Affiliation: | (1) GRAAL, Université Montpellier II/ CNRS, F-34905 Montpellier Cedex 05, France;(2) Racah Institute, Hebrew University of Jerusalem, Israel;(3) GRAAL, Université Montpellier II/ CNRS, F-34905 Montpellier Cedex 05, France;(4) AAVSO, 25 Birch street, 02138-1205 Cambridge, MA, USA |