The Beta Pictoris protoplanetary system. XIV - Simultaneous observations of the CA II H and K lines; evidence for diffuse and broad absorption features

Details The Beta Pictoris protoplanetary system. XIV - Simultaneous observations of the CA II H and K lines; evidence for diffuse and broad absorption features The Beta Pictoris protoplanetary system. XIV - Simultaneous observations of the CA II H and K lines; evidence for diffuse and broad absorption features

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..137f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. 137-144.

Astronomy and Astrophysics

Astrophysics

31

H Lines, K Lines, Main Sequence Stars, Metallicity, Protoplanets, Stellar Envelopes, Absorption Spectra, Calcium, Diffuse Radiation, Line Spectra

Scientific paper

The sporadic circumstellar spectroscopic variations detected since 1985 towards Beta Pic have been formerly interpreted as the result of the evaporation of small cometary-like bodies in the vicinity of the star. To further investigate the physics of the infalling bodies, we developed new instrumentation able to monitor simultaneously the variability of the two Ca II H and K lines, in order to give access to different parameters than the ones previously surveyed. Because the instrument, whose resolving power is of the order of 10,000, is attached to small size telescopes (one meter class) via a fiber link, the new information is related to a more continuous survey of the lines variability over few weeks periods. We present the detection of new very broad and shallow absorption signatures, seen simultaneously in the vicinity of the two Ca II lines. The results obtained confirm our original model by showing that the variability of the events seems to be erratic on these time scales and that the absorbing material has to be spread quite often over areas significantly smaller than the stellar projected surface. They further reveal the existence of more gaseous material very close to the star, produced by the evaporation of 'body-showers', probably made of multiple smaller bodies impossible to detect individually.

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