Download e-book for iPad: Berkeley physics course, vol.4 - quantum physics by Eyvind H. Wichmann

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  • March 17, 2018
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By Eyvind H. Wichmann

ISBN-10: 0070667314

ISBN-13: 9780070667310

The direction is being built via an interuniversity staff, of which Charles Kittel is chairman.

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11. Here, / D is calculated relative to the interstellar concentration. We see that for the lowest values of the accretion rate, / D , declines quite rapidly for PMS Evolution 33 M * < 1 M 0 , even thoguh the star is fully convective, and therefore accreting deuterium as fast as it is being consumed. Actually, consumption slightly exceeds accretion, and L D differs correspondingly from the value in eq. (23). T h e evolution of / D in a fully convective protostar is given by M. dfp = Lp l-fD (28) M^ccS ' from which it follows t h a t djfpM,) M^cS (29) Since the product fY>M^ is proportional to the total deuterium content, equation (29) shows t h a t any net loss of deuterium implies t h a t L D exceeds Macc^.

Left panel: comparison of the low-temperature opacities for different densities. The solid lines are from Alexander et al. [1] and the dashed lines from Rogers & Iglesias [72]. Note that the latter do not include the contributions from molecules. Right panel: hightemperature opacities for a density of 10~^ g cm~^. Solid line is from Rogers & Iglesias [72] and the dashed line is from Cox & Tabor [28]. Note the enhancement of the opacity at T~10^ K (Z-bump). 085 M 0 , depending on metallicity), and in t h e brown dwarf regime.

At Ms, Lsurf climbs steeply to join Lrad (from Palla & Stahler [41]). Let us first apply Fig. 12 to t h e low mass T Tauri stars (M* < 2 M©). According to the figure, such stars begin contracting with Lsurf greater t h a n Lrad- In other words, they radiate more energy per unit time from their surfaces t h a n can be supplied by photons from the interior. T h e excess luminosity must be carried by thermal convection. Thus, T Tauri stars begin their evolution as fully convective objects with nearly fixed surface t e m p e r a t u r e s , in t h e same manner described by Hayashi.

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Berkeley physics course, vol.4 - quantum physics by Eyvind H. Wichmann


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