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J/ApJS/203/33   2MASS interferometric calibrator candidates   (Richichi+, 2012)

A catalog of near-IR sources found to be unresolved with milliarcsecond resolution. Richichi A., Fors O., Cusano F., Moerchen M. <Astrophys. J. Suppl. Ser., 203, 33 (2012)> =2012ApJS..203...33R
ADC_Keywords: Photometry, infrared ; Cross identifications ; Stars, variable ; Interferometry Keywords: binaries: general - occultations - stars: fundamental parameters - techniques: high angular resolution Abstract: We aim to provide a list of sources found to be unresolved from direct observations with high angular resolution and dynamic range, which can be used to choose interferometric calibrators. To this purpose, we have used a large number of lunar occultations recorded with the ISAAC instrument at the Very Large Telescope to select sources found to be unresolved and without close companions. An algorithm has been used to determine the limiting angular resolution achieved for each source, taking into account a noise model built from occulted and unocculted portions of the light curves. We have obtained upper limits on the angular sizes of 556 sources, with magnitudes ranging from Ks∼4 to 10, with a median of 7.2mag. The upper limits on possible undetected companions (within ∼0.5") range from Ks∼8 to 13, with a median of 11.5mag. One-third of the sources have angular sizes ≤1mas, and two-thirds have sizes ≤2mas. This list of unresolved sources matches well the capabilities of current large interferometric facilities. We also provide available cross-identifications, magnitudes, spectral types, and other auxiliary information. A fraction of the sources are found to be potentially variable. The list covers parts of the Galactic Bulge and in particular the vicinity of the Galactic Center, where extinction is very significant and traditional lists of calibrators are often insufficient. Description: The observations that form the basis of this work were obtained using the Infrared Spectrometer And Array Camera (ISAAC) instrument at the ESO VLT from 2006 March until 2012 June. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 187 556 List of sources found unresolved by the lunar occultation technique
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/142 : LUNAR OCCULTATIONS OF IRAS POINT SOURCES: 1991-2000 J/A+A/532/A101 : Lunar occultations of 184 stellar sources (Richichi+, 2011) J/A+A/522/A65 : Lunar occultations at the ESO VLT (Richichi+, 2010) J/ApJS/176/276 : PTI calibrator catalog (van Belle+, 2008) J/A+A/431/773 : CHARM2, an updated of CHARM catalog (Richichi+, 2005) J/AJ/112/2786 : 1985-1995 lunar occultations at TIRGO (Richichi+ 1996) : Lunar occultations archive access Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 17 A17 --- 2MASS 2MASS identifier (HHMMSSss+DDMMSSs; J2000) 19- 33 A15 --- OurID ESO Period number/sequential identifier (1) 34 A1 --- f_OurID [*] * = sources observed with a narrow band filter 36- 59 A24 --- Simbad Simbad identifier 61- 62 I2 h RAh Hour of Right Ascension (J2000) (2) 64- 65 I2 min RAm Minute of Right Ascension (J2000) 67- 70 F4.1 s RAs Second of Right Ascension (J2000) 72 A1 --- DE- Sign of the Declination (J2000) (2) 73- 74 I2 deg DEd Degree of Declination (J2000) (2) 76- 77 I2 arcmin DEm Arcminute of Declination (J2000) 79- 82 F4.1 arcsec DEs Arcsecond of Declination (J2000) 84- 88 F5.2 mag Bmag ? Simbad B band magnitude 90- 94 F5.2 mag Vmag ? Simbad V band magnitude 96-100 F5.2 mag Jmag ? 2MASS J band magnitude 102-106 F5.2 mag Hmag ? 2MASS H band magnitude 108-112 F5.2 mag Kmag ? 2MASS Ks band magnitude 114-122 A9 --- SpType MK spectral type 124-126 I3 --- Nref [1/106]? Number of ADS references 128-168 A41 --- OType Simbad object type(s) 170-174 F5.1 --- SNR [10/378.5] Signal-to-noise ratio 176-179 F4.1 mag Klim [8.2/12.8] K-band limiting magnitude 181-184 F4.2 mas Res [0.25/8.1] Limiting angular resolution; see Section 2 186-187 A2 --- Var [FS] Variability flag (3)
Note (1): Our own ID number, which combines the ESO Period number with the entry in our database. Note (2): Coordinates, added by CDS, for rows #190 and #268 according to 2MASS names. Note (3): Flag as follows: S = a source belonging to categories such as Miras, emission-line stars, RR Lyr or other kind of variables. F = a source for which our measured counts differed from the counts expected on the basis of the 2MASS Ks value by more than 0.6 mag (see also Fig. 8).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Dec-2012
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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