# Age of stellar cluster Essay

This essay has a total of 517 words and 4 pages.

age of stellar cluster

Purpose: to become familiar with the image analysis program and to develop an
understanding to the size and age of planetary nebulae

Procedure

The first part of the experiment involved using a picture of a church and back round to
understand different pixels, ADU, zoom, and how to get the (x,y) coordinates. We then took
this brief understanding of pictures and applied it to the stars. We loaded a picture of
nebulae m42. After this we needed to calculate the average number of stars or solar
masses. We found the (x,y) coordinates of a position in the center of the nebulae and on
the edge of the nebulae. We used the following distance formula to find the distance
between the points.

After this calculation the answer in pixels needed to be converted to arc seconds for use
in the small angle formula where 1 pixel approx. = 3 arc seconds. We now could use the
small angle formula to find the actual radius in pc. Where d is the radius D is the
distance from the Earth in pc and theta is the value we had just found out in arc seconds.

After the calculation we needed to convert pc to meters so we used the calculation factor of 1pc=3*10^16m

Now we needed to find the density. Density was figured out by multiplying the majority
substance in the nebulae (hydrogen) per cubic m^3 by the mass of hydrogen in kg, which
gave us the formula

We then had the info we needed to find the mass of the nebulae. We calculated this by
using a spherical shape for ease of calculation. We used the following formula where m is
the mass p is the density and r is the radius found above from the small angle formula
(d).

Now that we had the amount of mass we needed to find the solar masses so we divided the
mass of the nebulae by one solar mass unity in the following equation.

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