Giacomo Beccari is a staff astronomer at the European Southern Observatory, Garching. He is a former winner of the Levi-Montalcini Prize and co-author of the Ecology of Blue Straggler Stars (2014). Henri M. J. Boffin is a staff astronomer at the European Southern Observatory, Garching. Recently he has shown the importance of binary stars in explaining planetary nebulae, including discovering the binary star of Fleming 1. He pioneered the use of optical interferometry to study mass transfer in symbiotic stars.

'… the book as a whole is well in line with what one expects from CUP: the texts are well-written, and the illustrations clear. Every department and observatory needs a copy of this book. Every astrophysicist will find something of value.' Elizabeth Griffin, The Observatory

• Introduction; 1. The zoo of binary stars Henri M. J. Boffin; 2. Statistics of binary and multiple stars M. Moe; 3. Gaia and LSST: their importance in binary star research L. Eyer, Nami Mowlavi, Isabelle Lecoeur-Taibi, Lorenzo Rimoldini, Berry Holl, Marc Audard, Simon Hodgkin, Dafydd W. Evans, Lukasz Wyrzykowsi, George Seabroke, Andrej Prša, and Dimitri Pourbaix; 4. Population synthesis of binary stars R. G. Izzard and G. M. Halabi; 5. Low- and intermediate-mass star evolution: open problems M. Salaris; 6. The symbiotic stars U. Munari; 7. Binary post-AGB stars as tracers of stellar evolution H. van Winckel; 8. The importance of binarity in the formation and evolution of planetary nebulae D. Jones; 9. Massive star evolution: binaries as two single stars C. Georgy and S. Ekström; 10. Binarity at high masses H. Sana; 11. Luminous blue variables: their formation and instability in the context of binary interactions A. Mehner; 12. Type Ia supernovae: where are they coming from and where will they lead us? F. Patat and N. Hallakoun; 13. Binary interactions and gamma-ray bursts N. R. Tanvir; 14. Binaries as sources of gravitational waves G. Nelemans; 15. The impact of binaries on the stellar initial mass function P. Kroupa and T. Jerabkova; 16. The formation of binary stars: insights from theory and observation C. J. Clarke; 17. The Maxwell's demon of star clusters M. Mapelli; 18. Alternative stellar evolution pathways R. D. Mathieu and E. M. Leiner; 19. Clocks and scales: playing with the physics of blue stragglers F. R. Ferraro and B. Lanzoni; 20. Binaries at very low metallicity S. Lucatello; 21. Population and spectral synthesis: it doesn't work without binaries J. J. Eldridge and E. R. Stanway.

Giacomo Beccari is a staff astronomer at the European Southern Observatory, Garching. He is a former winner of the Levi-Montalcini Prize and co-author of the Ecology of Blue Straggler Stars (2014). Henri M. J. Boffin is a staff astronomer at the European Southern Observatory, Garching. Recently he has shown the importance of binary stars in explaining planetary nebulae, including discovering the binary star of Fleming 1. He pioneered the use of optical interferometry to study mass transfer in symbiotic stars.

'… the book as a whole is well in line with what one expects from CUP: the texts are well-written, and the illustrations clear. Every department and observatory needs a copy of this book. Every astrophysicist will find something of value.' Elizabeth Griffin, The Observatory

• Introduction; 1. The zoo of binary stars Henri M. J. Boffin; 2. Statistics of binary and multiple stars M. Moe; 3. Gaia and LSST: their importance in binary star research L. Eyer, Nami Mowlavi, Isabelle Lecoeur-Taibi, Lorenzo Rimoldini, Berry Holl, Marc Audard, Simon Hodgkin, Dafydd W. Evans, Lukasz Wyrzykowsi, George Seabroke, Andrej Prša, and Dimitri Pourbaix; 4. Population synthesis of binary stars R. G. Izzard and G. M. Halabi; 5. Low- and intermediate-mass star evolution: open problems M. Salaris; 6. The symbiotic stars U. Munari; 7. Binary post-AGB stars as tracers of stellar evolution H. van Winckel; 8. The importance of binarity in the formation and evolution of planetary nebulae D. Jones; 9. Massive star evolution: binaries as two single stars C. Georgy and S. Ekström; 10. Binarity at high masses H. Sana; 11. Luminous blue variables: their formation and instability in the context of binary interactions A. Mehner; 12. Type Ia supernovae: where are they coming from and where will they lead us? F. Patat and N. Hallakoun; 13. Binary interactions and gamma-ray bursts N. R. Tanvir; 14. Binaries as sources of gravitational waves G. Nelemans; 15. The impact of binaries on the stellar initial mass function P. Kroupa and T. Jerabkova; 16. The formation of binary stars: insights from theory and observation C. J. Clarke; 17. The Maxwell's demon of star clusters M. Mapelli; 18. Alternative stellar evolution pathways R. D. Mathieu and E. M. Leiner; 19. Clocks and scales: playing with the physics of blue stragglers F. R. Ferraro and B. Lanzoni; 20. Binaries at very low metallicity S. Lucatello; 21. Population and spectral synthesis: it doesn't work without binaries J. J. Eldridge and E. R. Stanway.