2006A&A...445..143C


Query : 2006A&A...445..143C

2006A&A...445..143C - Astronomy and Astrophysics, volume 445, 143-153 (2006/1-1)

S Ori J053825.4-024241: a classical T Tauri-like object at the substellar boundary.

CABALLERO J.A., MARTIN E.L., ZAPATERO OSORIO M.R., BEJAR V.J.S., REBOLO R., PAVLENKO Y. and WAINSCOAT R.

Abstract (from CDS):

We present a spectrophotometric analysis of SOri J053825.4-024241, a candidate member close to the substellar boundary of the young (1-8Myr), nearby (∼360pc) σ Orionis star cluster. Our optical and near-infrared photometry and low-resolution spectroscopy indicate that SOri J053825.4-024241 is a likely cluster member with a mass estimated from evolutionary models at 0.06+0.07–0.02M, which makes the object a probable brown dwarf. The radial velocity of SOri J053825.4-024241 is similar to the cluster systemic velocity. This target, which we have classified as an M6.0±1.0 low-gravity object, shows excess emission in the near-infrared and anomalously strong photometric variability for its type (from the blue to the J band), suggesting the presence of a surrounding disc. The optical spectroscopic observations show a continuum excess at short wavelengths and a persistent and resolved Hα emission (pseudo-equivalent width of ~-250Å) in addition to the presence of other forbidden and permitted emission lines, which we interpret as indicating accretion from the disc and possibly mass loss. We conclude that despite the low mass of SOri J053825.4-024241, this object exhibits some of the properties typical of active classical T Tauri stars.

Abstract Copyright:

Journal keyword(s): stars: low mass, brown dwarfs - accretion, accretion discs - stars: variables: general - Galaxy: open clusters and associations: individuals: σ Orionis

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 - 2022
#notes
1 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3184 0
2 V* V2728 Ori Or* 05 38 25.4373236808 -02 42 41.266014912   20.88 20.33 19.08 17.20 M7 31 0
3 2MASS J05382623-0240413 Y*O 05 38 26.2365289464 -02 40 41.397150432   21.25 20.45 19.08 16.99 M4.5 17 0
4 2MASS J05383858-0241558 Y*O 05 38 38.5944218448 -02 41 55.925390112 20.86 21.50 19.80 18.31 16.42 M5.5e 25 0
5 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 522 0
6 Mayrit 1045094 Y*O 05 39 54.3226700016 -02 37 18.974259444   20.61 20.81 19.05 17.05 M4.5 17 0
7 VB 10 Er* 19 16 57.6109547886 +05 09 01.600923413     17.30     M8V 459 1

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2022.05.24-10:37:07

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