Other
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.233..887i&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 233, Aug. 15, 1988, p. 887-898. Research supported by M
Other
25
Astronomical Photometry, Chromosphere, H Alpha Line, K Lines, Late Stars, Stellar Spectra, Emission Spectra, High Resolution, Line Spectra, Radial Velocity, Stellar Rotation
Scientific paper
High-resolution spectroscopic data on the rapidly rotating late-type stars AB Dor (HD 36705) and PZ Tel (HD 174429) are presented. Both stars show chromospheric activity, with strong Ca II K emission and a filled-in H-alpha line, as noted previously by other workers. No apparent relationship holds between the level of H-alpha filling and rotation phase for either star. In one observing run of a few days there was a clear anticorrelation between the strength of Ca II K emission and the photometric wave for AB Dor. There is some indication, although the data are sparse, that this also occurred in an earlier observing run. For PZ Tel, lack of data prevents any conclusion about a possible relationship between the strength of Ca II K emission and the photometric wave. The radial velocity data strongly suggest that both stars are single.
Coates D. W.
Innis John L.
Thompson Kevin
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