Rotational modulation in IUE spectra of cool dwarf chromospheres: Data analysis and period search techniques

Details Rotational modulation in IUE spectra of cool dwarf chromospheres: Data analysis and period search techniques Rotational modulation in IUE spectra of cool dwarf chromospheres: Data analysis and period search techniques

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..165a&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 165-16

Astronomy and Astrophysics

Astrophysics

Chromosphere, Cool Stars, Dwarf Stars, Iue, Rotational Spectra, Stellar Rotation, Stellar Spectra, F Stars, K Stars, Stellar Activity, Time Series Analysis, Ultraviolet Spectra

Scientific paper

The authors have obtained IUE spectra of a number of bright F-K dwarfs in order to investigate rotational modulation in several important chromospheric and transition region emission lines. They have employed Stellingwerf's phase dispersion minimization (PDM) technique as the basis of their time series analysis. Sampling-related aliases are found to dominate the PDM spectra in these sparsely sampled, irregularly spaced time series. The star chosen to illustrate these techniques is ɛ Eridani, a young, chromospherically active K2 dwarf. The authors find strong indications of a rotation period close to 2.8 days in ɛ Eri from two seasons of observations, with some evidence for the persistence in longitude of the active area(s) over several hundred rotation cycles.

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