I Evolution of Stars in the Post-Main Sequence Stage.- Evolution of Stars in the Post-Main Sequence Stage.- Disk Instabilities in Hubble-Sandage Variables?.- The Frequency of Cepheid Binaries.- Search for Pulsating Stars in Multiple Stellar Systems.- An AD HOC Hypothesis on the Pulsation of Delta Scuti Stars.- On the Internal Structure of Main-Sequence Stars.- A Study of the Orbital Periods of 22 Eclipsing Binaries.- On the Group Formation of Stars in Stellar Associations.- The Age of the Triple System HD 165590.- Properties of Relativistic Linear Stellar Models.- II Evolutionary Trends in Wide Binary Systems.- Evolutionary Trends in Wide Binaries.- A Note about Multiple Systems of Dense Molecular Clouds.- Trapezium Type Multiple Systems and Formation of Stars.- A Hypothesis on the Richness of a Galaxy in Binary Stellar Systems.- A Mass-Eccentricity Correlation in Spectroscopic and Visual Binary Orbits.- Photometric Investigation of Visual Binaries with a Component above the Main Sequence.- On the Distribution of Young Spectroscopic Binary Stars over the Major Semiaxes of their Orbits.- Observational Selection in Spectroscopic Binary Eccentricities.- Double Stars: The Closest and the Most Distant Systems.- The Evolutionary State of Zeta Aurigae.- III Evolutionary Processes in Close Binary Systems.- Evolution of Close Binary Stars: Observational Aspects.- Statistical Properties of Algol-Type Systems.- Mass Loss in Algol-Type Stars: Implication on their Evolutionary Stage.- Ultraviolet Light Curves of U Geminorum and VW Hydri.- Statistical Models for Close Binaries.- Structure and Evolution of SV Centauri.- Age Determination in CW ERI = BV 1000.- Numerical Calculations for Accretion Disks in Close Binary Systems.- Quasi-Simultaneous Photometric and Polarimetric Observations of T TAU and RY TAU.- S CNC as a Case Study of Classical Algol Evolution.- Structural Models for Beta Lyrae-Type Disks.- Evolutionary Effects in Contact Binaries.- Evolutionary Possibilities and Impossibilities for Solar Type Contact Binaries in NGC 188.- Origin and Evolution of Contact Binaries of W UMA Type.- Some aspects of the Evolutionary Status of W Ursae Majoris Binaries Deduced from Observational Data.- A Possible Explanation of Distortions in the Light Curves of VW CEP by Starspots.- The IUE Observations of W UMA.- Mass Flow due to Heating in a Binary System: Application to U Cephei.- The Very Unusual Ultraviolet Spectra of R Arae.- On a Possible Linkage between W-Type W UMA Systems and the Short Period Rscvn-Like Binaries.- Recent Observational Evidence on W Ursae Majoris Stars.- The Time Change of the AW UMA System.- The Short-Period Non-Contact Binary Systems UU Lyn and GR TAU.- On the Spatial Density of W UMA Type Stars.- IV Cataclysmic Binaries and their Role in Stellar Evolution.- Binary Stars and SS433.- Observations of Secular Changes in the Kinematic Model of SS433.- Time Resolved Circular Polarimetry of White Dwarf Pulsars.- The Mass Distribution of White Dwarfs and Central Stars of Planetary Nebulae.- Abundance Peculiarities in White Dwarf Atmospheres as a Result of Binary Evolution?.- The Minimum Orbital Period of Hydrogen-Rich Cataclysmic Binaries.- Remarks on the Evolutionary Status of Cataclysmic Variables.- Supernovae in Binary Systems: Production of Runaway Stars and Pulsars.- An Optical Burst in SCO X-1.- The Formation of Massive White Dwarfs in Cataclysmic Binaries.- UV Spectroscopy of the Novalike Variable TT Arietis.- The Subdwarf Eclipsing Binary LB3459 (AA DOR).- Variability of Soft X-Ray Emission of Ex Hydrae Observed with Einstein Observatory.- On the Possible Short-Period Irregular Light Fluctuations of V1357 Cyg = Cyg X-1.- PU Vulpeculae (Object Honda-Kuwano 1979) - A Possible Short-Period Relative of the Symbiotic Stars.- DID SU UMA Undergo a Classical Nova Outburst?.- Does the Cataclysmic Binary Z Cha Contain a Black Dwarf Secondary?.- Concluding Remarks.

Binary and multiple stars as tracers of stellar evolution. Proceedings of the 69th Colloquium of the International Astronomical Union, held in Bamberg, F.R. Germany, August 31 - September 3, 1981.

Introduction and guide to the data

Abundant HIPPARCOS photometry over 3 years of 141 O and Wolf-Rayet stars, including 8 massive X-ray binaries, provides a magnificent variety of light curves at the sigma similar to 1-5% level. Among the most interesting results, we mention: optical outbursts in HD 102567 (MXRB), coinciding with periastron passages; drastic changes in the light curve shape of HD 153919 (MXRB); previously unknown long-term variability of HD 39680 (O6V:[n]pe vat) and WR 46 (WN3p); unusual flaring of HDE 308399 (O9V); ellipsoidal variations of HD 64315, HD 115071 and HD 160641; rotationally modulated variations in HD 6681 1=zeta Pup (O4Inf) and HD 210839=lambda Cep(O6I(n)fp); dust formation episode in WR 121 (WC9). In a statistical sense, the incidence of variability is slightly higher among the WR stars, which might be explained by the higher percentage of known binary systems. Among the presumably single WR stars, the candidate runaways appear to be more variable then the rest.

/pdf/wolf-rayet-stars-and-o-star-runaways-with-hipparcos-ii-1i1d2frwf3.pdf

Wolf-Rayet stars and O-star runaways with HIPPARCOS - II. Photometry

/pdf/colliding-winds-in-wolf-rayet-binaries-57hpglp5js.pdf

Colliding winds in Wolf-Rayet binaries

Since the Cosmic Dawn, massive stars have been playing a crucial role as the chemical recycling engines of galaxies that enable the birth of new stars and planetary systems, not only through the strong winds that they exhibit during their relatively short lifetimes, but also through their catastrophic endings as supernovae, and even with occasional posthumous kilonovae events resulting from binary neutron star mergers and neutron star/black hole mergers. Hence, understanding the structures of massive stars and their winds is key to understanding galactic ecosystems. One tool that has proven to be very powerful in constraining the structures of various types of stars is the study of physical phenomena causing observable stellar light variability. Among massive stars, the O-type star ζ Puppis is considered the archetype of a hot, massive star and is almost always invoked in massive star studies. This article presents a highlight review of key results yielded by monitoring efforts of ζ Pup across different wavelength ranges thus far.

https://www.mdpi.com/2218-1997/8/10/514/pdf?version=1666667641

Massive Stars as the Radiant Queens of the Universe—The Case of ζ Puppis

Abundant HIPPARCOS photometry over 3 years of 141OandWolf-Rayetstars,including8massiveX-raybinaries, provides a magnicent variety of light curves at the 1-5% level. Among the most interesting results, we mention: opti- cal outbursts in HD 102567 (MXRB), coinciding with perias- tron passages; drastic changes in the light curve shape of HD 153919 (MXRB); previously unknown long-term variability of HD 39680 (O6V:(n)pe var) and WR 46 (WN3p); unusual flar- ing of HDE 308399 (O9V); ellipsoidal variations of HD 64315, HD 115071 and HD 160641; rotationally modulated variations inHD66811= Pup(O4Inf)andHD210839=Cep(O6I(n)fp); dust formation episode in WR 121 (WC9). In a statistical sense, the incidence of variability is slightly higher among the WR stars, which might be explained by the higher percentage of knownbinarysystems.AmongthepresumablysingleWRstars, thecandidaterunawaysappeartobemorevariablethentherest.

/pdf/wolf-rayet-stars-and-o-star-runaways-with-hipparcos-58kxy2w4ky.pdf

Wolf-Rayet stars and O-star runaways with HIPPARCOS

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Wolf-Rayet stars and O-star runaways with HIPPARCOS