用NACO探测微弧秒天体测量
Probing micro-arcsec astrometry with NACO
摘要：
相对天体测量的精度远优于1 mas（毫角秒）通常被认为是干涉测量的领域。Pravdo & Shaklan（1996）在光学领域的开创性工作，在直接成像中达到了150微弧秒的精度，但最终受到大气湍流和差分色折射（DCR）效应的限制。Neuhaeuser等人（2006年，2007年）证明，在近红外窄带滤光片中使用NACO进行AO辅助观测，可以在1小时内对0.6角秒的双星进行约50 μ as（微arsec）的测量，并且不受DCR效应的影响。这为太阳系外行星的天体测量探测和确定其真实质量开辟了新的可能性。我们在这里讨论如何改进测量和解决必要的校准。
英文摘要：
Relative astrometric measurements with a precision far better than 1 mas (milli-arcsec) are commonly regarded as the domain of interferometry. Pioneering work by Pravdo & Shaklan (1996), made in the optical, reached a precision of 150 micro-arcsec in direct imaging but is ultimately limited by atmospheric turbulence and differential chromatic refraction (DCR) effects. Neuhaeuser et al. (2006, 2007) demonstrated that AO assisted observations with NACO in a near-infrared narrow band filter allow measurements with a precision of ~50 muas (micro-arsec) on a 0.6 arcsec binary within one hour and are unaffected by DCR effects. This opens new possibilities for astrometric detections of extrasolar planets and the determination of their true masses. We discuss here how to improve the measurements and address the necessary calibrations.
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