Open AccessNear‐infrared time‐series photometry of six fields in the young open cluster IC 2391
Author(s) -
Koen Chris,
Ishihara Akika
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10340.x
Subject(s) - physics , photometry (optics) , open cluster , astrophysics , stars , stellar classification , astronomy , variable star
Fields containing targets of spectral types later than M5 were monitored in JHK s for about 7 h each. None of the targets showed variability at levels exceeding 0.02 (or smaller, in some cases). Seven new variable stars were discovered serendipitously. The large number of measurements (more than 50) of each field allows the construction of accurate colour–magnitude and colour–colour diagrams. These could be used to identify a small number of candidate very cool objects.