论文标题
发现Herbig AE星V1787 Ori的M型同伴
Discovery of an M-type Companion to the Herbig Ae Star V1787 Ori
论文作者
论文摘要
中间质量Herbig AE星V1787 ORI是Orion A分子云中L1641恒星形成区域的成员。我们从预计分离为6.66英寸（对应于2577 au）的M型伴侣对V1787 ORI的检测，从VLT/NACO适应性光学$ k_s $ band image。使用gaia dr2的astormetric数据，我们显示了v1787 ori a and $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d $ d在物理上，我们估计V1787 ORI B的光谱类型为M5 $ \ pm 2 $ \ pm 2，使用SPEX Spectral Spectral库中的颜色 - 光谱型校准表和模板匹配。 0.39 $^{+0.02} _ { - 0.05} $ $ M_ \ odot $，我们表明V1787 ORI是质量比为0.23的质量范围。 系统。
The intermediate mass Herbig Ae star V1787 Ori is a member of the L1641 star-forming region in the Orion A molecular cloud. We report the detection of an M-type companion to V1787 Ori at a projected separation of 6.66" (corresponding to 2577 au), from the analysis of VLT/NACO adaptive optics $K_s$-band image. Using astrometric data from Gaia DR2, we show that V1787 Ori A and B share similar distance ($d$ $\sim$ 387 pc) and proper motion, indicating that they are physically associated. We estimate the spectral type of V1787 Ori B to be M5 $\pm$ 2 from color--spectral type calibration tables and template matching using SpeX spectral library. By fitting PARSEC models in the Pan-STARRS color-magnitude diagram, we find that V1787 Ori B has an age of 8.1$^{+1.7}_{-1.5}$ Myr and a mass of 0.39$^{+0.02}_{-0.05}$ $M_\odot$. We show that V1787 Ori is a pre-main sequence wide binary system with a mass ratio of 0.23. Such a low mass ratio system is rarely identified in Herbig Ae/Be binary systems. We conclude this work with a discussion on possible mechanisms for the formation of V1787 Ori wide binary system.
