Bibcode
ten Brummelaar, Theo A.; O'Brien, David P.; Mason, Brian D.; Farrington, Christopher D.; Fullerton, Alexander W.; Gies, Douglas R.; Grundstrom, Erika D.; Harkopf, William I.; Matson, Rachel A.; McAlister, Harold A.; McSwain, M. Virginia; Roberts, Lewis C.; Schaefer, Gail H.; Simón-Díaz, S.; Sturmann, Judit; Sturmann, Laszlo; Turner, Nils H.; Williams, Stephen J.
Bibliographical reference
The Astronomical Journal, Volume 142, Issue 1, article id. 21 (2011).
Advertised on:
7
2011
Citations
18
Refereed citations
14
Description
The 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 sun, respectively, and
their spectral line broadening indicates that they represent extremes of
fast and slow projected rotational velocity, respectively.
Related projects
Physical properties and evolution of Massive Stars
This project aims at the searching, observation and analysis of massive stars in nearby galaxies to provide a solid empirical ground to understand their physical properties as a function of those key parameters that gobern their evolution (i.e. mass, spin, metallicity, mass loss, and binary interaction). Massive stars are central objects to
Sergio
Simón Díaz