2012A&A...546A..59C


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET12:08:00

2012A&A...546A..59C - Astronomy and Astrophysics, volume 546A, 59-59 (2012/10-1)

Stars and brown dwarfs in the σ Orionis cluster. III. OSIRIS/GTC low-resolution spectroscopy of variable sources.

CABALLERO J.A., CABRERA-LAVERS A., GARCIA-ALVAREZ D. and PASCUAL S.

Abstract (from CDS):

Although many studies have been performed so far, there are still dozens of low-mass stars and brown dwarfs in the young σ Orionis open cluster without detailed spectroscopic characterisation. We look for unknown strong accretors and disc hosts that were undetected in previous surveys. We collected low-resolution spectroscopy (R∼700) of ten low-mass stars and brown dwarfs in σ Orionis with OSIRIS at the Gran Telescopio Canarias under very poor weather conditions. These objects display variability in the optical, infrared, Hα, and/or X-rays on time scales of hours to years. We complemented our spectra with optical and near-/mid-infrared photometry. For seven targets, we detected lithium in absorption, identified Hα, the calcium doublet, and forbidden lines in emission, and/or determined spectral types for the first time. We characterise in detail a faint, T Tauri-like brown dwarf with an 18h-period variability in the optical and a large Hα equivalent width of -125±15Å, as well as two M1-type, X-ray-flaring, low-mass stars, one with a warm disc and forbidden emission lines, the other with a previously unknown cold disc with a large inner hole. New unrevealed strong accretors and disc hosts, even below the substellar limit, await discovery among the list of known σ Orionis stars and brown dwarfs that are variable in the optical and have no detailed spectroscopic characterisation yet.

Abstract Copyright:

Journal keyword(s): stars: late-type - stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be - quasars: emission lines - clusters open and associations: individual: σ Orionis - X-rays: stars

Simbad objects: 29

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Number of rows : 29

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 994 0
2 2MASS J05373153-0224269 Y*O 05 37 31.536 -02 24 26.96   17.32 15.85 14.72 13.45 M3 9 0
3 [W96] rJ053754-0239 Y*O 05 37 54.4032171635 -02 39 29.792561856   11.80 10.91   10.274 G5.0 16 0
4 2MASS J05375630-0245130 G 05 37 56.3074678754 -02 45 13.203129202         16.734 ~ 7 0
5 NAME Ori I As* 05 38 -02.8           ~ 566 0
6 Kiso A-0904 67 Y*O 05 38 06.7457000396 -02 30 22.747725674 17.703 16.46 15.08 14.08 13.14 M1 17 0
7 V* V505 Ori Or* 05 38 27.2561074187 -02 45 09.709148403     14.16 13.54 12.85 K7e 34 0
8 [W96] rJ053832-0235b LM* 05 38 32.8465301359 -02 35 39.260429967 17.600 15.90 14.59 13.74 12.88 K6.0 16 0
9 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 496 0
10 [HHM2007] 683 LM* 05 38 42.3952648528 -02 36 04.529449012       17.75 15.685 ~ 9 0
11 [W96] rJ053843-0233 LM* 05 38 43.5574840383 -02 33 25.440695940 17.743 16.52 15.14 14.16 13.07 M1 16 0
12 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 751 0
13 [W96] pJ053847-0234 TT* 05 38 47.1884633123 -02 34 36.918854535 17.17 18.43 17.36 16.38 14.81 M4.0 15 0
14 * sig Ori E Y*O 05 38 47.2050001416 -02 35 40.514907495 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 404 0
15 [W96] 4771-899 TT* 05 38 48.0385008503 -02 27 14.172609947 16.327 14.47 13.21 12.41 11.54 K7e 24 0
16 2MASS J05385542-0241208 Y*? 05 38 55.4294376168 -02 41 20.879454467     21.25   18.59 ~ 13 0
17 2MASS J05390193-0235029 Y*O 05 39 01.9389175758 -02 35 02.903447076 19.818 20.72 19.68 18.46 17.11 M4 21 0
18 [BZR99] S Ori 28 Y*? 05 39 23.1930476028 -02 46 55.769581456   22.63 21.06 19.41 17.23 M5.5 21 0
19 2MASS J05393729-0226567 Y*O 05 39 37.2966707292 -02 26 56.804815353 17.790 16.25 14.84 13.89 12.98 M0 12 0
20 Mayrit 1196092 Y*O 05 40 04.5326197819 -02 36 42.091189449   20.69   19.94 17.73 M6 21 0
21 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 451 0
22 Feige 34 HS* 10 39 36.7377085527 +43 06 09.209752646 9.613 10.91 11.14 11.319 11.464 sdOp 615 0
23 LP 731-58 Er* 10 48 12.6142482968 -11 20 09.609457904     15.784 16.01 11.25 M6.5V 145 0
24 Wolf 461 Er* 13 00 33.5210484063 +05 41 08.003260810   15.12   13.041   M4.5Ve 115 0
25 G 150-7 PM* 13 31 50.5833965857 +23 23 20.377890738       11.863   M2.5Ve 24 0
26 Ross 1022 PM* 13 38 37.0540039983 +25 49 49.582032027   13.9   12.199   M3.0Ve 27 0
27 LP 380-6 PM* 13 48 13.4122238872 +23 36 48.703598917   17.26   14.3   M5V 32 0
28 L 763-63 LM* 13 59 10.4103991464 -19 50 03.661101342   14.558 12.88 11.60 9.90 M4.5V 49 0
29 Ross 640 WD* 16 28 25.0030292072 +36 46 15.849157470   14.01   13.9   DZ6 176 0

    Equat.    Gal    SGal    Ecl

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2021.01.27-12:08:00

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