Discovery of an M-type companion to the Herbig Ae Star V1787 Ori

被引：4
作者：
Arun, R. [1 ]
Mathew, Blesson [1 ]
Rengaswamy, Sridharan [2 ]
Manoj, P. [3 ]
Narang, Mayank [3 ]
Kartha, Sreeja S. [1 ]
Maheshwar, G. [2 ]
机构：
[1] CHRIST Deemed Be Univ, Dept Phys & Elect, Bangalore 560029, Karnataka, India
[2] Indian Inst Astrophys, Sarjapur Rd, Bangalore 560034, Karnataka, India
[3] Tata Inst Fundamental Res, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2021年 / 501卷 / 01期
基金：
欧盟地平线“2020”;
关键词：
binaries: visual; stars: pre-main-sequence; stars: variables: T Tauri; Herbig Ae/Be; T-TAURI STARS; VAST SURVEY; MASS STARS; MULTIPLICITY; EVOLUTION; BINARIES; CALIBRATION; CATALOG; SYSTEMS; DWARFS;
D O I：
10.1093/mnras/staa3652
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 arcsec (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 similar to 387 pc) and proper motion, indicating that they are physically associated. We estimate the spectral type of V1787 Ori B to be M5 +/- 2 from colour-spectral type calibration tables and template matching using SpeX spectral library. By fitting PARSEC models in the Pan-STARRS colour-magnitude diagram, we find that V1787 Ori B has an age of 8.1(-1.5)(+1.7) Myr and a mass of 0.39(-0.05)(+0.02) M-circle dot. 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.
引用
收藏
页码：1243 / 1252
页数：10
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