2010A&A...519A...7O


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET02:01:04

2010A&A...519A...7O - Astronomy and Astrophysics, volume 519, A7-7 (2010/9-1)

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. and MORALES N.

Abstract (from CDS):

The goal of the paper is to present new results on light echoes from young stellar objects. 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. 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±16pc 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 10000 AU in radius and containing ∼2x10–3M of dust. The cause of such concentration at ∼10000 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.

Abstract Copyright:

Journal keyword(s): stars: protostars - stars: variables: T Tauri, Herbig Ae/Be - stars: imaging

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HH 155 HH 04 21 57.1 +19 32 07           ~ 72 1
2 V* T Tau TT* 04 21 59.4323326335 +19 32 06.439974179   11.01 9.30 9.80   K0IV/Ve 1239 2
3 V* R Mon Ae* 06 39 09.9538710861 +08 44 09.559404231 10.76 12.46 11.85 10.96 10.25 B8IIIe 499 0
4 V* S CrA TT* 19 01 08.597088 -36 57 19.89504   11.76 10.91 11.41   G0Ve+K0Ve 258 0
5 NGC 6726 RNe 19 01 38 -36 53.5           ~ 33 0
6 NGC 6729 ISM 19 01 46.4 -36 57 40           ~ 54 0
7 V* R CrA Ae* 19 01 53.6850227874 -36 57 08.145519972 12.781 12.651 11.917 11.242 10.412 B5IIIpe 441 1

    Equat.    Gal    SGal    Ecl

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2019.12.12-02:01:04

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