24 citations · 83 across the 10 of their papers we have counts for
10 papers
GALEX UV survey of magnetic chemically peculiar stars in the Kepler prime field
Emanuele Bertone, Stefan Hümmerich, Miguel Chávez +8
Magnetic chemically peculiar (mCP) stars are strongly magnetic upper main-sequence stars that exhibit light rotational variability due to an uneven surface distribution of certain…
A new sample of super-slowly rotating Ap (ssrAp) stars from the Zwicky Transient Facility survey
S. Hümmerich, K. Bernhard, E. Paunzen
The magnetic chemically peculiar Ap stars exhibit an extreme spread of rotational velocities, the reason of which is not well understood. Ap stars with rotational periods of 50 day…
Searching for shell stars in LAMOST DR4 by probing the Fe 42 multiplet lines
S. Huemmerich, E. Paunzen, K. Bernhard
Shell stars, in particular the cooler ones, often do not show conspicuous Balmer-line emission and may consequently be missed in surveys that specifically search for emission signa…
New magnetic chemically peculiar stars and candidates in the ATLAS First Catalog of Variable Stars
Klaus Bernhard, Stefan Huemmerich, Ernst Paunzen +1
The number of known variable stars has increased by several magnitudes over the last decade, and automated classification routines are becoming increasingly important to cope with…
Magnetic chemically peculiar stars investigated by the Solar Mass Ejection Imager
E. Paunzen, J. Supikova, K. Bernhard +2
Since the discovery of the spectral peculiarities of their prototype alpha2 Canum Venaticorum in 1897, the so-called ACV variables, which are comprised of several groups of chemica…
V680 Mon -- a young mercury-manganese star in an eclipsing heartbeat system
E. Paunzen, S. Huemmerich, M. Fedurco +3
Chemically peculiar stars in eclipsing binary systems are rare objects that allow the derivation of fundamental stellar parameters and important information on the evolutionary sta…
A revisit to the enigmatic variable star 21 Comae
Ernst Paunzen, Gerald Handler, Przemyslaw Walczak +12
The magnetic chemically peculiar (Ap/CP2) star 21 Com has been extensively studied in the past, albeit with widely differing and sometimes contradictory results, in particular conc…
Global properties of the light curves of magnetic, chemically peculiar stars as a testbed for the existence of dipole-like symmetry in surface structures
M. Jagelka, Z. Mikulášek, S. Hümmerich +1
Magnetic, chemically peculiar stars are known for exhibiting surface abundance inhomogeneities (chemical spots) that lead to photometric and spectroscopic variability with the rota…
Search for stellar spots in field blue horizontal-branch stars
E. Paunzen, K. Bernhard, S. Huemmerich +3
Blue horizontal-branch stars are Population II objects which are burning helium in their core and possess a hydrogen-burning shell and radiative envelope. Because of their low rota…
HD66051, an eclipsing binary hosting a highly peculiar, HgMn-related star
Ewa Niemczura, Stefan Hümmerich, Fiorella Castelli +4
HD66051 is an eclipsing system with an orbital period of about 4.75 d that exhibits out-of-eclipse variability with the same period. New multicolour photometric observations confir…