Dust shells around high-latitude A-type stars

Details Dust shells around high-latitude A-type stars Dust shells around high-latitude A-type stars

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.241..393w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 241, Nov. 15, 1989, p. 393-401.

Astronomy and Astrophysics

Astronomy

10

A Stars, Binary Stars, Cosmic Dust, Stellar Envelopes, Stellar Spectrophotometry, Color-Color Diagram, Hertzsprung-Russell Diagram, Infrared Astronomy Satellite, Infrared Photometry, Light Curve, Stellar Oscillations

Scientific paper

Near-infrared photometry is presented for three A-type stars, HD 231, HD 3003 and HD 213985. Although all three appear to have cool dust shells, only in HD 213985 is the dust sufficiently warm to produce a near-infrared excess. HD 213985 shows remarkably regular variability with a period of 254 d and an amplitude, Delta K = 0.29 mag. No entirely satisfactory explanation for this variability is offered, though various possibilities are discussed. Radial pulsations are shown to be inconsistent with the available information and non-radial pulsations seem highly unlikely. The star may be a binary system, but in this case the character of the infrared variation in particular would seem to imply a rather contrived geometry for the system.

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