Open Clusters Near and Far, Young and Old: M35 and NGC2158 (Wei-Hao Wang)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: HD251714 · HD251715 · HD251753 · HD251754 · HD251844 · HD251881 · HD251882 · HD251944 · HD251970 · HD252026 · HD252047 · HD252048 · HD252049 · HD252075 · HD252197 · HD252237 · HD252261 · HD252289 · HD252353 · HD252457 · HD252459 · HD252460 · HD252461 · HD252503 · HD252528 · HD252587 · HD41940 · M 35 · NGC 2158 · NGC 2168

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Open Clusters Near and Far, Young and Old: M35 and NGC2158

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Open Clusters Near and Far, Young and Old: M35 and NGC2158

This image serves as the first light for our new camera on our CDK20. It's meant to test the image quality, sensitivity, and linearity. To demonstrate these, I made an H-R diagram from the B and V images. In the HR diagram (Rev.B), you can see a thin and long sequence (small dot symbols). That's the main sequence of M35, a nearby open cluster. At the same time, you can see a second sequence (cross symbols), which is shorter and thicker. It's the main sequence of NGC2158, a distant open cluster. It's shorter because it's more evolved, as many of its massive stars have left the main sequence and evolved into giant stars (the sequence toward the upper right). It's thicker because photometric errors scatter the data points around and blur the sequence. The photometric errors for NGC2158 are much higher than those for M31 because the star density is very high. Many stars are blended with each other under our resolution (about 1.2 arcsec FWHM). This creates large photometric uncertainties.

The filters used here are Johnson-Cousins photometric filter. This kind of filters often have strong reflections and thus have halos around many stars. They don't look good at all. Unfortunately we have to live with such filters if we want to use the camera for research.

The shorter exposures were used for creating the H-R diagram, to provide photometry on stars saturated in the longer exposures. The short exposers were not used to create the 3-color picture.

Final
Original
B

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Status	Advanced success
Started	...
Astrometry.net job	7381399
PixInsight job	WELOFU1LDYOJSZFAPNMCSLV64W65QWK9
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h08m33s.634
RA (top/left)	06h10m08s.640
RA (top/right)	06h06m58s.237
RA (bottom/right)	06h06m59s.113
RA (bottom/left)	06h10m08s.701

Dec (center)	+24°17′02″.73
Dec (top/left)	+24°33′17″.79
Dec (top/right)	+24°33′09″.78
Dec (bottom/right)	+24°00′41″.79
Dec (bottom/left)	+24°00′48″.76

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Open Clusters Near and Far, Young and Old: M35 and NGC2158

Open Clusters Near and Far, Young and Old: M35 and NGC2158

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Open Clusters Near and Far, Young and Old: M35 and NGC2158

Open Clusters Near and Far, Young and Old: M35 and NGC2158

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