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- Center for Astrophysics Harvard & SmithsonianUS68 papers
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5 papers · 2 filters
Pulsations, eruptions, and evolution of four yellow hypergiants
A. M. van Genderen, A. Lobel, H. Nieuwenhuijzen +5
We aim to explore the variable photometric and stellar properties of four yellow hypergiants (YHGs), HR8752, HR 5171A, Cas, and HD 179821, and their pulsations of hundreds of d…
The detection and characterisation of 54 massive companions with the SOPHIE spectrograph -- 7 new brown dwarfs and constraints on the BD desert
F. Kiefer, G. Hébrard, J. Sahlmann +35
Brown-dwarfs are substellar objects with masses intermediate between planets and stars within about 13-80Mjup. While isolated BDs are most likely produced by gravitational collapse…
Topological changes in the magnetic field of LQ Hya during an activity minimum
Jyri J. Lehtinen, Maarit J. Käpylä, Thomas Hackman +6
Previous studies have related surface temperature maps, obtained with the Doppler imaging (DI) technique, of LQ Hya with long-term photometry. We compare surface magnetic field map…
Absolute dimensions of the early F-type eclipsing binary V506 Ophiuchi
Guillermo Torres, Claud H. Sandberg Lacy, Francis C. Fekel +1
We report extensive differential V-band photometry and high-resolution spectroscopic observations of the early F-type, 1.06-day detached eclipsing binary V506 Oph. The observations…
HST/STIS analysis of the first main sequence pulsar CU Vir
J. Krticka, Z. Mikulasek, G. W. Henry +9
CU Vir has been the first main sequence star that showed regular radio pulses that persist for decades, resembling the radio lighthouse of pulsars and interpreted as auroral radio…