INVESTIGADORES
GAMEN Roberto Claudio
artículos
Título:
Spectroscopic study of the extremely young O-type triple system Herschel 36 A in the Hourglass nebula – I. Orbital properties
Autor/es:
CAMPILLAY, ABDO R; ARIAS, JULIA I; BARBÁ, RODOLFO H; MORRELL, NIDIA I; GAMEN, ROBERTO C; MAÍZ APELLÁNIZ, JESÚS
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2019 vol. 484 p. 2137 - 2147
ISSN:
0035-8711
Resumen:
We present a detailed spectroscopic study of Herschel 36 A (H36A), themain stellar component of the massive multiple system Herschel 36 in theHourglass nebula, based on high-resolution optical spectra obtainedalong an 11 yr span. The three stellar components present in thespectrum of H36A are separated by means of a spectral disentanglingtechnique. Individual spectral classifications are improved, andhigh-precision orbital solutions for the inner and outer orbits arecalculated. H36A is confirmed to be a hierarchical triple systemcomposed of a close massive binary (Ab1 + Ab2, O9.5 V + B0.7 V) in wideorbit around a third O-type star (Aa, O7.5 Vz). The inner-pair orbit ischaracterized by a period of 1.54157 ± 0.00006 d, andsemi-amplitudes of 181.2 ± 0.7 and 295.4 ± 1.7 kms-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 kms-1. The inner and outer orbits are not coplanar, having arelative inclination of at least 20°. Dynamical minimum masses of20.6 ± 0.8 Modot, 18.7 ± 1.1Modot, and 11.5 ± 1.1 Modot are derivedfor the Aa, Ab1, and Ab2 components, respectively, in reasonableagreement with the theoretical calibrations.
