J/A+A/532/A101 Lunar occultations of 184 stellar sources (Richichi+, 2011)
Lunar occultations of 184 stellar sources in two crowded regions toward
the Galactic Bulge.
Richichi A., Chen W.P., Fors O., Wang P.F.
<Astron. Astrophys., 532, A101 (2011)>
=2011A&A...532A.101R 2011A&A...532A.101R
ADC_Keywords: Infrared sources ; Occultations
Keywords: techniques: high angular resolution - occultations -
binaries: general - stars: fundamental parameters - infrared: stars -
circumstellar matter
Abstract:
Lunar occultations (LO) provide a unique combination of high angular
resolution and sensitivity at near-infrared wavelengths. At the ESO
Very Large Telescope, it is possible to achieve about 1 milliarcsecond
(mas) resolution and detect sources as faint as K∼12mag.
We have taken advantage of a passage of the Moon over two crowded and
reddened regions in the direction of the inner part of the Galactic
bulge to obtain a high number of occultation light curves over two
half nights. Our goal was to detect and characterize new binary
systems, and to investigate highly extincted and relatively unknown
infrared sources in search of circumstellar shells and similar
peculiarities. Our target list included a significant number of very
late-type stars, but the majority of the sources was without spectral
classification.
Description:
Following the strategy of maximum return for minimum observing time,
we observed the passage of the Moon over two crowded regions rich in
near-infrared sources during the two first half nights of September 25
and 26, 2009. As in the previous papers we used ISAAC, this time at
the Melipal telescope (UT3).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 89 184 List of the recorded occultation events
table3.dat 92 30 Summary of results
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See also:
I/123 : Lunar Occultations of IRAS Point Sources: 1986-1990
I/142 : Lunar Occultations of IRAS Point Sources: 1991-2000
VI/132 : Lunar Occultation Archive (Herald+ 2010)
J/A+AS/80/215 : Lunar occultations of weak radio sources (Akujor+, 1989)
J/A+AS/110/107 : Lunar occultations (Meyer+ 1995)
J/AJ/112/2786 : 1985-1995 lunar occultations at TIRGO (Richichi+ 1996)
J/A+A/522/A65 : Lunar occultations at the ESO VLT (Richichi+, 2010)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs, Cat. II/246)
18- 27 A10 "DD-MM-YYYY" Obs.date Observation date
29- 36 A8 "h:m:s" Obs.time UT time of observation
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- 62 A7 --- SpType MK spectral type
64- 78 A15 --- OName Cross-Identification
80- 84 F5.1 --- SNR Signal-to-noise ratio
86- 89 F4.1 mag Klim Limiting K magnitude
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs)
18- 23 F6.4 m/ms V Fitted linear rate of the event value
25- 29 F5.1 % V/Vt-1 Deviation from the predicted rate Vt (V/Vt)-1
31- 35 F5.1 deg psi Local lunar limb slope ψ
37- 39 I3 deg PA Position angle
41- 43 I3 deg CA Contact angle
45- 49 F5.1 --- SNR Signal-to-noise ratio
51- 55 F5.1 mas Sep ?=- Projected separation for binary detections
57- 59 F3.1 mas e_Sep ?=- rms uncertainty on Sep
62- 67 F6.2 --- BR ?=- Brightness ratio
69- 73 F5.2 --- e_BR ?=- rms uncertainty on BR
75- 92 A18 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 31-Oct-2011