Issuu on Google+

Silvio Alejandro Urizar Salazar Applied Physics USAC October 17, 2013


What is a binary star?   Characteristics  Classiffications  Examples


How do we analyze them?   Two body problem  Center of mass “barycenter”  Reduced mass


Possible Binary Systems   Detached

 Semidetached

 Contact


Roche Lobes ď‚–


Roche lobes   Definition  Lagrangian point


Accretion   Mass accummulation  Eddington Rate  Angular velocity of the disk


Massive Binary Stars   Star masses greater than 10MS  Neutron stars  White dwarfs  Black holes


HMXB   High Mass X-Ray Binaries  Compact object and massive star  Mass loss due to solar wind  X-ray lower than LMXB


Examples   R144 (Magellanic Cloud)  MT070, MT103 (Cygnus OB2)  Binary neutron stars


References   Benaquista Mathew, An Introduction to the Evolution of Single and Binary Stars, University of Texas.  Astronomy Magazine, Most massive binary star, http://www.astronomy.com/~/link.aspx?_id=42708e21-a2934eff-9e1b-4826c8c6b027  Lecture 16, evolution of binary stars, http://www2.astro.psu.edu/users/rbc/a1/lec16n.html  A Fresh Catch of Massive Binary Stars at Cygnus OB2, http://arxiv.org/pdf/1206.6742v1.pdf  Roche lobes, http://en.wikipedia.org/wiki/Roche_lobe  Space.com, Binary Star Systems: Classification and Evolution, http://www.space.com/22509-binary-stars.html


Massive star binary systems