Circumstellar Gas Around the Peculiar lambda Bootis Stars

Details Circumstellar Gas Around the Peculiar lambda Bootis Stars Circumstellar Gas Around the Peculiar lambda Bootis Stars

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.8307b&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #83.07; Bulletin of the American Astronomical Society, Vol. 26, p.1455

Astronomy and Astrophysics

Astronomy

1

Scientific paper

A survey of northern lambda Boo stars has been carried out in order to search for evidence of circumstellar gas around this small group of peculiar, metal-deficient early A stars. We have discovered shell lines suggestive of circumstellar material superimposed on the broad photospheric Na I D lines of several program stars. These observations raise the total number of lambda Boo stars which show evidence for circumstellar gas or dust to approximately one-half of the entire class and provide additional strong support for the suggestion that the abundance peculiarities of the lambda Boo stars arise because they are currently accreting their atmospheres from circumstellar gas which has been metal depleted by selective condensation into grains. In addition, a sequence of spectra of the Ca II K line for at least one object has resulted in the first discovery of spectrum variability among the lambda Boo stars.

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