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22 papers · 1 filter
The Central Star Candidate of the Planetary Nebula Sh2-71: Photometric and Spectroscopic Variability
Teo Močnik, Myfanwy Lloyd, Don Pollacco +1
We present the analysis of several newly obtained and archived photometric and spectroscopic datasets of the intriguing and yet poorly understood 13.5-mag central star candidate of…
Likely detection of water-rich asteroid debris in a metal-polluted white dwarf
R. Raddi, B. T. Gaensicke, D. Koester +5
The cool white dwarf SDSS J124231.07+522626.6 exhibits photospheric absorption lines of 8 distinct heavy elements in medium resolution optical spectra, notably including oxygen. Th…
Candidate hypervelocity stars of spectral type G and K revisited
E. Ziegerer, M. Volkert, U. Heber +3
Hypervelocity stars (HVS) move so fast that they are unbound to the Galaxy. When they were first discovered in 2005, dynamical ejection from the supermassive black hole (SMBH) in t…
Hot subdwarf binaries from the MUCHFUSS project - Analysis of 12 new systems and a study of the short-period binary population
T. Kupfer, S. Geier, U. Heber +6
The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions like massive white dw…
Subaru and Swift observations of V652 Herculis: resolving the photospheric pulsation
C. S. Jeffery, D. Kurtz, H. Shibahashi +4
High resolution spectroscopy with the Subaru High Dispersion Spectrograph, and Swift ultraviolet photometry are presented for the pulsating extreme helium star V652\,Her. Swift pro…
Wave dynamics in a sunspot umbra
R. Sych, V. M. Nakariakov
The high spatial and time resolution data obtained with SDO/AIA for the sunspot in active region NOAA 11131 on 08 December 2010 were analysed with the time-distance plot technique…