| タイトル | PG 0308 + 096 and PG 1026 + 002 - Two new short period binary stars resulting from common-envelope evolution |
| 著者（英） | Bechtold, J.; Foss, Diana; Kidder, K.; Saffer, Rex A.; Wade, Richard A.; Sion, Edward M.; Green, Richard F.; Liebert, James |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1993-05-01 |
| 言語 | eng |
| 内容記述 | Ultraviolet spectroscopy, optical spectroscopy, and spectrophotometry have been used to study the excess UV stars PG 0308 + 096 and PG 1026 + 002. Both objects are short-period binary systems, each containing a DA white dwarf star and a dM star. Orbital periods of approximately 0.284 day for PG 0308 + 096, and aproximately 0.597 day for PG 1026, have been found by spectroscopic analysis of the H-alpha emission line. Ly-alpha and Balmer line profile fitting were used to estimate the mass of white dwarf stars; mass estimates for the dM stars are based on their spectral types. The orbital inclinations are derived from these masses, the periods, and amplitudes of the H-alpha radial velocity curves. The equivalent width of the H-alpha emission line, in each binary system, varies with the orbital phase in such a manner as to imply that it arises, in large part at least, from the hemisphere of the M star that faces the white dwarf star. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 93A35128 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/318099 |
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