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...
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2010
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v519_n4_p_Ortiz http://hdl.handle.net/20.500.12110/paper_00046361_v519_n4_p_Ortiz |
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paper:paper_00046361_v519_n4_p_Ortiz2023-06-08T14:27:54Z Observation of light echoes around very young stars 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. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v519_n4_p_Ortiz 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 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. |
| 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 |
| publishDate |
2010 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v519_n4_p_Ortiz http://hdl.handle.net/20.500.12110/paper_00046361_v519_n4_p_Ortiz |
| _version_ |
1768542294929047552 |