Observations of gaseous circumstellar disks. III

Details Observations of gaseous circumstellar disks. III Observations of gaseous circumstellar disks. III

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308..854h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. 854-858.

Astronomy and Astrophysics

Astrophysics

29

Infrared Spectra, Interstellar Gas, Stellar Envelopes, Stellar Spectra, Absorption Spectra, F Stars, Radiant Flux Density, Spectral Line Width

Scientific paper

Echelle spectra obtained at the Ca II K line and the Na I D lines are reported for seven stars which show excess fluxes in at least one of the IRAS bands at 25, 60, and 100 microns. Detectable circumstellar absorption lines arising from the gaseous components of the presumed circumstellar dust disks are found in none of these cases, in contrast to the previously reported case of Beta Pic. Conversely, six A or F stars which were known before the launch of IRAS to show gaseous circumstellar disks do not show excess fluxes in any of the IRAS bands. Similar echelle spectra of these stars show Ca II circumstellar absorption lines comparable in four cases to that of Beta Pic.

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