TY - JOUR
T1 - The Calar Alto lunar occultation program: Update and new results
AU - Richichi, A.
AU - Fors, O.
AU - Merino, M.
AU - Otazu, X.
AU - Núñez, J.
AU - Prades, A.
AU - Thiele, U.
AU - Pérez-Ramírez, D.
AU - Montojo, F. J.
PY - 2006/1/1
Y1 - 2006/1/1
N2 - We present an update of the lunar occultation program which is routinely carried out in the near-IR at the Calar Alto Observatory. A total of 350 events were recorded since our last report (Fors et al. 2004, A&A, 419, 285). In the course of eight runs we have observed, among others, late-type giants, T-Tauri stars, and infrared sources. Noteworthy was a passage of the Moon close to the galactic center, which produced a large number of events during just a few hours in July 2004. Results include the determinations of the angular diameter of RZ Ari, and the projected separations and brightness ratios for one triple and 13 binary stars, almost all of which representing first time detections. Projected separations range from 0″.09 to 0″.007. We provide a quantitative analysis of the performance achieved in our observations in terms of angular resolution and sensitivity, which reach about 0″.003 and K ≈ 8.5 mag, respectively. We also present a statistical discussion of our sample, and in particular of the frequency of detection of binaries among field stars. © ESO 2006.
AB - We present an update of the lunar occultation program which is routinely carried out in the near-IR at the Calar Alto Observatory. A total of 350 events were recorded since our last report (Fors et al. 2004, A&A, 419, 285). In the course of eight runs we have observed, among others, late-type giants, T-Tauri stars, and infrared sources. Noteworthy was a passage of the Moon close to the galactic center, which produced a large number of events during just a few hours in July 2004. Results include the determinations of the angular diameter of RZ Ari, and the projected separations and brightness ratios for one triple and 13 binary stars, almost all of which representing first time detections. Projected separations range from 0″.09 to 0″.007. We provide a quantitative analysis of the performance achieved in our observations in terms of angular resolution and sensitivity, which reach about 0″.003 and K ≈ 8.5 mag, respectively. We also present a statistical discussion of our sample, and in particular of the frequency of detection of binaries among field stars. © ESO 2006.
KW - Astrometry
KW - Binaries: close
KW - Binaries: visual
KW - Occultations
U2 - https://doi.org/10.1051/0004-6361:20053901
DO - https://doi.org/10.1051/0004-6361:20053901
M3 - Article
VL - 445
SP - 1081
EP - 1088
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
SN - 0004-6361
ER -