NDLI: Observational studies of the clearing phase in proto-planetary disk systems (Document No: 19940020783)

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Observational studies of the clearing phase in proto-planetary disk systems (Document No: 19940020783)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Grady, Carol A.
Copyright Year	1994
Description	A summary of the work completed during the first year of a 5 year program to observationally study the clearing phase of proto-planetary disks is presented. Analysis of archival and current IUE data, together with supporting optical observations has resulted in the identification of 6 new proto-planetary disk systems associated with Herbig Ae/Be stars, the evolutionary precursors of the beta Pictoris system. These systems exhibit large amplitude light and optical color variations which enable us to identify additional systems which are viewed through their circumstellar disks including a number of classical T Tauri stars. On-going IUE observations of Herbig Ae/Be and T Tauri stars with this orientation have enabled us to detect bipolar emission plausibly associated with disk winds. Preliminary circumstellar extinction studies were completed for one star, UX Ori. Intercomparison of the available sample of edge-on systems, with stars ranging from 1-6 solar masses, suggests that the signatures of accreting gas, disk winds, and bipolar flows and the prominence of a dust-scattered light contribution to the integrated light of the system decreases with decreasing IR excess.
File Size	360780
Page Count	7
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19940020783
Archival Resource Key	ark:/13960/t8tb61s2v
Language	English
Publisher Date	1994-03-09
Access Restriction	Open
Subject Keyword	Astrophysics B Stars Extinction Visual Observation Color Herbig-haro Objects Accretion Disks Stellar Envelopes Protoplanets Stellar Mass A Stars Bipolarity Iue T Tauri Stars Signatures Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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