NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Due to the lapse in federal government funding, NASA is not updating this website. We sincerely regret this inconvenience.

Back to Results
Observational studies of the clearing phase in proto-planetary disk systemsA 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.
Document ID
19940020783
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Grady, Carol A.
(Applied Research Corp. Landover, MD, United States)
Date Acquired
September 6, 2013
Publication Date
March 9, 1994
Subject Category
Astrophysics
Report/Patent Number
NAS 1.26:195182
R93-217
NASA-CR-195182
Report Number: NAS 1.26:195182
Report Number: R93-217
Report Number: NASA-CR-195182
Accession Number
94N25265
Funding Number(s)
CONTRACT_GRANT: NASW-4756
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available