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See detailPhotoelectric lightcurves and rotation period of the minor planet 201 Penelope
Surdej, Jean ULg; Louis, B.; Cramer, N. et al

in 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 ▲]

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See detailUBV photometry of the minor planets 86 Semele, 521 Brixia, 53 Kalypso and 113 Amalthea
Surdej, Jean ULg; Surdej, Anna ULg; Louis, B.

in Astronomy and Astrophysics. Supplement Series (1983), 52

The asteroids were observed photometrically during the 1980 and 1981 oppositions, respectively. The V lightcurve of 86 Semele displays two asymmetric maxima and minima with a total amplitude DeltaV = 0.18 ... [more ▼]

The asteroids were observed photometrically during the 1980 and 1981 oppositions, respectively. The V lightcurve of 86 Semele displays two asymmetric maxima and minima with a total amplitude DeltaV = 0.18 mag. Its synodic rotation period is P[SUB]s[/SUB] = 16h38m02" ± 16" and the color indices B-V = 0.690 ± 0.011 and U-B = 0.320 ± 0.015 mag. 521 Brixia is a slow rotator (P[SUB]s[/SUB] > 24h) showing light variations greater than DeltaV â 0.09 mag and with color indices B-V = 0.714 ± 0.008 and U-B = 0.337 ± 0.011 mag. 53 Kalypso rotates with a period P[SUB]s[/SUB] = 26h33m ± 4m with a total light amplitude DeltaV > 0.10 mag and color indices B-V = 0.692 ± 0.015 and U-B = 0.341 ± 0.022 mag. The lightcurve of 113 Amalthea shows large amplitude variations (DeltaV > 0.26 mag) with a broad minimum and the rotation period is greater than 12h with color indices B-V = 0.888 ± 0.012 and U-B = 0.487 ± 0.019 mag. [less ▲]

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See detailA photometric study of southern Ap stars having right ascensions on the order of 12 h
Manfroid, Jean ULg; Renson, Pierre ULg

in Astronomy and Astrophysics. Supplement Series (1983), 51

From uvby measurements periods have been deduced for the Ap stars 25 Sex, HR 4327, β Hya, HD 112381, HR 4965, HR 5158, HR 5269, and HD 125630. The star HR 4109 (Sr?) remained constant during an interval ... [more ▼]

From uvby measurements periods have been deduced for the Ap stars 25 Sex, HR 4327, β Hya, HD 112381, HR 4965, HR 5158, HR 5269, and HD 125630. The star HR 4109 (Sr?) remained constant during an interval of 23 d; the period is perhaps very long, or if HR 4109 actually does not vary, possibly it is not an Ap star. The observed variation for l Cen (Mn) was too weak to deduce a period. The variation range of HD 112381 (SiCr) is nearly as small as that of l Cen. The v and y variations for HD 125630 (SiCrSr), which are double-waved and nearly opposite to one another, have ranges among the largest known for Ap stars; the c[SUB]1[/SUB] range is also exceptionally large. For some Ap stars the variation curves show a dip of short duration in the four colours, and for a few stars a second one appears at a phase-interval of P/2. The nature of this phenomenon is discussed. [less ▲]

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See detailFurther spectroscopic observations of 25 quasi-stellar objects
Surdej, Jean ULg; Swings, Jean-Pierre ULg

in Astronomy and Astrophysics. Supplement Series (1981), 46

Spectroscopic observations are reported for 25 quasars suspected of having line profiles which are indicative of mass outflow from the central quasar. The quasars were selected on the basis of optical ... [more ▼]

Spectroscopic observations are reported for 25 quasars suspected of having line profiles which are indicative of mass outflow from the central quasar. The quasars were selected on the basis of optical variability and/or the presence of P Cygni spectral profiles, and large emission redshift, and observed on widened spectrograms obtained at the Cassegrain focus of the ESO 3.6-m telescope at La Silla during December 1977 and July 1978. Observations confirm the previously detected emission and absorption redshifts for most of the quasars, and reveal previously undetected lines and absorption redshifts in a few cases. [less ▲]

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See detailA photoelectric investigation of light variability in Ap stars
Hensberge, H.; Deridder, G.; Doom, C. et al

in Astronomy and Astrophysics. Supplement Series (1981), 46

A study of the light variability of a number of peculiar A stars, mainly in Stromgren colors u and v and in peculiarity index Delta-a, leads to the proposal of the following light variability periods: (1 ... [more ▼]

A study of the light variability of a number of peculiar A stars, mainly in Stromgren colors u and v and in peculiarity index Delta-a, leads to the proposal of the following light variability periods: (1) HD 5601, 1.11 days; (2) HD 19712, 2.19 days; (3) HD 30849, 15.86 days; (4) HD 38823, 8.64 days; (5) HD 53116, 11.98 or 18.10 days; (6) HD 56022, 0.92 days; and (7) HD 81009, 33.97 days. In addition, evidence is given for variability of HD 94660 on a time scale on the order of months or years, and it is shown that the rotation period proposed by Borra and Landstreet (1980) for HD 25267 is not supported by the light variations observed. The character of Delta-a variability is discussed. [less ▲]

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See detailPhotometric variations in Ap stars observable at La Silla in November and December
Renson, Pierre ULg; Manfroid, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1981), 44

Photometric observations of 13 Ap stars made at the European Southern Observatory at La Silla during November 1977 and December 1978 are reported. Observations were made in the uvby with the four-channel ... [more ▼]

Photometric observations of 13 Ap stars made at the European Southern Observatory at La Silla during November 1977 and December 1978 are reported. Observations were made in the uvby with the four-channel photometer at the 40-cm telescope in November, and with the one-channel photometer at the 50-cm telescope in December. Light variations with periods from 0.724 to 4.64 days are obtained for 11 of the stars, including the Hg-Mn star HR 2202, which was believed not to vary. Extremely small variations are observed in Upsilon 4 Eri, with a possible period of 0.51 days, although the two Mn components are likely to vary independently. HR 1800 was not observed to vary over two-week observation period. The stars 20 Eri, HR 1194, Alpha Dor, 11 Ori and HD 36916 are also noted to exhibit relatively large variations for Ap stars. [less ▲]

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See detailSpectroscopic and photometric observations of galaxies from the ESO/Uppsala list - Third catalogue
West, R. M.; Surdej, Jean ULg; Schuster, H.-E. et al

in Astronomy and Astrophysics. Supplement Series (1981), 46

Abstract image available at: http://esoads.eso.org/abs/1981A&AS...46...57W

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See detailUvby-Beta Photometry of Equatorial and Southern Bright Stars - Part Two
Heck, A.; Manfroid, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1980), 42

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1980A&AS...42..311H

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See detailRotation period and photoelectric lightcurves of asteroids 68 Leto and 563 Suleika
Surdej, Jean ULg; Schober, H. J.

in Astronomy and Astrophysics. Supplement Series (1980), 41

Abstract image available at: http://esoads.eso.org/abs/1980A&AS...41..335S

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See detailUBV photometry of the asteroids 9 Metis, 87 Sylvia and 247 Eukrate during their oppositions in 1978 with respect to lightcurves
Schober, H. J.; Surdej, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1979), 38

Abstract image available at: http://esoads.eso.org/abs/1979A&AS...38..269S

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See detailPhotoelectric lightcurves and rotation period of the minor planet 148 Gallia
Surdej, Anna ULg; Surdej, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1979), 37

Abstract image available at: http://esoads.eso.org/abs/1979A&AS...37..471S

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See detailPhotoelectric observations of two unusual asteroids - 1978 CA and 1978 DA
Schuster, H. E.; Surdej, Anna ULg; Surdej, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1979), 37

The two fast-moving asteroids 1978 CA and 1978 DA, discovered in February 1978 with the ESO Schmidt telescope at La Silla (Chile), were observed with a photoelectric photometer attached to the 1-m ESO ... [more ▼]

The two fast-moving asteroids 1978 CA and 1978 DA, discovered in February 1978 with the ESO Schmidt telescope at La Silla (Chile), were observed with a photoelectric photometer attached to the 1-m ESO telescope. The light curve of 1978 CA displays two fairly symmetric maxima and minima with a total amplitude of 0.8 mag in V. The synodic period of rotation found is 3 h 45 m and places 1978 CA as the third fastest rotator among all known solar objects. Concerning the minor planet 1978 DA, light variations covering one full cycle of rotation could not be monitored. Nevertheless, the rotation period exceeds 5 h, and the total amplitude is greater than 0.35 mag. [less ▲]

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See detailPeriod and Spectroscopic Orbit of TU Hor
Duerbeck, H. W.; Surdej, Anna ULg; Surdej, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1979), 36

Abstract image available at: http://esoads.eso.org/abs/1979A&AS...36..283D

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See detailPhotometric variations of southern Ap stars.
Renson, Pierre ULg; Manfroid, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1978), 34

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1978A&AS...34..445R

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See detailPhotoelectric lightcurves and rotation period of the minor planet 59 Elpis
Debehogne, H.; Surdej, Anna ULg; Surdej, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1978), 33

Abstract image available at: http://esoads.eso.org/abs/1978A&AS...33....1D

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See detailPositions of the minor planets obtained in 1976 with the great objective prism of 40 CM /f equals 4 m/ of the ESO observatory at La Silla
Debehogne, H.; Surdej, Anna ULg; Surdej, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1978), 32

The results are presented of photographic observations of asteroid positions made in August 1976 at La Silla, Chile. The quality of the sky characteristics made it possible to record objects with the ... [more ▼]

The results are presented of photographic observations of asteroid positions made in August 1976 at La Silla, Chile. The quality of the sky characteristics made it possible to record objects with the magnitude 17. Measurements of all plates were conducted with the aid of the Ascorecord measuring machine of the Royal Belgian Observatory. The reduction method employed is based on the use of five reference stars. The equatorial planet coordinates can be easily obtained from the employed parameters with the aid of the formulas considered by Smart (1944). In the evaluation procedures use was made of the SAO catalog which had been recorded on magnetic tape by the Strasbourg Observatory. Three new asteroids were discovered. The obtained data are presented in two tables. [less ▲]

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See detailPhotometric variations and period of the spectrum variable HR 3413.
Renson, Pierre ULg; Heck, A.; Manfroid, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1978), 31

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1978A&AS...31..199R

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See detailPhotoelectric lightcurves of the minor planets 29 Amphitrite, 121 Hermione and 185 Eunike
Debehogne, H.; Surdej, Anna ULg; Surdej, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1978), 32

Abstract image available at: http://esoads.eso.org/abs/1978A&AS...32..127D

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See detailSpectroscopic and photometric observations of galaxies from the ESO/Uppsala list Second catalogue
Bergwall, N. A. S.; Ekman, A. B. G.; Lauberts, A. et al

in Astronomy and Astrophysics. Supplement Series (1978), 33

Abstract image available at: http://esoads.eso.org/abs/1978A&AS...33..243B

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See detailRotation period and photoelectric lightcurves of Asteroid 471 Papagena
Surdej, Anna ULg; Surdej, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1977), 30

Asteroid 471 Papagena was observed during the 1976 opposition with a photoelectric photometer attached to the 61-cm Bochum telescope at the European Southern Observatory. The light curve shows a very ... [more ▼]

Asteroid 471 Papagena was observed during the 1976 opposition with a photoelectric photometer attached to the 61-cm Bochum telescope at the European Southern Observatory. The light curve shows a very unusual triple maximum and minimum. The synodic period found is 7 hr 9 min 23 plus or minus 19 sec and the maximum amplitude of the light curve is 0.13 magnitude. [less ▲]

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