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85 papers · 2 filters
Luminous Red Nova AT 2019zhd, a new merger in M 31
A. Pastorello, M. Fraser, G. Valerin +20
We present the follow-up campaign of the luminous red nova (LRN) AT~2019zhd, the third event of this class observed in M 31. The object was followed by several sky surveys for abou…
Proplyds in the Flame Nebula NGC 2024
Thomas J. Haworth, Jinyoung S. Kim, Andrew J. Winter +5
A recent survey of the inner pc of the NGC 2024 star forming region revealed two distinct millimetre continuum disc populations that appear to be spatially segregat…
Investigating three Sirius-like systems with SPHERE
R. Gratton, V. D'Orazi, T. A. Pacheco +61
Sirius-like systems are wide binaries composed of a white dwarf (WD) and a companion of a spectral type earlier than M0. The WD progenitor evolves in isolation, but its wind during…
New observations of NGC 1624-2 reveal a complex magnetospheric structure and underlying surface magnetic geometry
A. David-Uraz, V. Petit, M. E. Shultz +5
NGC 1624-2 is the most strongly magnetized O-type star known. Previous spectroscopic observations of this object in the ultraviolet provided evidence that it hosts a large and dens…
The outburst of a 60 min AM CVn reveals peculiar color evolution: implications for outbursts in long period double white dwarfs
L. E. Rivera Sandoval, T. J. Maccarone, Y. Cavecchi +2
We report on multi-wavelength observations during quiescence and of the first detected outburst of the ~60 min orbital period AM CVn SDSS J113732+405458. Using X-ray and UV observa…
The Gaia spectrophotometric standard stars survey -- IV. Results of the absolute photometry campaign
G. Altavilla, S. Marinoni, E. Pancino +18
We present Johnson-Kron-Cousins BVRI photometry of 228 candidate spectrophotometric standard stars for the external (absolute) flux calibration of Gaia data. The data were gathered…