Variable Stars – Veränderliche Sterne

Fraom article Sturm/Schwab SuW 1982

Nava Aquilae 1982 lightcurve. From article Sturm/Schwab, SuW 1982

In the 1980th I observed my first variable stars at the Starkenburg Observatory Heppenheim, see articles of Nova Aquilae from german magazine Sterne und Weltraum (1982) and the german newspaper (1985).

Almost four decades later, on 2019-07-26, I discovered a variable star with the Calar Alto Schmidt Telescope (funded by ESA). After further investigations it turned out, that V6609 Sgr alias J1832.4-1627 is the first known eclipsing stream-fed intermediate polar, a long sought star system. In 2025 I discovered my second variable star, an RV Tauri star, cataloged as USNO-B1.0 0735-0602274.

Since 2020 I am registered observer of the American Association of Variable Star Observers AAVSO (individual code EERA) and since 2025 of the Bundesdeutsche Arbeitsgemeinschaft Veränderliche Sterne BAV (code SWA).  The following lightcurves I have submitted to the database of the AAVSO:
-> V6609 Sgr on 2020-05-25  eclipsing stream-fed intermediate polar, dwarf star rotation recorded
-> EP Dra       on 2020-05-30  cataclysmic AM Herculis type, eclipsing recorded