ON THE MULTIPLICITY OF THE ZERO-AGE MAIN-SEQUENCE O STAR HERSCHEL 36
- Departamento de Fisica, Universidad de La Serena, Benavente 980, La Serena (Chile)
- Instituto de Astrofisica de La Plata, CONICET, Facultad de Cs Astronomicas y GeofIsicas, Universidad Nac. de La Plata, Paseo del Bosque S/N, La Plata (Argentina)
- Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena (Chile)
- Instituto de Astrofisica de AndalucIa-CSIC, Glorieta de la Astronomia s/n, Granada 18008 (Spain)
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218 (United States)
- Departamento de Astronomia, Universidad de Concepcion, Casilla 160-C, Concepcion (Chile)
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.
- OSTI ID:
- 21301313
- Journal Information:
- Astrophysical Journal Letters, Vol. 710, Issue 1; Other Information: DOI: 10.1088/2041-8205/710/1/L30; Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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