The white dwarf revealed in the intermediate polar V709 Cassiopeiae
The white dwarf revealed in the intermediate polar V709 Cassiopeiae
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中极地 V709 仙后座中发现的白矮星
DOI：
10.1051/0004-6361:20010756
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发表时间：
2001
影响因子：
6.5
通讯作者：
O. Strasbourg
中科院分区：
文献类型：
--
作者：
J. Bonnet;M. Mouchet;D. Martino;G. Matt;C. d'Astrophysique;Saclay;France.;Daec;O. Paris;Osservatorio Astronomico di Napoli;Italy.;Universita' di Roma;O. Strasbourg
结果来自最近鉴定的中间极性RXJ0028.8+5917/V709 Cas的第一次详细的光谱观察。通过对发射线径向速度的研究，消除了轨道周期不同混叠的不确定性，发现最佳值为（0.2225±0.0002）天。研究还发现，该体系对Balmer谱线Hδ ~ Hβ具有明显的EW ′（2-4）u宽吸收.这些广泛的反射被解释为底层白色矮星大气的贡献。在23000 K的温度下，发现这些吸收的特征与DA log g =8白色矮星一致，对总通量的贡献为17%（在4500 u处）。这是第一次在中间极地系统中直接探测到白色矮星。没有显著的塞曼分裂表明磁场低于10 MG，证实至少在某些情况下，中间极具有比极弱的磁场。不同的可能性进行了讨论，以解释白色矮星的整体流量的实质性贡献。
Results are presented from the first detailed spectroscopic observations of the recently identified inter- mediate polar RXJ0028.8+5917/V709 Cas. The study of the emission line radial velocities allows us to remove the uncertainties on the different aliases of the orbital period and a best value is found at (0.2225±0.0002) day. It is also found that the system shows significant EW� (2-4)u broad absorptions affecting the Balmer lines from Hδ to Hβ. These broad absorptions are interpreted as the contribution of an underlying white dwarf atmosphere. The characteristics of the absorptions are found to be consistent with a DA log g =8 white dwarf at a temperature of �23000K, contributing �17% (at 4500u to the overall flux. This is the first direct detection of a white dwarf in an intermediate polar system. The absence of significant Zeeman splitting indicates a magnetic field lower than 10 MG, confirming that, at least in some cases, intermediate polars have weaker fields than polars. Different possibilities are discussed to explain the substantial contribution of the white dwarf to the overall flux.