declination (J2000) 40- 44 F5.2 mag Ksmag Ks magnitude (1) 46- 61 A16 --- 2MASS Nearest 2MASS source name (2) 64- 69 I6 --- Mayrit ? Nearest Mayrit source name (2)
Note (1): The error on the photometry is dominated by the zeropoint uncertainty (0.19mag). Note (2): The 2MASS and Mayrit 2008, Cat. J/A+A/478/667 nearest matches within 5" are indicated. Because of the higher spatial resolution of the SofI image compared to these two catalogs, the same 2MASS or Mayrit source is sometimes associated to several SofI sources.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Mar-2009
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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