HST/FGS CVn型恒星的视差和天体物理结果
HST/FGS Parallaxes of AM CVn Stars and Astrophysical Consequences
摘要：
我们提出了绝对的auslaxes和相对自行的5 AM CVn星，我们得到了使用的精细制导传感器上的哈勃太空望远镜。我们的视差测量结果转化为距离d（AM CVn）=606+135-93 pc，d（HP Lib）=197+14-12 pc，d（CR Boo）=337+44-35 pc，d（V803 Cen）=347+32-27 pc，d（GP Com）=75+2-2 pc。从这些距离，我们估计的空间密度的AM CVn星，并建议以前的估计已经过高了约一个数量级。我们还推断的质量吸积率，使我们能够约束的捐助者恒星的质量，我们表明，相对大规模的，半简并的捐助者恒星的青睐，在所有系统中，除了GP Com。最后，我们根据它们的距离和二进制组件的推断质量，对它们的引力波信号进行了更新估计，这与未来的太空任务有关，例如拟议的激光干涉仪空间天线（LISA）。我们表明，所有的系统，但GP Com是很好的候选人与LISA检测。
英文摘要：
We present absolute parallaxes and relative proper motions for five AM CVn stars, which we obtained using the Fine Guidance Sensors on board the Hubble Space Telescope. Our parallax measurements translate into distances d(AM CVn)=606+135-93 pc, d(HP Lib)=197+14-12 pc, d(CR Boo)=337+44-35 pc, d(V803 Cen)=347+32-27 pc, and d(GP Com)=75+2-2 pc. From these distances we estimate the space density of AM CVn stars and suggest that previous estimates have been too high by about an order of magnitude. We also infer the mass accretion rates which allows us to constrain the masses of the donor stars, and we show that relatively massive, semi-degenerate donor stars are favored in all systems except GP Com. Finally, we give updated estimates for their gravitational-wave signals, relevant for future space missions such as the proposed Laser Interferometer Space Antenna (LISA), based on their distances and the inferred masses of the binary components. We show that all systems but GP Com are excellent candidates for detection with LISA.
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