ICATE   21876
INSTITUTO DE CIENCIAS ASTRONOMICAS, DE LA TIERRA Y DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
On The Multiplicity of the Zero-Age Main-Sequence O Star Herschel 36
Autor/es:
ARIAS, J.I.; BARBÁ, R.H.; GAMEN, R.C.; MORRELL, N.I.; MAÍZ APELLÁNIZ, J.; ALFARO, E.J.; SOTA, A.; WALBORN, N.R.; MONI-BIDIN, C.
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Año: 2010 vol. 710 p. 30 - 34
ISSN:
0004-637X
Resumen:
We present the analysis of high-resolution optical spectroscopic observations of the zero-age main-sequence O star Herschel 36 spanning six years. This star is definitely a multiple system, with at least three components detected in its spectrum. Based on our radial-velocity (RV) study, we propose a picture of a close massive binary and a more distant companion, most probably in wide orbit about each other. The orbital solution for the binary, whose components we identify as O9 V and B0.5 V, is characterized by a period of 1.5415 ± 0.0006 days. With a spectral type O7.5 V, the third body is the most luminous component of the system and also presents RV variations with a period close to 498 days. Some possible hypotheses to explain the variability are briefly addressed and further observations are suggested.