Period variations in the Beta Cep star β Cru

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Central Research Unit The views expressed in this report are those of the researchers and do not necessarily represent those of the Department or Scottish Ministers. Further copies of this report are available priced £5.00. Cheques should be made payable to The Stationery Office Ltd and addressed to: ACKNOWLEDGEMENTS We would like to acknowledge the patience and time of the great many people, o...

The Nature of the Hard-x-ray Emitting Symbiotic Star Rt Cru

We describe Chandra High-Energy Transmission Grating Spectrometer observations of RT Cru, the first of a new sub-class of symbiotic stars that appear to contain white dwarfs (WDs) capable of producing hard X-ray emission out to greater than 50 keV. The production of such hard X-ray emission from the objects in this sub-class (which also includes CD −57 3057, T CrB, and CH Cyg) challenges our un...

Confirmation of the Planet Hypothesis for the Long-period Radial Velocity Variations of β Geminorum

Our aim is to confirm the nature of the long period radial velocity measurements for β Gem first found by Hatzes & Cochran (1993). We present precise stellar radial velocity measurements for the K giant star β Gem spanning over 25 years. An examination of the Ca II K emission, spectral line shapes from high resolution data (R = 210,000), and Hipparcos photometry was also made to discern the tru...

Spatial Variations of β-Convergence Coefficient in Asia (The GWR Approach)

Variations of the Ap star HDE 318107 ? , ? ?

The rotation period of the Ap star HDE 318107 has been determined from magnetic and photometric observations obtained between August 1992 and September 1998.