1) A star has (B-V)OBSERVED = 1.8 and (B-V)INTRINSIC = 0.6. (a) What is the color excess of this star? (b) What is the t

[answerhappygod]

1) A star has (B-V)OBSERVED = 1.8 and (B-V)INTRINSIC = 0.6.
(a) What is the color excess of this star?
(b) What is the total reddening (A) for the star in 1)?
(c) The same star has an apparent magnitude of m = 13.0 and
an absolute magnitude of M = 5. Given its total reddening from
question 2), what is this object’s distance (d)?

(d) Based on the values you have already calculated for A and
d, what is the extinction coefficient (k) for this system?
(e) The average size of some particles in the observed ISM
region is σ = 3 x 10-6 cm3. Are these
particles more likely to be gas atoms or dust grains?