Photometric variations in Ap stars observable at La Silla in November and December

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 ▲]

Uvby-Beta Photometry of Equatorial and Southern Bright Stars - Part Two

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

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

UBV photometry of the asteroids 9 Metis, 87 Sylvia and 247 Eukrate during their oppositions in 1978 with respect to lightcurves

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

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

Photoelectric observations of two unusual asteroids - 1978 CA and 1978 DA

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 ▲]

Photometric variations of southern Ap stars.

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

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

Positions 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

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 ▲]

Photoelectric lightcurves of the minor planets 29 Amphitrite, 121 Hermione and 185 Eunike

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

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

Rotation period and photoelectric lightcurves of Asteroid 471 Papagena

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 ▲]

uvby photometry of some Ap stars.

in Astronomy and Astrophysics. Supplement Series (1976), 25

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1976A&AS...25..143H

ubvy photometry of some southern field stars.

in Astronomy and Astrophysics. Supplement Series (1975), 22

Abstract image available at: http://cdsads.u-strasbg.fr/abs/1975A&AS...22..323H