Extent of Excess Far-Infrared Emission around Luminosity Class III Stars

Show simple item record

dc.contributor.author Silverstone, Murray
dc.date.accessioned 2019-06-13T19:06:14Z
dc.date.available 2019-06-13T19:06:14Z
dc.date.issued 2001
dc.identifier.citation Kim, S., Zuckerman, B., Silverstone, M. (2001): Extent of Excess Far-Infrared Emission around Luminosity Class III Stars. The Astronomical Journal, 550(2). DOI: https://doi.org/10.1086/319803 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5748
dc.description.abstract With the Infrared Space Observatory, we conducted 3 × 3 pixel imaging photometry of 12 luminosity class III stars, which were previously presumed to have dust particles around them, at far-infrared wavelengths (60 and 90 μm). Eleven out of 12 targets show a peak of excess (above photosphere) far-infrared emission at the location of the star, implying that the dust particles are truly associated with stars. To estimate the size of the excess emission source, the flux ratio of center to boundary pixels of the 3 × 3 array was examined. The radius of the dust emission is found to be ~3000 to ~10,000 AU for a thin shell distribution and ~5000 to ~25,000 AU for a uniform distribution. We consider three models for the origin of the dust: disintegration of comets, sporadic dust ejection from the star, and emission from nearby interstellar cirrus. The data seem to rule out the first model (as far as the "Kuiper belt-like" particles are assumed to be large blackbody grains) but do not enable us to choose between the other two models. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject circumstellar matter en_US
dc.subject infrared: stars en_US
dc.subject stars: late-type en_US
dc.title Extent of Excess Far-Infrared Emission around Luminosity Class III Stars en_US
dc.type text en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search DSpace


Browse

My Account