期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 710, 期 1, 页码 L30-L34出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/710/1/L30
关键词
binaries: close; stars: early-type; stars: individual (Herschel 36)
资金
- DIULS [P1071 01, CD08102]
- Fondo ALMA para el Desarrollo de la Astronomia CONICYT [31050004]
- Spanish Government MICINN [AYA2007-64052]
- Consejeria de Educacion y Ciencia (Junta de Andalucfa) [TIC-101, TIC-4075]
- Ramon y Cajal Fellowship program and FEDER
- Chilean Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA)
- La Silla Observatory [077.B-0348, 079.D0564, 079.D-0564, 081.D-2008, 083.D-0589]
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.
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