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Title: A THIRD MASSIVE STAR COMPONENT IN THE {sigma} ORIONIS AB SYSTEM

Abstract

We report on the detection of a third massive star component in the {sigma} Orionis AB system, traditionally considered as a binary system. The system has been monitored by the IACOB Spectroscopic Survey of Northern Massive Stars program, obtaining 23 high-resolution FIES-NOT spectra with a time span of {approx}2.5 years. The analysis of the radial velocity curves of the two spectroscopic components observed in the spectra has allowed us to obtain the orbital parameters of the system, resulting in a high eccentric orbit (e {approx} 0.78) with an orbital period of 143.5 {+-} 0.5 days. This result implies the actual presence of three stars in the {sigma} Orionis AB system when combined with previous results obtained from the study of the astrometric orbit (with an estimated period of {approx}157 years).

Authors:
 [1];  [2];  [3]
  1. Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife (Spain)
  2. Centro de Astrobiologia (CSIC-INTA), P.O. Box 78, E-28691 Villanueva de la Canada, Madrid (Spain)
  3. Departamento de Fisica, Ingenieria de Sistemas y Teoria de la Senal, Universidad de Alicante, P.O. Box 99, E-03080 Alicante (Spain)
Publication Date:
OSTI Identifier:
21612628
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 742; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/742/1/55; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GALAXIES; ORBITS; RADIAL VELOCITY; STAR CLUSTERS; STARS; VELOCITY

Citation Formats

Simon-Diaz, S, Caballero, J A, and Lorenzo, J. A THIRD MASSIVE STAR COMPONENT IN THE {sigma} ORIONIS AB SYSTEM. United States: N. p., 2011. Web. doi:10.1088/0004-637X/742/1/55; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Simon-Diaz, S, Caballero, J A, & Lorenzo, J. A THIRD MASSIVE STAR COMPONENT IN THE {sigma} ORIONIS AB SYSTEM. United States. https://doi.org/10.1088/0004-637X/742/1/55; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)
Simon-Diaz, S, Caballero, J A, and Lorenzo, J. 2011. "A THIRD MASSIVE STAR COMPONENT IN THE {sigma} ORIONIS AB SYSTEM". United States. https://doi.org/10.1088/0004-637X/742/1/55; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21612628,
title = {A THIRD MASSIVE STAR COMPONENT IN THE {sigma} ORIONIS AB SYSTEM},
author = {Simon-Diaz, S and Caballero, J A and Lorenzo, J},
abstractNote = {We report on the detection of a third massive star component in the {sigma} Orionis AB system, traditionally considered as a binary system. The system has been monitored by the IACOB Spectroscopic Survey of Northern Massive Stars program, obtaining 23 high-resolution FIES-NOT spectra with a time span of {approx}2.5 years. The analysis of the radial velocity curves of the two spectroscopic components observed in the spectra has allowed us to obtain the orbital parameters of the system, resulting in a high eccentric orbit (e {approx} 0.78) with an orbital period of 143.5 {+-} 0.5 days. This result implies the actual presence of three stars in the {sigma} Orionis AB system when combined with previous results obtained from the study of the astrometric orbit (with an estimated period of {approx}157 years).},
doi = {10.1088/0004-637X/742/1/55; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
url = {https://www.osti.gov/biblio/21612628}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 742,
place = {United States},
year = {Sun Nov 20 00:00:00 EST 2011},
month = {Sun Nov 20 00:00:00 EST 2011}
}