We received with great sadness the news that Paul Felenbok passed away on Tuesday 22 December 2020, at the age of 84.
Paul was born in Warsaw shortly before WWII and lived as a child in the ghetto, from which he fled through the sewers with his family in 1943, just before the tragic uprising. He was only 7 at the time, and lost both his parents during this escape.
He arrived in France in 1946, at the age of 10, and was raised in an orphanage. He obtained his baccalaureate, then a scholarship to join the Sorbonne. After a degree in physics and a certificate in fluid mechanics, he joined Paris Observatory in Meudon. He then spent a year at the University of Berkeley, after which, on his return to Meudon in 1963, he defended his thesis in theoretical and experimental molecular physics applied to astronomy. He was then appointed as an astronomer at Paris Observatory, where he remained until his retirement in 2004.
Paul Felenbok, an expert in spectroscopy, was above all a brilliant and immensely inventive instrumentalist. Among his many achievements, we owe him several major advances in spectroscopy and astronomy:
– The visionary development of vacuum UV spectroscopy in the laboratory in the 1970s, providing data that would become indispensable for future space missions.
– A new and totally innovative version of Lallemand’s electronographic camera, the so-called « valve camera », allowing the replacement of nuclear plates without breaking the vacuum in the cell compartment. This was an essential development that should have secured a long life for the electronographic camera, had it not been quickly overriden by CCD detectors.
– The introduction in France of fibre optics spectroscopy, with in particular the development in the 1980s of the prototypical mobile ISIS spectrograph, and in the 90s of the MEFOS fibre positioner and FUEGOS project at ESO.
He also largely inspired and supported the development of the MUSICOS multi-site spectroscopy network and participated in the development of the CFHT, in particular with the MOS-SIS spectrograph.
Always keen to pass on his knowledge and experience, as witnessed by the many students he has trained and for whom he has worked tirelessly, he also attached great importance to the contact with the public, as he demonstrated on many occasions, e.g. by running the public relation unit (UNICOM) of Paris Observatory at the beginning of the 2000s.
The development of astronomy in the French Alps village of St-Véran is yet another of his great achievements. In the late 1960s, he spotted the remarkable astronomical qualities of the Château-Renard site above St-Véran, considered for a time to host the planned 3.60m telescope. He managed to build there a small observatory housing a solar coronagraph, which was operated for half a dozen years. Paul then obtained that this observatory be made available to amateur astronomers who have now been using it for nearly 30 years, and then to have it completely renovated. He then developed « la Maison du Soleil (House of the Sun) », in the village of St-Véran, a public centre which houses, among other experiments, the very high-resolution spectrograph Sharmor on loan from Paris Observatory.
With Paul, the astronomical community is losing a great astronomer. He was an extraordinary man, with a sparkling intelligence, swarming with ideas. He was also a leader, a go-getter, solid, pragmatic, quick and direct. His passion and enthusiasm for astronomy and instrumentation were communicative. He was at the same time a profoundly good man, humane, generous, always ready to listen, always dedicated to others.
Paul had managed to overcome his tragic childhood, which he almost never spoke of, to build himself an extraordinarily human and endearing personality. Only a few years ago, convinced by his daughter Véronique, had he finally agreed to entrust his memories to a writer and director, David Lescot. This resulted in a deeply moving play, « Ceux qui restent (Those who remain) ».
All our saddened thoughts go out to his wife Betty and their two daughters Véronique and Isabelle and their families.