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Detection of accreting circumstellar gas around weak emission-line Herbig Ae/Be starsWe present archival and recent IUE high dispersion spectra of late B stars which reveal the presence of accreting gas with velocities as high as 350 km/s, collisional ionization of the accreting gas to temperatures above the stellar T(sub eff), and column densities intermediate between those observed toward classical Herbig Ae/Be stars and the nearby proto-planetary system beta Pictoris. One of the stars, HD 176386, while lacking obvious optical signatures of youth, is a member of the R CrA star formation region, and with an inferred age of 2.8 Myr has not yet arrived on the zero-age main sequence (ZAMS). The other object, an isolated, field B star with pronounced IR excess due to warm, circumstellar dust, 51 Oph, exhibits only modest H(alpha) emission. The combination of high velocity, accreting gas in systems with IR excesses due to circumstellar dust suggests that not only are these objects candidate proto-planetary systems, but that they may represent an extension to higher stellar masses of the weak-emission pre-main sequence (PMS) stars.
Document ID
19950031685
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Grady, C. A.
(NASA Goddard Space Flight Center Greenbelt, MD, US, United States)
Perez, M. R.
(NASA Goddard Space Flight Center Greenbelt, MD, US, United States)
The, P. S.
(Univ. of Amsterdam Amsterdam, Netherlands)
Date Acquired
August 16, 2013
Publication Date
February 1, 1994
Publication Information
Publication: Astrophysics and Space Science
Volume: 212
ISSN: 0004-640X
Subject Category
Astronomy
Accession Number
95A63284
Funding Number(s)
CONTRACT_GRANT: NAS5-32059
CONTRACT_GRANT: NAS5-31841
Distribution Limits
Public
Copyright
Other

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