The origin of the CA II and NA I absorptions towards HR2174

Details The origin of the CA II and NA I absorptions towards HR2174 The origin of the CA II and NA I absorptions towards HR2174

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246..507l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 2, June 1991, p. 507-510.

Astronomy and Astrophysics

Astronomy

5

Interstellar Matter, Shell Stars, Stellar Envelopes, Stellar Radiation, Stellar Spectrophotometry, Calcium, Infrared Astronomy Satellite, Sodium, Stellar Spectra

Scientific paper

New Ca II and Na I observations are presented which definitely set the origins of the strong Ca II and Na I absorptions detected in the spectrum of HR2174, a possible Beta-Pictoris-like star. The Ca II origin is found to be mostly circumstellar; the Na I one interstellar. The consequences are twofold: first, the circumstellar (Ca II)/(Na I) ratio for HR2174 is close to the one observed in the case of Beta Pictoris; secondly, the strong Na I absorption clearly indicates the presence of a dense interstellar cloud closer than about 70 parsecs, in the direction of HR2174.

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