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arXiv 1508.04780astro-ph.HEastro-ph.SR
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双子座双星毫秒双星的光学观测

Gemini optical observations of binary millisecond-pulsars

V. Testa, R. P. Mignani, C. Pallanca, A. Corongiu, F. R. Ferraro

摘要:

毫秒中子星(MSP)是一种快速旋转的中子星,其自转周期P_s <= 10 ms,很可能是在伴星吸积物质的过程中产生的。在这项工作中,我们提出的搜索结果的伴星的四个二进制毫秒双星,进行了档案数据从双子座南望远镜。基于与脉冲星无线电坐标非常好的位置重合,我们可能将伴星识别为三个MSP,即PSRJ 0614 -3329(g=21.95 +- 0.05),J1231-1411(g=25.40 +-0.23)和J2017+0603(g=24.72 +- 0.28)。对于最后一颗脉冲星(PSRJ 0613 -0200),由于在距离脉冲星射电坐标\sim 2”处存在一颗明亮的恒星(g=16 +- 0.03),识别受到了阻碍,我们只能将其伴星的星等设定为g=25.0、r= 24.3和i= 24.2的3-sigma上限。PSRJ 0614 -3329、J1231-1411和J2017+0603的候选伴星根据它们的光学颜色和亮度以及与恒星模型轨迹的比较,可以被初步确定为He白矮星(WD)。从我们的多波段测光与恒星模型轨道的比较中,我们还获得了这三个MSP的候选WD同伴的质量,温度和重力的可能范围。需要光谱观测来确认它们可能被归类为He WDs,并精确测量它们的恒星参数。

英文摘要:

Milli-second pulsars (MSPs) are rapidly spinning neutron stars, with spin periods P_s <= 10 ms, which have been most likely spun up after a phase of matter accretion from a companion star. In this work we present the results of the search for the companion stars of four binary milli-second pulsars, carried out with archival data from the Gemini South telescope. Based upon a very good positional coincidence with the pulsar radio coordinates, we likely identified the companion stars to three MSPs, namely PSRJ0614-3329 (g=21.95 +- 0.05), J1231-1411 (g=25.40 +-0.23), and J2017+0603 (g=24.72 +- 0.28). For the last pulsar (PSRJ0613-0200) the identification was hampered by the presence of a bright star (g=16 +- 0.03) at \sim 2" from the pulsar radio coordinates and we could only set 3-sigma upper limits of g=25.0, r= 24.3, and i= 24.2 on the magnitudes of its companion star. The candidate companion stars to PSRJ0614-3329, J1231-1411, and J2017+0603 can be tentatively identified as He white dwarfs (WDs) on the basis of their optical colours and brightness and the comparison with stellar model tracks. From the comparison of our multi-band photometry with stellar model tracks we also obtained possible ranges on the mass, temperature, and gravity of the candidate WD companions to these three MSPs. Optical spectroscopy observations are needed to confirm their possible classification as He WDs and accurately measure their stellar parameters.

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