151 citations · 884 across the 28 of their papers we have counts for
14 papers · 1 filter
A MUSE view of the asymmetric jet from HD 163296
C. Xie, S. Y. Haffert, J. de Boer +5
Jets and outflows are thought to play important roles in regulating star formation and disk evolution. HD 163296 is a well-studied Herbig Ae star that hosts proto-planet candidates…
Discovery of a directly imaged disk in scattered light around the Sco-Cen member Wray 15-788
A. J. Bohn, M. A. Kenworthy, C. Ginski +10
As part of our on-going survey we have carried out high-contrast imaging with VLT/SPHERE/IRDIS to obtain polarized and total intensity images of the young (Myr old)…
Surprising detection of an equatorial dust lane on the AGB star IRC+10216
S. V. Jeffers, M. Min, L. B. F. M. Waters +6
Understanding the formation of planetary nebulae remains elusive because in the preceding asymtotic giant branch (AGB) phase these stars are heavily enshrouded in an optically thic…
Imaging the circumstellar environment of the young T Tauri star SU Aurigae
S. V. Jeffers, M. Min, H. Canovas +2
The circumstellar environments of classical T Tauri stars are challenging to directly image because of their high star-to-disk contrast ratio. One method to overcome this is by usi…
Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 I. Spectropolarimetric observations in all four Stokes parameters
N. Rusomarov, O. Kochukhov, N. Piskunov +8
High-resolution spectropolarimetric observations provide simultaneous information about stellar magnetic field topologies and three-dimensional distributions of chemical elements.…
Constraining the Circumbinary Envelope of Z CMa via imaging polarimetry
H. Canovas, M. Min, S. V. Jeffers +2
Z CMa is a complex binary system, composed of a Herbig Be and an FU Ori star. The Herbig star is surrounded by a dust cocoon of variable geometry, and the whole system is surrounde…
Direct imaging of a massive dust cloud around R Coronae Borealis
S. V. Jeffers, M. Min, L. B. F. M. Waters +5
We present recent polarimetric images of the highly variable star R CrB using ExPo and archival WFPC2 images from the HST. We observed R CrB during its current dramatic minimum whe…
Magnetism, chemical spots, and stratification in the HgMn star phi Phoenicis
V. Makaganiuk, O. Kochukhov, N. Piskunov +7
Mercury-manganese (HgMn) stars have been considered as non-magnetic and non-variable chemically peculiar (CP) stars for a long time. However, recent discoveries of the variability…
No magnetic field in the spotted HgMn star mu Leporis
O. Kochukhov, V. Makaganiuk, N. Piskunov +7
Chemically peculiar stars of the mercury-manganese (HgMn) type represent a new class of spotted late-B stars, in which evolving surface chemical inhomogeneities are apparently unre…
First detection of linear polarization in the line profiles of active cool stars
O. Kochukhov, V. Makaganiuk, N. Piskunov +6
The application of high-resolution spectropolarimetry has led to major progress in understanding the magnetism and activity of late-type stars. During the last decade, magnetic fie…
Chemical spots in the absence of magnetic field in the binary HgMn star 66 Eridani
V. Makaganiuk, O. Kochukhov, N. Piskunov +7
According to our current understanding, a subclass of the upper main sequence chemically peculiar stars, called mercury-manganese (HgMn), is non-magnetic. Nevertheless, chemical in…
The search for magnetic fields in mercury-manganese stars
V. Makaganiuk, O. Kochukhov, N. Piskunov +7
We performed a highly sensitive search for magnetic fields on a large set of HgMn stars. With the aid of a new polarimeter attached to the HARPS spectrometer at the ESO 3.6m-telesc…
Observations of solar scattering polarization at high spatial resolution
F. Snik, A. G. de Wijn, K. Ichimoto +3
The weak, turbulent magnetic fields that supposedly permeate most of the solar photosphere are difficult to observe, because the Zeeman effect is virtually blind to them. The Hanle…
Statistics of convective collapse events in the photosphere and chromosphere observed with the Hinode SOT
C. E. Fischer, A. G. de Wijn, R. Centeno +2
Aims. Convective collapse, a theoretically predicted process that intensifies existing weak magnetic fields in the solar atmosphere, was first directly observed in a single event b…