HD148937：银河系第三个成员的多波长研究？p class
HD148937: a multiwavelength study of the third Galactic member of the Of?p class
摘要：
三个银河系O型恒星属于罕见的类？p对象：HD 108、HD 191612和HD 148937。前两颗恒星表现出丰富的现象，包括磁场和强烈的X射线发射，光的变化，和戏剧性的周期性光谱变化。我们在这里提出的第一个详细的光学和X射线研究的第三银河系的？p星HD 148937光谱监测显示，在巴尔末和HeII 4686线的低水平的变化，但在HeI和CIII 4650恒定。Ha线的剖面变化周期约为7 d。模式大气拟合的产率T_{eff} =41000 ± 2000 K，log（g）=4.0 ± 0.1，Mdot_{sph} <~ 10^{-7}Msol/yr，氮过剩系数为4。在X射线波长下，HD 148937与HD 108和HD 191612相似，都有一个相对冷的热谱（kT=0.2keV），宽谱线（> 1700 km/s），以及一个与普通O星相比数量级的过光度（log [L_X^unabs/L_BOL] ~-6）。
英文摘要：
Three Galactic O-type stars belong to the rare class of Of?p objects: HD108, HD191612, and HD148937. The first two stars show a wealth of phenomena, including magnetic fields and strong X-ray emission, light variability, and dramatic periodic spectral variability. We present here the first detailed optical and X-ray study of the third Galactic Of?p star, HD148937. Spectroscopic monitoring has revealed low-level variability in the Balmer and HeII4686 lines, but constancy at HeI and CIII4650. The Ha line exhibits profile variations at a possible periodicity of ~7d. Model atmosphere fits yield T_{eff}=41000+-2000K, log(g)=4.0+-0.1, Mdot_{sph}<~ 10^{-7}Msol/yr and a surabondance of nitrogen by a factor of four. At X-ray wavelengths, HD148937 resembles HD108 and HD191612 in having a thermal spectrum dominated by a relatively cool component (kT=0.2keV), broad lines (>1700km/s), and an order-of-magnitude overluminosity compared to normal O stars (log [L_X^unabs/L_BOL] ~ -6).
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