Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.291..658d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 291, p. 658
Astronomy and Astrophysics
Astronomy
614
Stellar Spectra, Polarimetry, Stellar Atmospheres, Astronomical Spectroscopy, Late Stars
Scientific paper
This paper reports the results of five years (five runs, 23 nights) of spectropolarimetric observations of active stars with the UCL Echelle Spectrograph of the Anglo-Australian Telescope. A total of 225 circularly (and four linearly) polarized spectra were recorded on 28 objects (21 active stars and seven calibration standards) using the new technique of Zeeman-Doppler imaging. To extract polarization echelle spectra from raw frames, we developed a new dedicated automatic software package (called ESPRIT, which utilizes optimal extraction techniques) whose detailed description is given. For each recorded spectrum, we extract 'mean' polarized and unpolarized profiles using 'least-squares deconvolution', a technique similar to cross-correlation, which can enhance enormously the sensitivity of Zeeman-Doppler imaging, by up to 7.5 mag in flux with respect to a single average line analysis. Magnetic field is detected unambiguously on 14 objects. Marginal field detections are also obtained for the weak-line T Tauri star HD 283572 and the Herbig Ae star HD 104237.
Carter Brad D.
Collier Cameron Andrew
Donati Jean-Francois
Rees David E.
Semel Meir
No associations
LandOfFree
Spectropolarimetric observations of active stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spectropolarimetric observations of active stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectropolarimetric observations of active stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-924318