THE PROGENITOR MASS OF THE MAGNETAR SGR1900+14
THE PROGENITOR MASS OF THE MAGNETAR SGR1900+14
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DOI：
10.1088/0004-637x/707/1/844
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
B. Davies;D. Figer;R. Kudritzki;C. Trombley;C. Kouveliotou;S. Wachter
中科院分区：
文献类型：
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作者：
B. Davies;D. Figer;R. Kudritzki;C. Trombley;C. Kouveliotou;S. Wachter
磁星是具有极端磁场的年轻中子星（B > 1014-1015 G）。这些磁场与它们的祖先恒星的特性有什么关系，目前还不清楚。然而，从与年轻星团相关的少数天体中，已经有可能估计出祖星的初始质量，结果表明，一个非常大质量的祖星（Mprog> 40 M）需要产生一个磁星。在这里，我们展示了自适应光学辅助的Keck/NIRC2成像和Keck/NIRSPEC光谱，并报告了与磁星SGR 1900+14相关的星团，磁星的初始祖星质量比这个极限低2倍，Mprog = 17±2m。我们的结果对磁星只能由非常大质量的祖星产生的概念提出了强烈的挑战。相反，我们倾向于一种机制，这种机制不仅仅依赖于产生这些极端磁场的初始恒星质量，例如“化石场”模型或涉及密切双星演化的过程。
Magnetars are young neutron stars with extreme magnetic fields (B ≳ 1014–1015 G). How these fields relate to the properties of their progenitor stars is not yet clearly established. However, from the few objects associated with young clusters it has been possible to estimate the initial masses of the progenitors, with results indicating that a very massive progenitor star (Mprog> 40 M) is required to produce a magnetar. Here, we present adaptive-optics assisted Keck/NIRC2 imaging and Keck/NIRSPEC spectroscopy of the cluster associated with the magnetar SGR 1900+14, and report that the initial progenitor star mass of the magnetar was a factor of 2 lower than this limit, Mprog = 17 ± 2 M. Our result presents a strong challenge to the concept that magnetars can only result from very massive progenitors. Instead, we favor a mechanism which is dependent on more than just initial stellar mass for the production of these extreme magnetic fields, such as the “fossil-field” model or a process involving close binary evolution.