I have always been interested in astrophysics but my career took another direction and I have an MS in computer science. I wanted to go back and revive my interest. I have decent math/calculus background, ODE, PDE, numerical methods including solving PDE/ODEs, some linear algebra and vectors. I have basic working knowledge of analytical/algebraic geometery. I have read lot of stuff on astronomy but most of the ameture lit. is not satsifying in that there are no details and no mathematical treatment or explainations (e.g. scientific american). I wanted to get started with some good text books on the subject that has good conceptual and mathematical detail of the concepts. e.g. I want to know how to use the various distance measuring methods, like, statistical paralex...,I want to understand and know how to calculate the mass of a star...and continue to harder more in depth topics as I master these fundamentals. I have undergraduate physics and some graduate math/calculus so I think I can handle the physicis and math in the basic astrophysics stuff (I am purposely avoiding the use of astronomy, as I get refs. to star gazing/charts. telescopes etc. and I am really interested in the physics). Any good recommendations would be appreciated. Thanks. P.S. someone recommended Astrophysics by Ostllie and Carrolls, but as I am starting out I don't know if that is a good choice.