标题： 赫歇尔望远镜对大麦哲伦云中新发现的UX奥里星的观测 显示英文标题

标题： Herschel Observations of a Newly Discovered UX Ori Star in the Large Magellanic Cloud

摘要： LMC 恒星，SSTISAGE1C J050756.44-703453.9，在对EROS-2光变曲线的调查中首次被注意到，该调查针对的是具有典型R Corona Borealis（RCB）类恒星不规则亮度变化大的恒星。 然而，显示发射线（包括巴尔末系和帕申系以及许多Fe II线）的可见光谱绝不是RCB型恒星的光谱。 这颗恒星具有典型的UX Ori型恒星的所有特征。 它的光谱类型约为A2，并在其附近激发了一个H II区。 然而，如果它是LMC成员，那么对于Herbig Ae/Be星来说，它非常亮。 它的亮度会不规则地下降多达2个星等，并且表现出这种恒星类别的典型消光和“蓝化”现象。 其光谱显示出发射线和吸收线的组合，这是由于来自周围星际尘埃的遮挡导致的衰减所引起的UX Ori型恒星衰退的典型特征。 SSTISAGE1C J050756.44-703453.9 具有强烈的红外过量，在500微米范围内存在显著的发射。 对其SED的蒙特卡洛辐射传递建模表明，SSTISAGE1C J050756.44-703453.9 必须同时具有尘埃盘和一个大的扩展弥散包层，以拟合中远红外尘埃发射。 这颗恒星是Herbig Ae/Be星UX Ori子类中的新成员，也是在LMC中发现的第二个此类恒星。 显示英文摘要

摘要： The LMC star, SSTISAGE1C J050756.44-703453.9, was first noticed during a survey of EROS-2 lightcurves for stars with large irregular brightness variations typical of the R Coronae Borealis (RCB) class. However, the visible spectrum showing emission lines including the Balmer and Paschen series as well as many Fe II lines is emphatically not that of an RCB star. This star has all of the characteristics of a typical UX Ori star. It has a spectral type of approximately A2 and has excited an H II region in its vicinity. However, if it is an LMC member, then it is very luminous for a Herbig Ae/Be star. It shows irregular drops in brightness of up to 2 mag, and displays the reddening and "blueing" typical of this class of stars. Its spectrum, showing a combination of emission and absorption lines, is typical of a UX Ori star that is in a decline caused by obscuration from the circumstellar dust. SSTISAGE1C J050756.44-703453.9 has a strong IR excess and significant emission is present out to 500 micron. Monte Carlo radiative transfer modeling of the SED requires that SSTISAGE1C J050756.44-703453.9 has both a dusty disk as well as a large extended diffuse envelope to fit both the mid- and far-IR dust emission. This star is a new member of the UX Ori subclass of the Herbig Ae/Be stars and only the second such star to be discovered in the LMC.