73 citations · 452 across the 43 of their papers we have counts for
43 papers
Detection of a large-scale organized 2 kG order magnetic field in the Herbig Ae star HD179218
S. P. Järvinen, S. Hubrig, M. Schöller +5
While about two dozen Herbig Ae/Be stars have been reported to be magnetic, only two of them, HD101412 and HD190073, have had their magnetic field geometries studied in the past. T…
The magnetic fields in Be stars are stronger than previously suggested
S. Hubrig, S. P. Järvinen, M. Schöller +1
Recent observational studies suggest that Be stars most likely are formed through the process of mass transfer in binary systems. In view of the wide consensus that the origin of t…
TESS detections of pulsations in Of?p stars in the Magellanic Clouds
S. Hubrig, R. Jayaraman, S. P. Järvinen
We used TESS observations to search for pulsations in six known Of?p stars in the Magellanic Clouds. We find evidence for pulsational variability in three Of?p stars: UCAC4 115-008…
Magnetic field of the roAp star KIC~10685175: observations versus theory
Fangfei Shi, Huawei Zhang, Swetlana Hubrig +5
KIC 10685175 is a roAp star whose polar magnetic field is predicted to be 6 kG through a non-adiabatic axisymmetric pulsation theoretical model. In this work, we aim to measure the…
ANDES, the high resolution spectrograph for the ELT: science goals, project overview and future developments
A. Marconi, M. Abreu, V. Adibekyan +286
The first generation of ELT instruments includes an optical-infrared high-resolution spectrograph, indicated as ELT-HIRES and recently christened ANDES (ArmazoNes high Dispersion E…
Searching for magnetic fields in pulsating A-type stars: the discovery of a strong field in the probable delta Sct star HD340577 and a null result for the gamma Dor star HR8799
S. Hubrig, S. P. Jarvinen, J. D. Alvarado-Gomez +2
Numerous delta Sct and gamma Dor pulsators are identified in the region of the Hertzsprung-Russell diagram that is occupied by chemically peculiar magnetic Ap stars. The connection…
The magnetic, spectroscopic, and photometric variability of the Wolf-Rayet star WR55
S. P. Järvinen, S. Hubrig, R. Jayaraman +2
Studies of magnetic fields in the most evolved massive stars, the Wolf-Rayet stars, are of special importance because they are progenitors of certain types of supernovae. The first…
Magnetic field measurements of sharp-lined Ap stars
S. P. Järvinen, S. Hubrig, R. Jayaraman +2
Previous observations suggested that Ap and Bp stars exhibit a bimodal distribution of surface magnetic field strengths and that actually only few or no stars exist with magnetic d…
The magnetic field of the stripped primary in the upsilon Sgr system, a member of the rare class of hydrogen-deficient binaries
S. Hubrig, S. P. Jarvinen, I. Ilyin +1
We present the results of high-resolution spectropolarimetric observations of the optically dominant component in the rare hydrogen-deficient binary system upsilon Sgr. Only a smal…
Detection of anomalous element distribution in the extremely slowly rotating magnetic O9.7 V star HD 54879
S. P. Järvinen, S. Hubrig., M. Schöller +4
The O9.7 V star HD 54879 is currently the only massive magnetic star whose magnetic field geometry and rotation period are not constrained. Over the last three years, we gathered a…
Could the Magnetic Star HD 135348 Possess a Rigidly Rotating Magnetosphere?
Rahul Jayaraman, Swetlana Hubrig, Daniel L. Holdsworth +4
We report the detection and characterization of a new magnetospheric star, HD 135348, based on photometric and spectropolarimetric observations. The TESS light curve of this star e…
A detailed understanding of the rotation-activity relationship using the 300 Myr old open cluster NGC 3532
D. J. Fritzewski, S. A. Barnes, D. J. James +2
The coeval stars of young open clusters provide insights into the formation of the rotation-activity relationship that elude studies of multi-age field populations. We measure the…
The rapidly oscillating Ap star gamma Equ: linear polarization as an enhanced pulsation diagnostic?
S. Hubrig, S. P. Jarvinen, I. Ilyin +2
We present the first short time scale observations of the roAp star gamma Equ in linear polarized light obtained with the PEPSI polarimeter installed at the LBT. These observations…
Giant white-light flares on fully convective stars occur at high latitudes
Ekaterina Ilin, Katja Poppenhaeger, Sarah J. Schmidt +7
White-light flares are magnetically driven localized brightenings on the surfaces of stars. Their temporal, spectral, and statistical properties present a treasury of physical info…
Magnetic field geometry and magnetospheric environment of the strongly magnetic Of?p star NGC 1624-2
S. P. Järvinen, S. Hubrig, M. Schöller +3
NGC 1624-2 is an O7f?p star with a reported probable polar magnetic field strength 20 kG, which is the strongest magnetic field ever measured in an O-type star. We study the…
The search for magnetic fields in two Wolf-Rayet stars and the discovery of a variable magnetic field in WR55
S. Hubrig, M. Schöller, A. Cikota +1
Magnetic fields in Wolf-Rayet (WR) stars are not well explored, although there is indirect evidence, e.g. from spectral variability and X-ray emission, that magnetic fields should…
The anomalous atmospheric structure of the strongly magnetic Ap star HD166473
S. P. Järvinen, S. Hubrig, G. Mathys +3
High resolution spectropolarimetric observations of the strongly magnetic, super-slowly rotating rapidly oscillating Ap star HD166473 are used to investigate the implications of th…
The near-infrared companion to HD94660 (=KQ Vel)
M. Schöller, C. A. Hummel, S. Hubrig +4
The Bp star HD94660 is a single-lined spectroscopic binary. Some authors have suggested that the unseen companion of at least 2M_sun may be a compact object. We intend to study thi…
Detection of weak magnetic fields in two HgMn stars
S. Hubrig, S. P. Jarvinen, H. Korhonen +4
The main-sequence mercury-manganese (HgMn) stars are known to exhibit large overabundances of exotic elements and, similar to magnetic Ap/Bp stars, are spectrum variables, implying…
The very slow rotation of the magnetic O9.7V star HD54879
S. Hubrig, S. P. Jarvinen, M. Schöller +1
The first FORS2 spectropolarimetric observation of the longitudinal magnetic field of HD54879 of the order of -600G with a lower limit of the dipole strength of ~2kG dates back to…
The chemical composition of the Herbig Ae SB2 system AK Sco (HD152404)
F. Castelli, S. Hubrig, S. P. Jarvinen +1
We investigate the stellar atmospheres of the two components of the Herbig Ae SB2 system AK Sco to determine the elements present in the stars and their abundance. Equal stellar pa…
New evidence for weak magnetic fields in Herbig Ae/Be stars
S. P. Järvinen, T. A. Carroll, S. Hubrig +2
In recent years Herbig Ae/Be stars receive considerable attention as their disks are believed to be the sites of on-going planet formation. Confirming the presence of magnetic fiel…
A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7V star HD54879
S. Hubrig, M. Kueker, S. P. Jarvinen +4
Only eleven O-type stars have been confirmed to possess large-scale organized magnetic fields. The presence of a -600G longitudinal magnetic field in the O9.7V star HD54879 with a…
Mapping EK Draconis with PEPSI - Possible evidence for starspot penumbrae
S. P. Järvinen, K. G. Strassmeier, T. A. Carroll +2
We present the first temperature surface map of EK Dra from very-high-resolution spectra obtained with the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the…