Volume 399, Number 1, February III 2003
|Page(s)||275 - 278|
|Section||Stellar structure and evolution|
|Published online||05 February 2003|
Infrared high angular resolution measurements of stellar sources *
European Southern Observatory, Karl-Schwarzschildstr. 2, 85748 Garching bei München, Germany
2 Osservatorio Astrofisico di Arcetri, L.go Enrico Fermi 5, 50125 Firenze, Italy
Corresponding author: A. Richichi, firstname.lastname@example.org
Accepted: 27 November 2002
We present the results of near-IR lunar occultation measurements of three well-known, large angular diameter, cool giant stars, namely X Cnc (CII), U Ori (M8III) and η Gem (M3III). Their 2.2 μm angular diameters, derived under the assumption of a uniform circular disk, are , and milliarcsec, respectively. In the case of U Ori, we find a significant deviation of the brightness profile from circular symmetry, as well as a faint signature of extended emission. The asymmetry of the brightness profile cannot be explained by scintillation effects in the lunar occultation lightcurve, and could have contributed to the important differences in previous determinations of the angular diameter of U Ori in the near-IR. Also in the case of η Gem, significant differences exist among the available angular diameter determinations.
Key words: techniques: high angular resolution / stars: fundamental parameters / stars: individual: X Cnc / stars: individual: U Ori / stars: individual: Eta Gem
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.