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J/A+A/522/A65        Lunar occultations at the ESO VLT        (Richichi+, 2010)

New high-sensitivity, milliarcsecond resolution results from routine observations of lunar occultations at the ESO VLT. Richichi A., Fors O., Chen W.-P., Mason E. <Astron. Astrophys., 522, A65-65 (2010)> =2010A&A...522A..65R
ADC_Keywords: Infrared sources ; Stars, double and multiple Keywords: techniques: high angular resolution - occultations - binaries: general - stars: fundamental parameters - circumstellar matter - infrared: stars Abstract: Lunar occultations (LO) are a very efficient and powerful technique that achieves the best combination of high angular resolution and sensitivity possible today at near-infrared wavelengths. Given that the events are fixed in time, that the sources are occulted randomly, and that the telescope use is minimal, the technique is very well suited for service mode observations. We have established a program of routine LO observations at the VLT observatory, especially designed to take advantage of short breaks available in-between other programs. We have used the ISAAC instrument in burst mode, capable of producing continuous read-outs at millisecond rates on a suitable subwindow. Given the random nature of the source selection, our aim has been primarily the investigation of a large number of stellar sources at the highest angular resolution in order to detect new binaries. Serendipitous results such as resolved sources and detection of circumstellar components were also anticipated. Description: We have recorded the signal from background stars for a few seconds, around the predicted time of occultation by the Moon's dark limb. At millisecond time resolution, a characteristic diffraction pattern can be observed. Patterns for two or more sources superimpose linearly, and this property is used for the detection of binary stars. The detailed analysis of the diffraction fringes can be used to measure specific properties such as the stellar angular size and the presence of extended light sources such as a circumstellar shell. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 85 191 List of the recorded occultation events
See also: VI/132 : Lunar Occultation Archive (Herald+ 2010) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/AJ/112/2786 : 1985-1995 lunar occultations at TIRGO (Richichi+ 1996) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2MASS 2MASS designation (HHMMSSss+DDMMSSs) 18- 27 A10 "DD/MM/YYYY" UT Date of occultation 29- 36 A8 "h:m:s" Occ.time UT time of occultation 38- 42 F5.2 mag Jmag 2MASS J magnitude 44- 48 F5.2 mag Hmag 2MASS H magnitude 50- 54 F5.2 mag Kmag 2MASS Ks magnitude 56- 63 A8 --- SpType MK spectral type 65- 85 A21 --- OName Other name of the star
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Mar-2011
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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