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Pierre Kervella
Professional astronomer at Paris Observatory (France), head of the education department. I am working on Alpha Centauri, Cepheids and other types of stars.
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Pierre Kervella proslijedio/la je tweet
Observatoire de Paris | PSL 4. velj
Fabienne Casoli élue Présidente de l’Observatoire de Paris - PSL
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Pierre Kervella 2. velj
Odgovor korisniku/ci @PlanetariumBO @AAVSO
Unfortunately this is not possible to observe a full SED of Betelgeuse in "one shot" as the instruments (telescopes, detectors) are different depending on the wavelength domains.
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Pierre Kervella 2. velj
Odgovor korisniku/ci @PlanetaryGao
Molecules and dust are certainly suspects, but this is a bit too early to be sure. The fainting of Betelgeuse is a very interesting puzzle, but not so easy to solve. We are collecting various data sets at the moment.
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Astronomy Magazine 31. sij
Henrietta Swan Leavitt, one of many women "computers" at Harvard University a century ago, unlocked the key to our three-dimensional universe using Cepheid variable stars.
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Pierre Kervella 30. sij
Odgovor korisniku/ci @FringeDoctor
Yes we try! A few AAVSO observers do J and H, and we attempt in Meudon. But this is hard, as it is so enormously bright in the . The brightness of is stable is JHK, which points as an obscuration by circumstellar dust.
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Pierre Kervella 29. sij
Thank you and for this nice summary of a very interesting paper on the Hubble constant controversy
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Dr. Stella Kafka 26. sij
ok fine, the mean values are even lower, it dimmed a little more...
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Ethan Siegel 23. sij
This Is What We'll See When Betelgeuse Really Does Go Supernova There are a lot of visual signals that will arrive, but the neutrinos come first, then there's a brilliant but brief spike in brightness, then a slow rise to maximum, a fall-off, and more.
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Didier Queloz 21. sij
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Brunier Serge 23. sij
Orion et la Licorne, mosaïque de deux séries de poses de 5 minutes, Nikon D810 A, filtre STC et 50 mm à 5.6. Montage vite fait, mais ça donne envie de la refaire sérieusement...
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Didier Queloz 20. sij
Elon Musk, SpaceX Unveil Latest Starlink Plans, Creating An Astronomical Emergency by in
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Brunier Serge 19. sij
Bételgeuse hier soir, dans le ciel brumeux de la banlieue parisienne… Jusqu'ici tout va bien : elle est toujours là. Elle est même sacrément impressionnante, malgré sa chute de luminosité, les gens qui habitent dans les parages doivent pas faire les malins, en ce moment… 😬😉🤓
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ASAS-SN 16. sij
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Didier Queloz 16. sij
Open call to American lawyers stargazers to look at the possible breach of law. Please spread the words. Let’s save our sky!
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Pierre Kervella 17. sij
Odgovor korisniku/ci @ESO @AandA_journal
The core of the star (in red) rotates 50% faster than the envelope (in green). The rotation period of is less than 8 hours, compared to one month for the Sun! This explains its extreme flattening. The paper is freely available here:
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Pierre Kervella 17. sij
A new work led by Kevin Bouchaud presents a realistic model of the internal rotation of the star ! It relies on interferometric data and is just published in . Image: Altair compared to the Sun (PR in French)
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Dr. Gerard van Belle 15. sij
And here comes version 2.0 - higher orbits, so visible all night long. Sky pollution isn't just for dawn and dusk anymore!
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Pierre Kervella 14. sij
Odgovor korisniku/ci @Astro_MiguelM @franceinter @kepler75
J'ai aussi eu le plaisir de parler de avec Sophie Bécherel donc peut-être serons nous tous les deux diffusés dans ? 🙂
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Pierre Kervella 13. sij
Odgovor korisniku/ci @LeoBurtscher @ESO
Hi Leonard, yes with several colleagues we are monitoring our old friend using a variety of facilities. I could certainly make a short overview of what we know from IR observations at the workshop, but I am not sure that we will have already analyzed the new data
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Nature Astronomy 13. sij
Joint spectroastrometry and reverberation mapping provide a novel measurement of the distance to the active galaxy nucleus 3C273 and hence the Hubble Constant. Wang et al.:
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