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Title:
Activity cycles in cool stars. 1: Observation and analysis methods and case studies of four well-observed examples
Authors:
Hall, Jeffrey C.; Lockwood, G. W.; Gibb, Erika L.
Affiliation:
AA(Lowell Observatory, Flagstaff, AZ), AB(Lowell Observatory, Flagstaff, AZ), AC(Lowell Observatory, Flagstaff, AZ)
Publication:
Astrophysical Journal (ISSN 0004-637X), vol. 442, no. 2, Part 1, p. 778-793 (ApJ Homepage)
Publication Date:
04/1995
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Cool Stars, Data Bases, Late Stars, Spectrum Analysis, Stellar Rotation, Stellar Spectra, Stellar Spectrophotometry, Continuous Spectra, Data Reduction, H Alpha Line, Numerical Analysis
DOI:
10.1086/175483
Bibliographic Code:
1995ApJ...442..778H

Abstract

This is the first in a series of papers devoted to the ongoing long-term monitoring program of activity cycles in cool stars at Lowell Observatory. In this paper we discuss the various spectral diagnostics we have at our disposal and how we calibrate these diagnostics to flux. We then present our current database for four well-studied stars, HD 10700, HD 22049, HD 39587, and the Sun, comparing our results to results obtained by other investigators and discussing how our new database complements existing work. With the same data we demonstrate our ability to detect activity cycles and rotational modulation in a variety of diagnostic lines for stars of widely differing activity levels and spectral types.

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