Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-04-25
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Scientific paper
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 that we use to determine its orbital motion around a close companion Ab2 ($P = 312$ d) and around a distant third star Aa ($P = 35$ y).We have also obtained long baseline interferometry of the target in the $K^\prime$-band with the CHARA Array that 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 $23 M_\odot$, respectively, and their spectral line broadening indicates that they represent extremes of fast and slow projected rotational velocity, respectively.
Jr.
Farrington Christopher D.
Fullerton Alexander W.
Gies Douglas R.
Grundstrom Erika D.
No associations
LandOfFree
An Interferometric and Spectroscopic Analysis of the Multiple Star System HD 193322 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An Interferometric and Spectroscopic Analysis of the Multiple Star System HD 193322, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An Interferometric and Spectroscopic Analysis of the Multiple Star System HD 193322 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-294973