For module 8 I used data for M16. I selected stars which did not have neighbors so the circles would not overlap other stars and affect the measurements. I had to make individual adjustments to the aperture for each star. The data was entered onto a worksheet and a graph made. The data fell on a line. I do not know enough about stars to explain such a result. The b/v values varied from 0.321 to 0.67.
I used M17. I used magnifier to zoom 150%. I used 5 different stars which are observed in both B and V filters. I used stars which did not have stars close to them. I recorded X, Y and source-sky values for both B and V filters for each star. Then by dividing source sky of B filter to V filter I calculated B/V ratio. The range for B/v ratio was 0.33-0.44. Hotter stars will have less difference in B-V filters. Therefore B/V ratio will be higher for hotter stars. 0.44 will be the hottest and the rest will be cooler than that. After calculating B/V ratio, I checked the brightness of stars on both filters. I saw that one of the stars which is not seen as bright as others were hotter than some of the brighter stars.
For module 8 I used data for M16. I selected stars which did not have neighbors so the circles would not overlap other stars and affect the measurements. I had to make individual adjustments to the aperture for each star. The data was entered onto a worksheet and a graph made. The data fell on a line. I do not know enough about stars to explain such a result.
ReplyDeleteThe b/v values varied from 0.321 to 0.67.
I used M17. I used magnifier to zoom 150%.
ReplyDeleteI used 5 different stars which are observed in both B and V filters. I used stars which did not have stars close to them. I recorded X, Y and source-sky values for both B and V filters for each star. Then by dividing source sky of B filter to V filter I calculated B/V ratio. The range for B/v ratio was 0.33-0.44.
Hotter stars will have less difference in B-V filters. Therefore B/V ratio will be higher for hotter stars. 0.44 will be the hottest and the rest will be cooler than that.
After calculating B/V ratio, I checked the brightness of stars on both filters. I saw that one of the stars which is not seen as bright as others were hotter than some of the brighter stars.
I am a little confused, M16 and M17 are nebulae not open clusters. Isn't module 8 about distance to stars in open clusters?
ReplyDelete