Volume 19 number 1 — 1990

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Articles in This Issue

Editorial

• Introduction to Volume 19

  Janet A. Mattei

• Group Photograph

  Anon.

• Papers in the Proceedings of the First European Meeting of the AAVSO

  Anon.

Variable Star Research

• DK Hydrae--A Neglected Eclipsing Binary

  Gerard Samolyk

• EK Comae Berenices: A W UMa Star with Short Period

  Jiri Borovicka

• The Accurate Period of GX Aurigae

  Jiri Borovicka

• Period Changes in the Eclipsing Binaries DG Lacertae and MZ Lacertae

  Jindrich Silhan

• Light-Time Effect in Eclipsing Binaries

  Marek Wolf

• Photometric and Spectrographic Observations of Spica

  Liu Zongli, C. Sterken

• Request for Photometry of Algols

  J. R. W. Heintze

• High and Low Stages of T CrB

  T. Iijima

• The Light Curve of the R Coronae Borealis Star NSV 6708 (V854 Centauri) and the Accuracy of Visual Estimates

  W. A. Lawson, P. L. Cottrell, F. M. Bateson

• Supernova 1989B in M66: An Unusual Type I Supernova?

  Stefan Korth

• Photometry of the Suspected Cataclysmic Variable PG0900+401

  N. A. Lipunova, S. Yu. Shugarov

• Photometric Variations of AS296

  C. Blanco

• Some Results of Hungarian Variable Star Observers

  Attila Mizser, Karoly Szatmary, Istvan Tepliczky

• Pulsating Variable Stars in Binary Systems

  Karoly Szatmary

• The Ongoing Photometric Campaign on BW Vulpeculae

  C. Sterken, G. Busarello, M. Dumont, S. Ferrrand, J. C. Misson, J. Remis

• Visual Observations of XY Lyrae and CH Cygni

  Jerzy Speil

• Middle B-Type Star Variables

  J. M. Le Contel, D. Le Contel

• Statistical Analysis of the Semiregular Variable AR Cephei

  Arunas Kucinskas

• Some Variable Stars Observed by the Scandinavian Variable Star Observers

  Aarre Kellomaki

• Diameter Measurements and Imaging of Mira Variables

  Margarita Karovska

• Off-Centering Errors in Multiaperture Photoelectric Photometry of Galaxies

  G. Busarello, G. Longo, C. Sterken

Variable Star Data

• A Database for Times of Minima of Eclipsing Binaries

  Dieter Lichtenknecker

Instruments, Methods, and Techniques

• An Innovative Telescope Design for CCD Photometry

  John E. F. Baruch

• An Unusual Photoelectric Photometer for Small Telescopes

  Hideo Satoh

• Software Tools for the Variable Star Observer

  J. Gunther

Solar

• The Status of Sunspot Cycle 22 Through July 1990

  Peter O. Taylor