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- W2079278809 abstract "view Abstract Citations (16) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Reassessment of Some Polarization Standard Stars Clarke, D. ; Naghizadeh-Khouei, J. Abstract There have been recent reports suggesting that several polarized standard stars exhibit variability. In the investigation here, we concentrate on the work of Bastien et al. (AJ, 495, 900 (1988)) who claim that the majority of their measurements reveal instability of the cataloged standards (11 stars out of 13). We criticize their statistical assessments and comment on the shortcomings in their data and analyses. Firstly, it is demonstrated that their test based on comparisons of internal and external variances does not give rise to criteria for assessing variability. Secondly, their normality tests based on kurtosis and skewness are also shown to be fallacious and that in any case they lack rigor. Problems with the homogeneity of the observations are discussed with respect to dead-time corrections, instrumental polarization and modulation efficiency, all of which may give rise to variable systematic errors within the pooled data. For four stars which have sufficient homogeneous measurements, tests previously used on catalogs of unpolarized stars have been adopted to investigate the data and only one star (HD 111613) provides firm evidence for variability. Publication: The Astronomical Journal Pub Date: August 1994 DOI: 10.1086/117105 Bibcode: 1994AJ....108..687C Keywords: Early Stars; Giant Stars; Kurtosis; Polarimetry; Skewness; Astronomical Catalogs; Rayleigh Distribution; Astrophysics; POLARIZATION; STARS: CHROMOSPHERES full text sources ADS | data products SIMBAD (17)" @default.
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- W2079278809 title "A reassessment of some polarization standard stars" @default.
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