| 11. | People usually use optical depth to characterize the relative ratio between measurement strength and the optical decay.
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| 12. | By measuring optical depth in SiII and CII we will estimate the covering fraction of neutral gas.
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| 13. | "' Optical depth "'in astrophysics refers to a specific level of transparency.
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| 14. | At optical depth 0.67 the radius would be, indicating an extended optically thick stellar wind.
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| 15. | In contrast, the dust bands have relatively few large particles, which results in low optical depth.
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| 16. | In the case of the WR primary star, the optical depth temperature is 96, 000 K.
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| 17. | From the definition, it is also clear that large optical depths correspond to higher rate of obscuration.
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| 18. | With an optical depth of about 0.06, it is markedly more diffuse than its companion.
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| 19. | In the case of the WR primary star, the optical depth temperature is 115, 000 K.
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| 20. | Starlight traveling through a kiloparsec column undergoes about a magnitude of extinction, so that the optical depth ~ 1.
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