IAFE 05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Observation of Light Echoes Around Very Young Stars
Autor/es:
ORTIZ, J.L., SUGERMAN, B.E.K., DE LA CUEVA, I. SANTOS-SANZ, P., DU ARD, R, GIL-HUTTON, R, MELITA, M, AND MORALES, N
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Año: 2010
ISSN:
0004-6361
Resumen:
Aims. The main goal of this work is to show that echoes can be detected from young, low-amplitude irregular variable stars.Methods. Broad band CCD images from a large field of view telescope were used.Results. We present the detection of scattered light echoes around two young, low-amplitude, irregular variable stars. Observationstaken over a three-month period have revealed not just one, but multiple light echoes from brightness pulses of the T Tauri star S CrAand the Herbig Ae/Be star R CrA. Analysis of S CrAs recurring echoes suggests that the star is located 138 1016 pc from Earth, makingthese the closest echoes ever detected. The environment that scatters the stellar light from S CrA is compatible with an incompletedust shell or an inclined torus some 10,000 AU in radius and containing of order 2:103 M of dust. The cause of such concentrationat 10,000AU from the star is not known, but the distance of the cloud is remarkably similar to the nominal distance of the Oortcloud to the Sun, leading us to speculate that the dust (or ice) seen around S CrA might share a similar origin as the the Solar SystemOort cloud.
