Manifestation of the light-induced drift effect in chemically peculiar stellar atmospheres |
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| Authors: | A I Parkhomenko A M Shalagin |
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| Institution: | 1. Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
2. Novosibirsk State University, Novosibirsk, 630090, Russia
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| Abstract: | We have calculated the factor (ν g ? ν e )/ν g in the temperature range T = 300–20 000 K for the ions Be+, Mg+, Ca+, C+ in atomic hydrogen and for the ions Mg+ in atomic argon using the known interaction potentials. Here ν e and ν g are the transport collision frequencies for excited- and ground-state particles respectively. Calculations have shown that at T = 10 000–20 000 K, typical temperatures of the atmospheres of chemically peculiar (CP) stars, the values |ν g ? ν e |/ν g ≈ 0.1–0.2 can be reached for ions. This causes the light-induced drift (LID) velocity of ions up to ～0.1 cm/s in the atmospheres of CP stars with temperatures T < 10 000 K. Therefore the separation of chemical elements due to the LID of ions under the conditions of the atmospheres of such CP stars can be an order of magnitude more efficient in comparison with the separation caused by the radiation pressure. In the atmosphere of more hot stars (20 000 K > T > 10 000 K) it is possible to expect approximately identical magnitude of the LID effect and that of radiation pressure. In the very hot stars (T >20 000 K) the LID effect is manifested very weakly. |
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