Horizontal Branch Stars: The Interplay between Observations and Theory, and Insights into the Formation of the Galaxy

We review HB stars in a broad astrophysical context, including both variable and non-variable stars. A reassessment of the Oosterhoff dichotomy is presented, which provides unprecedented detail regarding its origin and systematics. We show that the Oosterhoff dichotomy and the distribution of globular clusters (GCs) in the HB morphology-metallicity plane both exclude, with high statistical significance, the possibility that the Galactic halo may have formed from the accretion of dwarf galaxies resembling present-day Milky Way satellites such as Fornax, Sagittarius, and the LMC. A rediscussion of the second-parameter problem is presented. A technique is proposed to estimate the HB types of extragalactic GCs on the basis of integrated far-UV photometry. The relationship between the absolute V magnitude of the HB at the RR Lyrae level and metallicity, as obtained on the basis of trigonometric parallax measurements for the star RR Lyrae, is also revisited, giving a distance modulus to the LMC of (m-M)_0 = 18.44+/-0.11. RR Lyrae period change rates are studied. Finally, the conductive opacities used in evolutionary calculations of low-mass stars are investigated. [ABRIDGED]Comment: 56 pages, 22 figures. Invited review, to appear in Astrophysics and Space Scienc

The photographic light-curve of SX Aurigae

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Note on the eclipsing variable GN Normae

The plaintiffs brought a stockholders\u27 derivative suit in a federal district court, claiming that defendant directors had violated section 10 (b) of the Securities and Exchange Act of 1934 and rule X-10B-5 of the Securities and Exchange Commission. It was alleged that defendants who controlled as majority of the capital stock of the Algoma Coal and Coke Co., had purchased for the Algoma Company stock in two other corporations which they had formed and had manipulated the affairs of the Algoma Company so that business profits were diverted to those other corporations, thereby securing profits to themselves at the expense of plaintiff stockholders. On defendants\u27 motion to dismiss for failure to state a cause of action arising under the Securities and Exchange Act of 1934, held, motion granted. The Securities and Exchange Act of 1934 confers on the federal courts exclusive jurisdiction only over those actions involving a right of recovery that goes beyond the common law rights that could be fully adjudicated and enforced by an appropriate action in a state court. Beury v. Beury, (D.C. W.Va. 1954) 127 F. Supp. 786

Remark on the photographic magnitudes in the Yale Zone Catalogue between declinations +20° and +30°

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Note on the period of variables 15 and 40 in M 53

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On the variability of the period of RR Leonis

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A new semi-regular variable star

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Improved elements of 7 variable stars

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