The location of the CA II ions in the beta Pictoris disk

Details The location of the CA II ions in the beta Pictoris disk The location of the CA II ions in the beta Pictoris disk

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334l..41h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. L41-L44.

Astronomy and Astrophysics

Astrophysics

40

Atomic Energy Levels, Calcium, Line Spectra, Stellar Envelopes, Absorption Spectra, Echelle Gratings, Interstellar Extinction, Parity, Radial Velocity

Scientific paper

Echelle 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.

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