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A new value of the period of the classical Cepheid RT Aur on the basis of 456 times of maximum, 1897-2023
Guy Boistel
The present study collects 456 new times of maximum light of the classical Cepheid RT Aur, covering the period from 1897 to 2022. The O-C diagram resulting from these observations…
Period variation of the classical Cepheid SV Vulpeculae over a century (1913-2022)
Guy Boistel
This study analyzes 338 new times of visual, CCD, photoelectric and photographic maxima of the classical Cepheid SV Vul. The corresponding observations were made between 1913 and 2…
Photometric survey of the red giant V449 Cygni over half a century (1974 to 2022). A semi-regular variable star with a period of ~54 days
Guy Boistel
This study sums up a major part of the red giant V449 Cygni measurements for the years 1974 through 2022, obtained by visual and CCD GEOS observers, the Unione Astrofili Italiani,…
From Lacaille to Lalande. French works on lunar distances, nautical ephemerides and lunar tables, 1742-1785
Guy Boistel
The papers studies the highly misknown works of french astronomers on ephemerides and lunar distances on the period 1742-1785. These works will have a strong influence on the devel…
AY Peg, a large amplitude Algol-type star
Guy Boistel, Stephane Ferrand
The present paper gives new elements for the light variations of the EA variable star AY Peg, on the basis of new times of minimum performed visually and with ccd by members of GEO…