skip to main content

SciTech ConnectSciTech Connect

Title: INTERFEROMETRY OF ϵ AURIGAE: CHARACTERIZATION OF THE ASYMMETRIC ECLIPSING DISK

We report on a total of 106 nights of optical interferometric observations of the ϵ Aurigae system taken during the last 14 years by four beam combiners at three different interferometric facilities. This long sequence of data provides an ideal assessment of the system prior to, during, and after the recent 2009–2011 eclipse. We have reconstructed model-independent images from the 10 in-eclipse epochs which show that a disk-like object is indeed responsible for the eclipse. Using new three-dimensional, time-dependent modeling software, we derive the properties of the F-star (diameter, limb darkening), determine previously unknown orbital elements (Ω, i), and access the global structures of the optically thick portion of the eclipsing disk using both geometric models and approximations of astrophysically relevant density distributions. These models may be useful in future hydrodynamical modeling of the system. Finally, we address several outstanding research questions including mid-eclipse brightening, possible shrinking of the F-type primary, and any warps or sub-features within the disk.
Authors:
; ; ; ; ; ; ; ; ; ;  [1] ;  [2] ; ;  [3] ;  [4] ; ;  [5] ;  [6] ;  [7] ;  [8]
  1. The CHARA Array of Georgia State University, Mount Wilson Observatory, Mount Wilson, California 91023 (United States)
  2. Department of Physics and Astronomy, University of Denver, Denver, CO 80208 (United States)
  3. Department of Astronomy, University of Michigan, 941 Dennison Building, Ann Arbor, Michigan 48109 (United States)
  4. Department of Physics, Central Michigan University, Dow Science Complex 219, Mount Pleasant, Michigan, 48859 (United States)
  5. United States Naval Observatory, Flagstaff Station, 10391 West Naval Observatory Road, Flagstaff, Arizona 86001 (United States)
  6. Department of Physics and Astronomy, Penn. State, University Park, PA 16802 (United States)
  7. School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, Scotland (United Kingdom)
  8. University of St. Andrews, Scotland (United Kingdom)
Publication Date:
OSTI Identifier:
22520128
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 220; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; ASYMMETRY; ECLIPSE; INTERFEROMETRY; STAR MODELS; STARS; TIME DEPENDENCE