[Space] the problem with Sol - Page 2

Agemegos · 01-22-2007, 10:46 PM

G'day

Sol's mass is by definition 1.0, and it's age is currently believed to be 4.8 billion years. It is categorised as G2 V, and its radius is 696 000 km. Let's work through its stellar characteristics using Step 18 of the Star System Generation sequence on pp. 102–105.

Mass = 1.0 implies M-span = 10. Age < M-span so the star is main-sequence.

From the table on p 103, MIN = 0.68, MAX = 1.60, S = 10, M = 5,800

L = MIN + [(A/S) * (MAX - MIN)]

= 0.68 + [(4.8/10) * (1.6 - 0.68)]

= 0.68 + 0.48*0.92

= 1.1216

R = (155,000 * sqrt(L))/T^2, where T = M for a main-sequence star

= 0.00488 AU

= 730 006 km

Close enough, do you think?

Regards,

Brett

01-22-2007, 10:46 PM	#1
Agemegos Join Date: May 2005 Location: Oz	[Space] the problem with Sol G'day Sol's mass is by definition 1.0, and it's age is currently believed to be 4.8 billion years. It is categorised as G2 V, and its radius is 696 000 km. Let's work through its stellar characteristics using Step 18 of the Star System Generation sequence on pp. 102–105. Mass = 1.0 implies M-span = 10. Age < M-span so the star is main-sequence. From the table on p 103, MIN = 0.68, MAX = 1.60, S = 10, M = 5,800 L = MIN + [(A/S) * (MAX - MIN)] = 0.68 + [(4.8/10) * (1.6 - 0.68)] = 0.68 + 0.480.92 = 1.1216 R = (155,000 sqrt(L))/T^2, where T = M for a main-sequence star = 0.00488 AU = 730 006 km Close enough, do you think? Regards, Brett __________________ Decay is inherent in all composite things. Nod head. Get treat.