2000A&A...353..147V

We present and discuss new photometric data obtained with an IR camera in the J and K pass-bands for the intermediate age open clusters IC 166 (936 stars in total) and NGC 7789 (1030 stars in total). IC 166 is a poorly studied open cluster for which no IR data was available previously, while NGC 7789 is a well studied open cluster. We show that IC 166 is of intermediate age (about 1.0Gyr), with a reddening E(V-K)≃1.3 (corresponding to E(B-V)=0.50) and a true distance modulus (m-M)₀=13.25. These values are significantly different from previous determinations. NGC 7789 is found to be a 1.4Gyr open cluster. The metallicity derived with the method developed by Tiede et al (1997AJ....114..694T) is found to be closer to the spectroscopic estimate than previous photometric studies.