140 citations
- Iowa State UniversityUS8 papers
- California Institute of TechnologyUS3 papers
- European Southern ObservatoryCL3 papers
- Foundation for Research and Technology HellasGR3 papers
- University of CreteGR3 papers
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- Eureka ScientificUS2 papers
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15 papers · 1 filter
Spectropolarimetric Variability and Co-Rotating Structure in HD 92207
R Ignace, S Hubrig, M Scholler
We report on low resolution (R~3000) spectropolarimetry of the A0 supergiant star HD 92207. This star is well-known for significant spectral variability. The source was observed on…
Magnetic field measurements of O stars with FORS1 at the VLT
S. Hubrig, M. Schoeller, R. S. Schnerr +3
The presence of magnetic fields in O-type stars has been suspected for a long time. The discovery of such fields would explain a wide range of well documented enigmatic phenomena i…
An Assessment of Broadband Optical Colours as Age Indicators for Star Clusters
M. Hancock, B. J. Smith, M. L. Giroux +1
We present an empirical assessment of the use of broadband optical colours as age indicators for unresolved extragalactic clusters and investigate stochastic sampling effects on in…
The Effects of Clumps in Explaining X-ray Emission Lines from Hot Stars
J. P. Cassinelli, R. Ignace, W. L. Waldron +3
It is now well established that stellar winds of hot stars are fragmentary and that the X-ray emission from stellar winds has a strong contribution from shocks in winds. Chandra hi…
Stochastic `Beads on a String' in the Accretion Tail of Arp 285
B. J. Smith, C. Struck, M. Hancock +6
We present Spitzer infrared, GALEX UV, and SDSS and SARA optical images of the peculiar interacting galaxy pair Arp 285 (NGC 2856/4), and compare with a new numerical model of the…
Phase-dependent X-ray observations of the beta Lyrae system: No eclipse in the soft band
R. Ignace, L. M. Oskinova, W. L. Waldron +2
We report on observations of the eclipsing and interacting binary beta Lyrae from the Suzaku X-ray telescope. This system involves an early B star embedded in an optically and geom…