The Serendipitous Discovery of a Debris Disk around the A Dwarf HD 46190
Abstract
The Infrared Spectrograph on the Spitzer Space Telescope has observed several A dwarfs as potential standards and cross-calibrators, and one of these stars, HD 46190, shows the spectroscopic signature of a debris disk. The disk produces a spectral excess that can be fitted with a cool blackbody of ~81 K. If the emitting particles are spherical blackbodies, they would lie at a distance of ~82 AU from the central star. The spectrum from the disk can also be fitted with a spectrum rising proportionally with wavelength, and this spectral behavior is consistent with material falling into the inner disk as a result of Poynting-Robertson drag.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 2004
- DOI:
- 10.1086/425324
- Bibcode:
- 2004ApJ...614L..77S
- Keywords:
-
- Stars: Circumstellar Matter;
- Infrared: Stars;
- Stars: Individual: Henry Draper Number: HD 46190