Dust shells around high-latitude A-type stars
- 1 December 1989
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 241 (3) , 393-401
- https://doi.org/10.1093/mnras/241.3.393
Abstract
Near-infrared (JHKL) 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, ΔK = 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.Keywords
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