국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Constraining the Properties of the Eta Carinae System via 3-D SPH Models of Space-Based Observations: The Absolute Orientation of the Binary Orbit
저자	Madura, Thomas I.;; Gull, Theodore R.;; Owocki, Stanley P.;; Okazaki, Atsuo T.;; Russell, Christopher M. P.
Keyword	COMPANION STARS;; HYDRODYNAMICS;; IMAGING TECHNIQUES;; NEBULAE;; RADIATIVE TRANSFER;; SPACEBORNE TELESCOPES;; SPECTRA;; SPECTROGRAPHS;; STELLAR LUMINOSITY;; STELLAR MASS;; STELLAR SYSTEMS;; SYMMETRY
URL	http://hdl.handle.net/2060/20110023552
보고서번호	none
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The extremely massive (> 90 Stellar Mass) and luminous (= 5 x 10(exp 6) Stellar Luminosity) star Eta Carinae, with its spectacular bipolar "Homunculus" nebula, comprises one of the most remarkable and intensely observed stellar systems in the Galaxy. However, many of its underlying physical parameters remain unknown. Multiwavelength variations observed to occur every 5.54 years are interpreted as being due to the collision of a massive wind from the primary star with the fast, less dense wind of a hot companion star in a highly elliptical (e approx. 0.9) orbit. Using three-dimensional Ɠ-D) Smoothed Particle Hydrodynamics (SPH) simulations of the binary wind-wind collision, together with radiative transfer codes, we compute synthetic spectral images of [Fe III] emission line structures and compare them to existing Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) observations. We are thus able, for the first time, to tightly constrain the absolute orientation of the binary orbit on the sky. An orbit with an inclination of approx. 40deg, an argument of periapsis omega approx. 255deg, and a projected orbital axis with a position angle of approx. 312deg east of north provides the best fit to the observations, implying that the orbital axis is closely aligned in 3-D space with the Homunculus symmetry axis, and that the companion star orbits clockwise on the sky relative to the primary.