C.D.S. - SIMBAD4 rel 1.7 - 2020.09.18CEST11:00:56

2009A&A...495L..13R - Astronomy and Astrophysics, volume 495, L13-16 (2009/2-4)

Discovery of an old photoevaporating disk in σ Orionis.


Abstract (from CDS):

The photoevaporation of circumstellar disks is a powerful process in the disk dissipation at the origin of the Orion proplyds. This Letter reports the first detection of a photoevaporating disk in the final but long-lasting phase of its evolution. The disk is associated to a low-mass T Tauri member of the σ Ori Cluster. It is characterized by a very low (if any) accretion rate and by a tenuous ({dot}(M)loss∼10–9M/yr) photoevaporation wind, which is unambiguously detected in the optical spectrum of the object. The wind emits strong forbidden lines of [SII] and [NII] because the low-mass star is close to a powerful source of ionizing photons, the O9.5 star σ Ori.

Abstract Copyright:

Journal keyword(s): stars: formation - accretion, accretion disks

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 [W96] rJ053833-0236 TT* 05 38 34.0615489873 -02 36 37.594110884 19.530   16.39 15.24 13.72 M3-M4e 28 0
2 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 490 0
3 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 744 0

    Equat.    Gal    SGal    Ecl

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