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Originally Posted by timb
That doesn't seem 100% right. Isn't the Sun an intermediate mass star? it appears to have had some mechanism for losing its angular momentum. The Sun has a convective zone, but it is not classed as "fully convective". Maybe Baily & Reipurth are referring to stars a little more massive than the Sun. Stars earlier than F7 tend to be rapid rotators. I think F6 corresponds to about 1.2 Msun, but that's just a guess.
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They are refering to a mass range of 2M
sun to 5M
sun, (typically, B and A class and they mention the Herbig AeBe stars).
Thanks.
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Did you account for the fact Fomalhaut's area is about 3.4 times solar? I think Fomalhaut's bolometric luminosity is about 17 times solar.
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Darn, I knew I should have slept in this morning.
Ok, at 25 lyrs, a visual mag. of 1.16 matches to a 9,075K blackbody with a 1.83 Solar radius star. Both show Fomalhaut to be 17.9 times brighter than the white hot Sun.
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So it could be imaged in reflected light (as opposed to in its own IR emissions), if they were willing to point HST at it for long enough. I've read that the albedo of gas giants varies greatly with their temperature though.
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Guess what!
Fomalhaut b is the very first one found in visible light.
[I still think we need to party about this huge milestone accomplishment.] I was just curious to see if I could determine its apparent magnitude since I had not seen it stated in the few articles I've read.