AN INTERFEROMETRIC AND SPECTROSCOPIC ANALYSIS OF THE MULTIPLE STAR SYSTEM HD 193322
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{sub sun}, respectively, and their spectral line broadening indicates that they represent extremes of fast and slow projected rotational velocity, respectively.
- OSTI ID:
- 21583057
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 142, Issue 1; Other Information: DOI: 10.1088/0004-6256/142/1/21; ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
Similar Records
GRAVITY Spectro-interferometric Study of the Massive Multiple Stellar System HD 93206 A
A SEARCH FOR SEPARATED FRINGE PACKET BINARIES USING THE CHARA ARRAY