Some Interesting Binaries
- Algols
- Semidetached systems with main sequence primary and evolved secondary
- Slow phase of mass transfer
- Rapid rotators are a sub-class that may connect W Ser systems with normal Algols
- W UMa Systems
- Overcontact systems with components of different mass but very similar temperatures
- Details of structure not well-understood
- Asymmetries in light curves that change on short timescales
- RS CVn Systems
- Detached systems with F or G-type primary and K subgiant secondary
- Enormous cool spots that migrate on a yearly timescale
- W Ser Systems
- Semidetached systems in or just past the rapid phase of mass transfer
- Strong emission lines in the UV
- Precursors of Algols?
- Epsilon Aur
- ~27 year period, longest known eclipsing system
- Flat-bottomed primary eclipse but primary is visible spectroscopically
- Best model of secondary is a tilted disk with an embedded binary