Multivariate analysis of some ultrashort period Cepheids /USPC/

Details Multivariate analysis of some ultrashort period Cepheids /USPC/ Multivariate analysis of some ultrashort period Cepheids /USPC/

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....99..397f&link_type=abstract

Astronomy and Astrophysics, vol. 99, no. 2, June 1981, p. 397-399.

Astronomy and Astrophysics

Astrophysics

2

Astrometry, Cepheid Variables, Multivariate Statistical Analysis, Star Clusters, Stellar Oscillations, Classifications

Scientific paper

Multivariate analysis has been applied to 105 USPC classified by Eggen (1979) as USPC in the Hyades and Praesepe clusters ("Standard" in the present paper), "Young disk"USPC, "Old disk", and arranged by us in other five groups: "All USPC" ,"Small period", "Large period", "Small amplitude" and "Large amplitude" USPC.
Similarity among the "Large amplitude", "Standard" and "Old disk" USPC has been found. Heterogeneity in the pulsations of "Young disk" USPC, physical homogeneity in the "Standard" and "Old disk" USPC has been supposed. Possible causes of the homogeneity of pulsation in the latter two groups are inferred from the belongings to clusters of the "Standard" group and from the greater number of blue stragglers in the "Old disk" group.

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