httpi67tinypiccom11kghmspng The best fit estimate for the ex

http://i67.tinypic.com/11kghms.png

The best fit estimate for the extinction in the direction of IRAS 03255+3103 is A_v=14. What is the Perseus molecular cloud dust column density, in the direction of this source? Hint: assume an average dust grain size a=0.2 micrometers and an average extinction coefficient Q_v=1.5.

Estimate the temperature of the dust in the infalling envelope. Hint: in Wien\'s displacement law the peak of emission refers to F_lambda, not F_nu.

Estimate the luminosity (in units of solar luminosity) and the radius (in AU) of IRAS 03255+3103. Hint: integrate numerically F_lambda over d,lambda (you can use the trapezoidal rule) to estimate the total flux F of the source. Since the emission is in the far infrared, you can ignore extinction.

Estimate the minimum average density and the minimum mass for the IRAS 03255+3103 core to collapse, assuming that its radius is just equal to the Jean\'s radius. Hint: assume a composition of the collapsiing envelope of 70% H2 and 30% He (with all the H in molecular form).

Solution

Check this link :

adsabs.harvard.edu/full/1995A%26A...300..493L