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Title: Lucky Spectroscopy, an equivalent technique to Lucky Imaging. Spatially resolved spectroscopy of massive close visual binaries using the William Herschel Telescope
Authors: Maíz Apellániz, J.; Barbá, R. H.; Simón-Díaz, S.; Sota, A.; Trigueros Páez, E.; Caballero, J. A.; Alfaro, E. J.
Affiliation: Maíz Apellániz, J.: Centro de Astrobiología, CSIC-INTA, Campus ESAC, Camino bajo del castillo s/n, 28692 Vill. de la Cañada, Madrid, Spain
Barbá, R. H.: Departamento de Física y Astronomía, Universidad de La Serena, Av. Cisternas, 1200, Norte La Serena, Chile
Simón-Díaz, S.: Instituto de Astrofísica de Canarias, 38 200, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38 205, La Laguna, Tenerife, Spain
Sota, A.: Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, 18008, Granada, Spain
Trigueros Páez, E.: Centro de Astrobiología, CSIC-INTA, Campus ESAC, Camino bajo del castillo s/n, 28692 Vill. de la Cañada, Madrid, Spain; Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Escuela Politécnica Superior, Universidad de Alicante, Carretera San Vicente del Raspeig s/n, 03690, San Vicente del Raspeig, Alicante, Spain
Caballero, J. A.: Centro de Astrobiología, CSIC-INTA, Campus ESAC, Camino bajo del castillo s/n, 28692 Vill. de la Cañada, Madrid, Spain
Alfaro, E. J.: Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, 18008, Granada, Spain
Publication: Astronomy & Astrophysics, Volume 615, id.A161, 7 pp.
Date: 07/2018
Keywords: binaries: spectroscopic; binaries: visual; methods: data analysis; stars: early-type; stars: massive; techniques: spectroscopic; Astrophysics - Solar and Stellar Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics
DOI: 10.1051/0004-6361/201832885
ADS: 2018A&A...615A.161M  [Bibtex entry]

Abstract

Context. Many massive stars have nearby companions whose presence hamper their characterization through spectroscopy.
Aims: We want to obtain spatially resolved spectroscopy of close massive visual binaries to derive their spectral types.
Methods: We obtained a large number of short long-slit spectroscopic exposures of five close binaries under good seeing conditions. We selected those with the best characteristics, extracted the spectra using multiple-profile fitting, and combined the results to derive spatially separated spectra.
Results: We demonstrate the usefulness of Lucky Spectroscopy by presenting the spatially resolved spectra of the components of each system, in two cases with separations of only 0.''3. Those are δ Ori Aa+Ab (resolved in the optical for the first time) and σ Ori AaAb+B (first time ever resolved). We also spatially resolve 15 Mon AaAb+B, ζ Ori AaAb+B (both previously resolved with GOSSS, the Galactic O-Star Spectroscopic Survey), and η Ori AaAb+B, a system with two spectroscopic B+B binaries and a fifth visual component. The systems have in common that they are composed of an inner pair of slow rotators orbited by one or more fast rotators, a characteristic that could have consequences for the theories of massive star formation.

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