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


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.19CET16:48:34

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 - 2020
#notes
1 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2924 0
2 V* V2728 Ori Or* 05 38 25.4362816834 -02 42 41.261836830   20.88 20.33 19.08 17.20 M7 30 0
3 2MASS J05382623-0240413 Y*O 05 38 26.2366116920 -02 40 41.404641626   21.25 20.45 19.08 16.99 M4.5 17 0
4 2MASS J05383858-0241558 Y*O 05 38 38.5945611243 -02 41 55.919882016 20.86 21.50 19.80 18.31 16.42 M5.5e 24 0
5 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 475 0
6 Mayrit 1045094 Y*O 05 39 54.3226122744 -02 37 18.966776375   20.61 20.81 19.05 17.05 M4.5 17 0
7 VB 10 Fl* 19 16 57.6103282334 +05 09 01.588675251   19.42 17.30     M8V 427 1

    Equat.    Gal    SGal    Ecl

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2020.01.19-16:48:34

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