... vcm = sum(p)/sum(m) # velocity of center of mass p = p-m*vcm # make total initial momentum equal zero dt = 50.0 Nsteps = 0 pos = pos+(p/m)*(dt/2.) # initial half-step time = clock() Nhits = 0 while 1: rate(50) L *= 1.0+h0*dt con = 1.0*G*Nstars*Msun/(L*L*L ...
... In the infrared, the nebula can be mapped in the 2.122 m 1-0 S(1) and 2.248 m2-1 S(1) lines of molecular hydrogen, which in most objects seem to be fluorescently excited by UV radiation from the central star. ...
... 2 Astrophysical Gas Dynamics: Bubbles 17/72 Consider the ram-pressure (dynamic pressure) of a radially flowing wind: § M2 = -------------- v 2 v 4 vr 2 §v M = ----------(3) 2 4r § н 12 M v r н2 = 5.2 10 N/m2 ...
... Shocks (39) 30/47 The pre- and post-shock Mach numbers are given by: p2 1 + + 1 ----p1 2M x 1 = --------------------------------------------2 p1 1 + + 1 ----p2 2M x 2 = --------------------------------------------2 It is easy to show that for p 2 p ...
... Siding Spring Observatory aerial view . 2.3 m telescope at Siding Spring Observatory . 2.3 m telescope at dusk . ... 2.3 m telescope at Siding Spring Observatory . 2.3 m telescope at dusk . Telescopes at Siding Spring Observatory . ...