Long-term infrared variability of the UX Ori-type star SV Cep
| dc.creator | Juhasz, Attila | |
| dc.creator | Prusti, Timo | |
| dc.creator | Abraham, Peter | |
| dc.creator | Dullemond, Cornelis P. | |
| dc.date | 2006-12-11 | |
| dc.date.accessioned | 2026-07-07T10:21:13Z | |
| dc.date.available | 2026-07-07T10:21:13Z | |
| dc.description | We investigate the long-term optical-infrared variability of SV Cep, and explain it in the context of an existing UX Ori (UXOR) model. A 25-month monitoring programme was completed with the Infrared Space Observatory in the 3.3-100 um wavelength range. Following a careful data reduction, the infrared light curves were correlated with the variations of SV Cep in the V-band. A remarkable correlation was found between the optical and the far-infrared light curves. In the mid-infrared regime the amplitude of variations is lower, with a hint for a weak anti-correlation with the optical changes. In order to interpret the observations, we modelled the spectral energy distribution of SV Cep assuming a self-shadowed disc with a puffed-up inner rim, using a 2-dimensional radiative transfer code. We found that modifying the height of the inner rim, the wavelength-dependence of the long-term optical-infrared variations is well reproduced, except the mid-infrared domain. The origin of variation of the rim height might be fluctuation in the accretion rate in the outer disc. In order to model the mid-infrared behaviour we tested to add an optically thin envelope to the system, but this model failed to explain the far-infrared variability. Infrared variability is a powerful tool to discriminate between models of the circumstellar environment. The proposed mechanism of variable rim height may not be restricted to UXOR stars, but might be a general characteristic of intermediate-mass young stars. | |
| dc.description | 11 pages, 9 figures, accepted for publiction in Monthly Notices of the Royal Astronomical Society | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0612270 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0612270 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc.374:1242-1252,2007 | |
| dc.identifier | doi:10.1111/j.1365-2966.2006.11208.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/175099 | |
| dc.subject | Astrophysics | |
| dc.title | Long-term infrared variability of the UX Ori-type star SV Cep | |
| dc.type | text |