ay45c5-page9 - Physical Properties of Main-Sequence Stars...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Physical Properties of Main-Sequence Stars log(M=M ) Spectral log(L=L ) class 1:0 M6 2:9 0:8 M5 2:5 0:6 M4 2:0 0:4 M2 1:5 0:2 K5 0:8 0.0 G2 0.0 0.2 F0 0.8 0.4 A2 1.6 0.6 B8 2.3 0.8 B5 3.0 1.0 B3 3.7 1.2 B0 4.4 1.4 O8 4.9 1.6 O5 5.4 1.8 O4 6.0 Mbol 12.1 10.9 9.7 8.4 6.6 4.7 2.7 0.7 1:1 2:9 4:6 6:3 7:6 8:9 10:2 MV 15.5 13.9 12.2 10.2 7.5 4.8 2.7 1.1 0:2 1:1 2:2 3:4 4:6 5:6 6:3 log(R=R ) 0:9 0:7 0:5 0:3 0:14 0.00 0.10 0.32 0.49 0.58 0.72 0.86 1.00 1.15 1:3 Here is the comparison with our twiddle model: log (R/R ) our 1 "actual data" 0.5 −1 −0.5 n ctio di pre 0.5 1 1.5 log (M/M ) −0.5 Mass-Radius Relation for Stars What about the luminosity of stars? Can we predict that with twiddle calculations? Yes, but we need to know something about the opacity of stellar material, that is, how much resistance it gives to the outward di usion of 121 ...
View Full Document

Ask a homework question - tutors are online