215 citations · 238 across the 9 of their papers we have counts for
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An Investigation of Four Chemically Peculiar Stars with Photometric Periods below 12 Hours
Stefan Hümmerich, Klaus Bernhard, Ernst Paunzen +3
We present an investigation of three chemically peculiar (CP) stars and one CP star candidate which exhibit photometric periods below 12 hours. New spectroscopic observations have…
A New Sample of Mid-Infrared Bright, Long-Period Mira Variables from the MACHO Galactic Bulge Fields
Klaus Bernhard, Stefan Uttenthaler, Stefan Hümmerich
Mid-infrared bright objects in the direction of the Galactic Bulge were investigated using time series photometry from the MACHO data archive, which led to the discovery of a large…
An investigation of the RCB star candidate GDS J0702414-023501
Stefan Huemmerich, Klaus Bernhard
2MASS J07024146-0235017 = GDS J0702414-023501 was included in the "Catalogue enriched with R CrB stars" on grounds of its near- and mid-infrared colours. The object, which correspo…
HD 240121 - an ACV variable showing anti-phase variations of the B and V light curves
Rainer Gröbel, Stefan Hümmerich, Ernst Paunzen +1
The variability of HD 240121 = BD+59 2602 was first suspected by Särg & Wramdemark (1970) and later confirmed by Gröbel (1992a,b). Because of the observed anti-phase variations of…
NSV 1907 - A new eclipsing, nova-like cataclysmic variable
Stefan Hümmerich, Rainer Gröbel, Franz-Josef Hambsch +6
NSV 1907, formerly listed as an irregular variable in variability catalogues, was classified as an Algol-type eclipsing binary in the Catalina Surveys Periodic Variable Star Catalo…
A radio pulsing white dwarf binary star
T. R. Marsh, B. T. Gänsicke, S. Hümmerich +23
White dwarfs are compact stars, similar in size to Earth but ~200,000 times more massive. Isolated white dwarfs emit most of their power from ultraviolet to near-infrared wavelengt…