Spectroscopic study of the extremely young O-type triple system Herschel 36 A in the Hourglass nebula - I. Orbital properties

被引：11

作者：

Campillay, Abdo R. ^{[1
]}

Arias, Julia I. ^{[1
]}

Barba, Rodolfo H. ^{[1
]}

Morrell, Nidia I. ^{[2
]}

Gamen, Roberto C. ^{[3
,4
]}

Maiz Apellaniz, Jesus ^{[5
]}

机构：

[1] Univ La Serena, Dept Fis & Astron, Av Juan Cisternas 1200 Norte, La Serena, Chile

[2] Carnegie Observ, Las Campanas Observ, Casilla 601, La Serena, Chile

[3] UNLP, CONICET, Inst Astrofis La Plata, Paseo Bosque S-N, La Plata, Buenos Aires, Argentina

[4] UNLP, Fac Ciencias Astron & Geofis, Paseo Bosque S-N, La Plata, Buenos Aires, Argentina

[5] CSIC INTA, Ctr Astrobiol, Campus ESAC Camino Bajo Castillo S-N, E-28692 Villanueva De La Canada, Spain

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 484卷 / 02期

关键词：

binaries: close; binaries: spectroscopic; stars: individual: Herschel 36; stars: massive; GALACTIC O; OPTICAL SPECTROSCOPY; CARINA-NEBULA; MASSIVE STARS; CLUSTER; BINARIES; CALIBRATION; TARGETS; REGION;

D O I：

10.1093/mnras/stz005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a detailed spectroscopic study of Herschel 36 A (H36A), the main stellar component of the massive multiple system Herschel 36 in the Hourglass nebula, based on high-resolution optical spectra obtained along an 11 yr span. The three stellar components present in the spectrum of H36A are separated by means of a spectral disentangling technique. Individual spectral classifications are improved, and high-precision orbital solutions for the inner and outer orbits are calculated. H36A is confirmed to be a hierarchical triple system composed of a close massive binary (Ab1 + Ab2, O9.5 V + B0.7 V) in wide orbit around a third O-type star (Aa, 07.5 Vz). The inner-pair orbit is characterized by a period of 1.54157 +/- 0.00006 d, and semi-amplitudes of 181.2 +/- 0.7 and 295.4 +/- 1.7 km s(-1). The outer orbit has a period of 492.81 +/- 0.69 d, and semi-amplitudes of 62.0 +/- 0.6 and 42.4 +/- 0.8 km s(-1). The inner and outer orbits are not coplanar, having a relative inclination of at least 20 degrees. Dynamical minimum masses of 20.6 +/- 0.8 M-circle dot, 18.7 +/- 1.1 M-circle dot, and 11.5 +/- 1.1 M(circle dot )are derived for the Aa, Ab1, and Ab2 components, respectively, in reasonable agreement with the theoretical calibrations.

引用

页码：2137 / 2147

页数：11

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