A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations

We report on both high-precision photometry from the <i>Microvariability and Oscillations of Stars</i> (MOST) space telescope and ground-based spectroscopy of the triple system δ Ori A, consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7 days, and a more distant tertiary (O9...

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Detalles Bibliográficos
Autor principal: Benvenuto, Omar Gustavo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Astronómicas
binaries: eclipsing
close
stars: early-type
stars: individual (delta Ori A)
stars: mass-loss
stars: variables: general
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86357
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86357
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
binaries: eclipsing
close
stars: early-type
stars: individual (delta Ori A)
stars: mass-loss
stars: variables: general
spellingShingle Ciencias Astronómicas
binaries: eclipsing
close
stars: early-type
stars: individual (delta Ori A)
stars: mass-loss
stars: variables: general
Benvenuto, Omar Gustavo
A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
topic_facet Ciencias Astronómicas
binaries: eclipsing
close
stars: early-type
stars: individual (delta Ori A)
stars: mass-loss
stars: variables: general
description We report on both high-precision photometry from the <i>Microvariability and Oscillations of Stars</i> (MOST) space telescope and ground-based spectroscopy of the triple system δ Ori A, consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7 days, and a more distant tertiary (O9 IV years). This data was collected in concert with X-ray spectroscopy from the <i>Chandra</i> X-ray Observatory. Thanks to continuous coverage for three weeks, the <i>MOST</i> light curve reveals clear eclipses between Aa1 and Aa2 for the first time in non-phased data. From the spectroscopy, we have a well-constrained radial velocity (RV) curve of Aa1. While we are unable to recover RV variations of the secondary star, we are able to constrain several fundamental parameters of this system and determine an approximate mass of the primary using apsidal motion. We also detected second order modulations at 12 separate frequencies with spacings indicative of tidally influenced oscillations. These spacings have never been seen in a massive binary, making this system one of only a handful of such binaries that show evidence for tidally induced pulsations.
format Articulo
Articulo
author Benvenuto, Omar Gustavo
author_facet Benvenuto, Omar Gustavo
author_sort Benvenuto, Omar Gustavo
title A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
title_short A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
title_full A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
title_fullStr A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
title_full_unstemmed A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
title_sort coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis aa. iii. analysis of optical photometric (most) and spectroscopic (ground-based) variations
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/86357
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AT benvenutoomargustavo coordinatedxrayandopticalcampaignofthenearestmassiveeclipsingbinarydorionisaaiiianalysisofopticalphotometricmostandspectroscopicgroundbasedvariations
bdutipo_str Repositorios
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