Observation of light echoes around very young stars

Aims. The goal of the paper is to present new results on light echoes from young stellar objects. Methods. Broad band CCD images were obtained over three months at one-to-two week intervals for the field of NGC 6726, using the large field-of-view remotely-operated telescope on top of Cerro Burek. Re...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Ortiz, J.L., Sugerman, B.E.K., De La Cueva, I., Santos-Sanz, P., Duffard, R., Gil-Hutton, R., Melita, M., Morales, N.
Formato: JOUR
Materias:
Herbig Ae/Be
Stars: imaging
Stars: protostars
Stars: variables: T Tauri
Broad bands
CCD images
Large field of views
Light echoes
Low-amplitude
New results
Oort cloud
Scattered light
T Tauri stars
Variable stars
Young stars
Young stellar objects
Dust
Sun
Stars
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v519_n4_p_Ortiz
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00046361_v519_n4_p_Ortiz
record_format dspace
spelling todo:paper_00046361_v519_n4_p_Ortiz2023-10-03T14:00:32Z Observation of light echoes around very young stars Ortiz, J.L. Sugerman, B.E.K. De La Cueva, I. Santos-Sanz, P. Duffard, R. Gil-Hutton, R. Melita, M. Morales, N. Herbig Ae/Be Stars: imaging Stars: protostars Stars: variables: T Tauri Broad bands CCD images Herbig Ae/Be Large field of views Light echoes Low-amplitude New results Oort cloud Scattered light Stars: imaging Stars: protostars Stars: variables: T Tauri T Tauri stars Variable stars Young stars Young stellar objects Dust Sun Stars Aims. The goal of the paper is to present new results on light echoes from young stellar objects. Methods. Broad band CCD images were obtained over three months at one-to-two week intervals for the field of NGC 6726, using the large field-of-view remotely-operated telescope on top of Cerro Burek. Results. We detected scattered light echoes around two young, low-amplitude, irregular variable stars. Observations revealed not just one, but multiple light echoes from brightness pulses of the T Tauri star S CrA and the Herbig Ae/Be star R CrA. Analysis of S CrA's recurring echoes suggests that the star is located 138 ± 16 pc from Earth, making these the closest echoes ever detected. The environment that scatters the stellar light from S CrA is compatible with an incomplete dust shell or an inclined torus some 10 000 AU in radius and containing ∼2 × 10-3 M ⊙of dust. The cause of such concentration at ∼10 000 AU from the star is unknown. It could be the remnant of the envelope from which the star formed, but the distance of the cloud is remarkably similar to the nominal distance of the Oort cloud to the Sun, leading us to also speculate that the dust (or ice) seen around S CrA might have the same origin as the Solar System Oort cloud. © 2010 ESO. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v519_n4_p_Ortiz
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Herbig Ae/Be
Stars: imaging
Stars: protostars
Stars: variables: T Tauri
Broad bands
CCD images
Herbig Ae/Be
Large field of views
Light echoes
Low-amplitude
New results
Oort cloud
Scattered light
Stars: imaging
Stars: protostars
Stars: variables: T Tauri
T Tauri stars
Variable stars
Young stars
Young stellar objects
Dust
Sun
Stars
spellingShingle Herbig Ae/Be
Stars: imaging
Stars: protostars
Stars: variables: T Tauri
Broad bands
CCD images
Herbig Ae/Be
Large field of views
Light echoes
Low-amplitude
New results
Oort cloud
Scattered light
Stars: imaging
Stars: protostars
Stars: variables: T Tauri
T Tauri stars
Variable stars
Young stars
Young stellar objects
Dust
Sun
Stars
Ortiz, J.L.
Sugerman, B.E.K.
De La Cueva, I.
Santos-Sanz, P.
Duffard, R.
Gil-Hutton, R.
Melita, M.
Morales, N.
Observation of light echoes around very young stars
topic_facet Herbig Ae/Be
Stars: imaging
Stars: protostars
Stars: variables: T Tauri
Broad bands
CCD images
Herbig Ae/Be
Large field of views
Light echoes
Low-amplitude
New results
Oort cloud
Scattered light
Stars: imaging
Stars: protostars
Stars: variables: T Tauri
T Tauri stars
Variable stars
Young stars
Young stellar objects
Dust
Sun
Stars
description Aims. The goal of the paper is to present new results on light echoes from young stellar objects. Methods. Broad band CCD images were obtained over three months at one-to-two week intervals for the field of NGC 6726, using the large field-of-view remotely-operated telescope on top of Cerro Burek. Results. We detected scattered light echoes around two young, low-amplitude, irregular variable stars. Observations revealed not just one, but multiple light echoes from brightness pulses of the T Tauri star S CrA and the Herbig Ae/Be star R CrA. Analysis of S CrA's recurring echoes suggests that the star is located 138 ± 16 pc from Earth, making these the closest echoes ever detected. The environment that scatters the stellar light from S CrA is compatible with an incomplete dust shell or an inclined torus some 10 000 AU in radius and containing ∼2 × 10-3 M ⊙of dust. The cause of such concentration at ∼10 000 AU from the star is unknown. It could be the remnant of the envelope from which the star formed, but the distance of the cloud is remarkably similar to the nominal distance of the Oort cloud to the Sun, leading us to also speculate that the dust (or ice) seen around S CrA might have the same origin as the Solar System Oort cloud. © 2010 ESO.
format JOUR
author Ortiz, J.L.
Sugerman, B.E.K.
De La Cueva, I.
Santos-Sanz, P.
Duffard, R.
Gil-Hutton, R.
Melita, M.
Morales, N.
author_facet Ortiz, J.L.
Sugerman, B.E.K.
De La Cueva, I.
Santos-Sanz, P.
Duffard, R.
Gil-Hutton, R.
Melita, M.
Morales, N.
author_sort Ortiz, J.L.
title Observation of light echoes around very young stars
title_short Observation of light echoes around very young stars
title_full Observation of light echoes around very young stars
title_fullStr Observation of light echoes around very young stars
title_full_unstemmed Observation of light echoes around very young stars
title_sort observation of light echoes around very young stars
url http://hdl.handle.net/20.500.12110/paper_00046361_v519_n4_p_Ortiz
work_keys_str_mv AT ortizjl observationoflightechoesaroundveryyoungstars
AT sugermanbek observationoflightechoesaroundveryyoungstars
AT delacuevai observationoflightechoesaroundveryyoungstars
AT santossanzp observationoflightechoesaroundveryyoungstars
AT duffardr observationoflightechoesaroundveryyoungstars
AT gilhuttonr observationoflightechoesaroundveryyoungstars
AT melitam observationoflightechoesaroundveryyoungstars
AT moralesn observationoflightechoesaroundveryyoungstars
_version_ 1807317252507172864

Ejemplares similares