Showing papers by "Alan Fitzsimmons published in 1991"
TL;DR: Differential CCD photometry of three asteroids − 624 Hektor, 1167 Dubiago and 2060 Chiron − were carried out using the 2.5m Nordic Optical Telescope on La Palma between 1990 March 14-17 as mentioned in this paper.
Abstract: Differential CCD photometry of three asteroids − 624 Hektor, 1167 Dubiago and 2060 Chiron − were carried out using the 2.5-m Nordic Optical Telescope on La Palma between 1990 March 14-17. From the resulting light curves the rotation period of Dubiago was obtained for the first time and found to be 14 h .3 ± 0 h .1, while the previously reported rotation periods for Hektor (6 h .921) and Chiron (5 h .92) are consistent with our results. Light curve amplitudes of 0.22 ± 0.02 mag for Hektor, 0.23 ± 0.02 mag for Dubiago and 0.07 ± 0.02 mag for Chiron were derived
8 citations
TL;DR: In this paper, infrared photometry of four relatively faint (8.5 ≤ V ≤ 11.0) early-type stars at high galactic latitude has been made in the J, H, K, L' and narrow-band M wavelengths.
Abstract: Infrared photometry of four relatively faint (8.5 ≤ V ≤ 11.0) early-type stars at high galactic latitude has been made in the J, H, K, L' and narrow-band M wavelengths. This has been combined with previously published ultraviolet and visible observations to enable a comparison with LTE model atmosphere fluxes. The results imply that at least three of the stars are normal main-sequence B-star at large distances from the galactic plane.
3 citations