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The location of the Ca II ions in the beta Pictoris diskEchelle spectra of beta Pictoris have been obtained in the region of the Ca II 8542A line which arises from the metastable 3d 2D5/2 level. A narrow, weak, circumstellar absorption line is seen at the stellar radial velocity. A simple theory is developed of the radiative pumping of the metastable levels of the Ca II ions by the radiation from the star at the H and K lines. The relatively large fractional population, N3(Ca II)/N1(Ca II) of roughly 0.05, observed for the metastable level then requires that the calcium absorbers be largely concentrated within about 1 AU of the star. This result confirms two previous, independent estimates of the location of this gas. A time-variable circumstellar component of the 8542A line also is found at an infall velocity of about 15 km/s.
Document ID
19890028108
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hobbs, L. M.
(Chicago Univ. Chicago, IL, United States)
Welty, D. E.
(Chicago, University IL, United States)
Lagrange-Henri, A. M.
(Chicago Univ. Chicago, IL, United States)
Ferlet, R.
(Chicago Univ. Chicago, IL, United States)
Vidal-Madjar, A.
(CNRS Institut d'Astrophysique, Paris, France)
Date Acquired
August 14, 2013
Publication Date
November 1, 1988
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 334
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
89A15479
Funding Number(s)
CONTRACT_GRANT: NGR-14-001-147
Distribution Limits
Public
Copyright
Other

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