Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26as...44...23r&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 44, Apr. 1981, p. 23-32. In French.
Astronomy and Astrophysics
Astrophysics
24
A Stars, Stellar Spectra, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Abundance, Light (Visible Radiation), Manganese, Mercury (Metal), Stellar Radiation
Scientific paper
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.
Manfroid Jean
Renson P.
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