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NGC 6738: Not a real open cluster
A photometric, astrometric and spectroscopic investigation of the poorlystudied open cluster NGC 6738 has been performed in order to ascertainits real nature. NGC 6738 is definitely not a physical stellar ensemble:photometry does not show a defined mean sequence, proper motions andradial velocities are randomly distributed, spectro-photometricparallaxes range between 10 and 1600 pc, and the apparent luminosityfunction is identical to that of the surrounding field. NGC 6738therefore appears to be an apparent concentration of a few bright starsprojected on patchy background absorption.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Kartal |
| Sað Açýklýk: | 19h01m47.94s |
| Yükselim: | +11°27'18.8" |
| Görünürdeki Parlaklýk: | 7.749 |
| özdevim Sað Açýklýk: | -0.6 |
| özdevim Yükselim: | -6.6 |
| B-T magnitude: | 9.11 |
| V-T magnitude: | 7.862 |
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