| タイトル | A lower limit on the magnitude of the companion to HDE 226868 /Cygnus X-1/ |
| 著者（英） | Margon, B.; Katz, J. I.; Harms, R. J.; Shafter, A. W. |
| 著者所属（英） | California Univ.|California Univ. |
| 発行日 | 1980-09-01 |
| 言語 | eng |
| 内容記述 | High-precision digital spectra of the HDE 226868/Cygnus X-1 system have been obtained at a variety of orbital phases, using a Digicon photon counting array at the coude focus of the Lick Shane reflector. The spectra have been cross-correlated to search for evidence for the existence of a luminous stellar companion to HDE 226868, as has been suggested by several models where the secondary star is not a black hole. We find no evidence for such a star and place a lower limit on the difference between HDE 226868 and its companion of 4 magnitudes. This limit rules out all of the models for the Cygnus X-1 system calculated by Avni and Bahcall which include main-sequence stars as secondaries rather than black holes. A merit function generally useful for cross-correlation of digital spectra is described. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 81A12824 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/418924 |
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