Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...435.1063a&link_type=abstract
Astronomy and Astrophysics, Volume 435, Issue 3, June I 2005, pp.1063-1071
Astronomy and Astrophysics
Astrophysics
2
Methods: Data Analysis, Techniques: Spectroscopic, Stars: Activity, Stars: Atmospheres, Stars: Imaging, Stars: Starspots
Scientific paper
Similar to the Sun, stellar active regions appear to consist of dark
spots in combination with surrounding bright facular regions.
The present study uses the Doppler imaging technique to recover the
stellar surface structures from simulated spectral observations
obtained from a given theoretical stellar surface.
The objective of the study is to investigate how the recovered
surface structure depends on observing parameters such as rotational
phase coverage, choice of spectral lines, signal-to-noise ratio, and
projected equatorial rotational velocity.
The inversions demonstrate that those stellar surface active
regions with high temperature contrast in both longitudinal and
latitudinal directions can be satisfactorily reproduced using
Doppler imaging.
Observations must, however, fulfill such strict conditions that
a complete reconstruction is somewhat unrealistic.
Nevertheless, in a more realistic example, the hot facular areas
result in quite distinct and easily recognizable features on the
stellar surface map, even though they are not completely
reconstructed.
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