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| Paper: |
Spectroscopic Analysis of Hot Subdwarf Stars in the Globular Cluster NGC 6752 |
| Volume: |
481, 6th Meeting on Hot Subdwarf Stars and Related Objects |
| Page: |
59 |
| Authors: |
Chayer, P.; Dixon, W. |
| Abstract: |
We present a spectroscopic analysis of three hot subdwarf stars that are located in the globular cluster NGC 6752. The stars are B0852, B1754, and B2004. The analysis is based on observations obtained with the Far Ultraviolet Spectroscopic Explorer and the Cosmic Origins Spectrograph. The stars have effective temperatures ranging from 37,000 K to 40,000 K and gravities ranging from log g = 5.00 to 5.25. These parameters suggest that they are post-extreme horizontal branch stars. Our NLTE spectral synthesis analysis reveals that the abundances of C, O, Si, P, and S are subsolar by factors ranging from 10 to 1000. The abundances of N are slightly subsolar. The abundances of Fe and Ni observed in the star B1754 are subsolar and solar, respectively. The C, N, O, Si, P, S, and Fe abundances are consistent with the abundances observed in field sdB stars. |
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