5. Observational Data: Detailed Characteristics in the Frequency Domain

Observational Data: Detailed Characteristics in the Frequency Domain

Asteroseismic Data Analysis ◽

10.23943/princeton/9780691162928.003.0005 ◽

2017 ◽

Author(s):

Sarbani Basu ◽

William J. Chaplin

Keyword(s):

Frequency Domain ◽

Observational Data ◽

Frequency Spectrum ◽

Fourier Transforms ◽

Frequency Spectra ◽

The Impact ◽

Frequency Domain Properties

This chapter details the frequency-domain properties of observational data on stars. It is from the analysis of the frequency spectrum of the observations that the asteroseismic parameters are usually extracted. The chapter looks at each of the intrinsic stellar contributions in turn, always with an eye to how each must be handled in the asteroseismic analysis. It also considers the impact on the analysis of gaps in the data. In performing the analyses, this chapter begins by covering practical fundamentals associated with estimation of the frequency spectra, which underpin everything that follows. In addition, this chapter will be making use of Fourier transforms in studying the data.

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Current status of special planetary and lunar theories and ephemerides

Symposium - International Astronomical Union ◽

10.1017/s007418090010556x ◽

1966 ◽

Vol 25 ◽

pp. 266-267

Author(s):

R. L. Duncombe

Keyword(s):

Observational Data ◽

Current Status ◽

Numerical Errors

An examination of some specialized lunar and planetary ephemerides has revealed inconsistencies in the adopted planetary masses, the presence of non-gravitational terms, and some outright numerical errors. They should be considered of temporary usefulness only, subject to subsequent amendment as required for the interpretation of observational data.

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July 11, 1991 Eclipse Corona Photometry by the Results of Electropolarimetric and CCD-Matrix Observations

International Astronomical Union Colloquium ◽

10.1017/s0252921100026051 ◽

1994 ◽

Vol 144 ◽

pp. 567-569

Author(s):

V. Kulidzanishvili ◽

D. Georgobiani

Keyword(s):

Solar Corona ◽

Observational Data ◽

Solar Limb ◽

Ccd Matrix

AbstractThe observational data of July 11, 1991 eclipse solar corona obtained by both electropolarimeter (EP) and CCD-matrix were processed. Using these data, the solar corona photometry was carried out. The results of EP data are compared with the ones of CCD data. It must be noted here that the CCD data give us only characteristics of the inner corona, while the EP data show the features of both the inner and middle corona up to 4R⊙. Standard flattening indexϵis evaluated from both data. The dependence of the flattening index on the distance from the solar limb is investigated. The isophotes in Na and Ca lines are plotted. Based on these data some ideas and conclusions on the type of the solar corona are presented.

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On The Radii of Ap Stars

International Astronomical Union Colloquium ◽

10.1017/s025292110008043x ◽

1976 ◽

Vol 32 ◽

pp. 49-55 ◽

Cited By ~ 1

Author(s):

F.A. Catalano ◽

G. Strazzulla

Keyword(s):

Observational Data ◽

Line Width ◽

Main Sequence ◽

Main Sequence Stars ◽

Ap Stars

SummaryFrom the analysis of the observational data of about 100 Ap stars, the radii have been computed under the assumption that Ap are main sequence stars. Radii range from 1.4 to 4.9 solar units. These values are all compatible with the Deutsch's period versus line-width relation.

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