An interferometric and spectroscopic analysis of the multiple star system HD 193322

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DOIResolve DOI: http://doi.org/10.1088/0004-6256/142/1/21
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TypeArticle
Journal titleAstronomical Journal
ISSN0004-6256
Volume142
Issue1
Article number21
AbstractThe star HD 193322 is a remarkable multiple system of massive stars that lies at the heart of the cluster Collinder 419. Here we report on new spectroscopic observations and radial velocities of the narrow-lined component Ab1 which we use to determine its orbital motion around a close companion Ab2 (P = 312 days) and around a distant third star Aa (P = 35 years). We have also obtained long baseline interferometry of the target in the K′ band with the CHARA Array which we use in two ways. First, we combine published speckle interferometric measurements with CHARA separated fringe packet measurements to improve the visual orbit for the wide Aa,Ab binary. Second, we use measurements of the fringe packet from Aa to calibrate the visibility of the fringes of the Ab1,Ab2 binary, and we analyze these fringe visibilities to determine the visual orbit of the close system. The two most massive stars, Aa and Ab1, have masses of approximately 21 and 23 M ⊙, respectively, and their spectral line broadening indicates that they represent extremes of fast and slow projected rotational velocity, respectively. © 2011. The American Astronomical Society. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21271140
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Record identifier27918a7b-448b-4345-8173-764dc3717ffe
Record created2014-03-24
Record modified2016-05-09
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