  Photoelectric lightcurves and rotation period of the minor planet 201 PenelopeSurdej, Jean  ; ; et alin Astronomy and Astrophysics. Supplement Series (1983), 54 Results of photoelectric observations of the asteroid 201 Penelope carried out at the European Southern Observatory and Perth Observatory during the 1980 opposition of the asteroid between October 6 and ... [more ▼] Results of photoelectric observations of the asteroid 201 Penelope carried out at the European Southern Observatory and Perth Observatory during the 1980 opposition of the asteroid between October 6 and November 7 are presented. Observations were made in the standard UBV and Geneva systems at ESO, and in V-prime at Perth. Examination of composite light curves shows the presence of two distinct maxima and two distinct minima, with a total amplitude of the V light curve of 0.52 magnitudes. A mean synodic rotation period of 3 h, 44 min, 51.6 + or - 7.4 sec is derived. Using a mean phase coefficient beta[SUB]V[/SUB] = 0.037 mag/deg, a primary V (1,0) maximum of 8.51 + or - 0.01 magnitudes is obtained. Color indices are measured as B-V = 0.70 + or - 0.01 and U-B = 0.23 + or - 0.02 magnitudes, and previously reported color variations (Surdej and Cramer, 1980) are attributed to a failure in the reduction procedure. [less ▲] Detailed reference viewed: 13 (0 ULg)Spectroscopic observations of thirteen optically-selected QSOs in a large field centred around NGC 5334Surdej, Jean ; Swings, Jean-Pierre ; et alin Astronomy and Astrophysics (1982), 114 A large field (approximately 25 sq deg) around NGC 5334 was searched for QSO candidates with ultraviolet-excess, in order to investigate the space density, distribution, and luminosity of quasars near as ... [more ▼] A large field (approximately 25 sq deg) around NGC 5334 was searched for QSO candidates with ultraviolet-excess, in order to investigate the space density, distribution, and luminosity of quasars near as well as far from bright galaxies. Spectroscopic data obtained with the European Southern Observatory 3.6 m telescope are presented for 13 quasars identified within a sample of 23 observed candidates. As expected, the redshift of these optically selected quasars was found to fall in the range 0.23-2.08, with only one exception. Two, and possibly three, of the quasars of the largest redshift show absorption lines, while the remaining 10 faint blue objects display zero-redshift stellar spectra. [less ▲] Detailed reference viewed: 9 (1 ULg)Correlations between line profile and photometric variations in the B2 IV[e] star HD 45677.Swings, Jean-Pierre ; ; et alin Be Star Newsletter (1980), 1 Not Available Detailed reference viewed: 8 (1 ULg)Correlations between line-profile and photometric variations in the B 2 IV /e/ star HD 45677Swings, Jean-Pierre ; ; Surdej, Anna et alin Astronomy and Astrophysics (1980), 90 Abstract image available at: http://esoads.eso.org/abs/1980A&A....90..116S Detailed reference viewed: 10 (3 ULg)Simultaneous Photometry and Spectroscopy of the B2/E Variable Star HD45677; ; Surdej, Anna et alin IAU Colloq. 46: Changing Trends in Variable Star Research (1979) Not Available Detailed reference viewed: 15 (5 ULg) |
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