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| Paper: |
Parallax calibration of the population II main sequence |
| Volume: |
4, The Extragalactic Distance Scale: Proceedings of the ASP 100th Anniversary Symposium |
| Page: |
170 |
| Authors: |
Lutz, Thomas E.; Hanson, Robert B.; van Altena, William F. |
| Abstract: |
The trigonometric parallax calibration of the field subdwarf main sequence is of vital importance for determining the distance moduli of globular clusters. A multivariate analysis has been performed to assess the dependence of Mv on (B-V) and (Fe/H), using 50 stars having both (1) very accurate trigonometric parallaxes and (2) spectroscopic (Fe/H) determinations. Possible effects on the calibration due to stellar surface gravity and age are discussed. The Lutz-Kelker Delta M corrections are very small for these stars. |
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