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J/AJ/117/1375       Orion Trapezium cluster                  (Simon+, 1999)

Adaptive optics imaging of the Orion Trapezium cluster. Simon M., Close L.M., Beck T.L. <Astron. J. 117, 1375 (1999)> =1999AJ....117.1375S
ADC_Keywords: Clusters, open ; Stars, double and multiple ; Photometry Keywords: binaries: visual - stars: pre-main-sequence - techniques: image processing Abstract: We have imaged an area ∼5arcmin2 at the center of the Trapezium cluster in Orion in the K band using the University of Hawaii (UH) adaptive optics system at the UH 2.2 m telescope. Our survey detects 292 stars brighter than K=18.2mag and resolves pairs to the 0.23" diffraction limit of the telescope. The binary fraction in the angular separation range 0.3"-0.6", corresponding to 132-264AU at 440pc, is indistinguishable from that of the solar-like stars in the solar neighborhood. Proplyds are associated with both single stars and visual binaries. About half the stars in our sample have also been measured at V and I by Prosser et al. (1994ApJ...421..517P); most of these seem to be about 106yr old, observed through moderate extinction, and having some excess emission at K. The luminosity function turns over before the stellar limit of ∼13.5mag, indicating that the cluster does not contain a large population of massive brown dwarfs. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 78 292 Detected stars in the Trapezium cluster
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [SCB99] Sequential number 5- 8 I4 pix xpos x position 10- 13 I4 pix ypos y position 15- 16 I2 h RAh Right ascension (J2000.0) 18- 19 I2 min RAm Right ascension (J2000.0) 21- 26 F6.3 s RAs Right ascension (J2000.0) 28 A1 --- DE- Declination sign (J2000.0) 29- 30 I2 deg DEd Declination (J2000.0) 32- 33 I2 arcmin DEm Declination (J2000.0) 35- 39 F5.2 arcsec DEs Declination (J2000.0) 41- 45 F5.2 mag Kmag ?=0 K magnitude 47- 51 F5.2 mag Vmag ?=0 V magnitude 53- 57 F5.2 mag Imag ?=0 I magnitude 59- 61 I3 --- PSH Prosser et al. (1994ApJ...421..517P) identification number 63- 65 I3 --- TCC McCaughrean et al. (1994AJ....108.1382M) identification number 67- 78 A12 --- Name Other name
History: From AJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 27-May-1999
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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