2008A&A...491..515C


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET10:34:46

2008A&A...491..515C - Astronomy and Astrophysics, volume 491, 515-523 (2008/11-4)

Low-resolution spectroscopy and spectral energy distributions of selected sources towards σ Orionis.

CABALLERO J.A., VALDIVIELSO L., MARTIN E.L., MONTES D., PASCUAL S. and PEREZ-GONZALEZ P.G.

Abstract (from CDS):

We study in detail nine sources in the direction of the young σ Orionis cluster, which is considered to be a unique site for studying stellar and substellar formation. The nine sources were selected because of their peculiar properties, such as extremely-red infrared colours or excessively strong Hα emission for their blue optical colours. We acquired high-quality, low-resolution spectroscopy (R∼500) of the nine targets with ALFOSC at the Nordic Optical Telescope. We also re-analysed [24]-band photometry from MIPS/Spitzer and compiled the highest quality photometric dataset available at the V i J H Ks passbands and the four IRAC/Spitzer channels, for constructing accurate spectral energy distributions between 0.55 and 24µm. The nine targets were classified into: one Herbig Ae/Be star with a scattering edge-on disc; two G-type stars; one X-ray flaring, early-M, young star with chromospheric Hα emission; one very low-mass, accreting, young spectroscopic binary; two young objects at the brown-dwarf boundary with the characteristics of classical T Tauri stars; and two emission-line galaxies, one undergoing star formation, and another whose spectral energy distribution is dominated by an active galactic nucleus. We also discovered three infrared sources associated with overdensities in a cold cloud of the cluster centre. Low-resolution spectroscopy and spectral energy distributions are a vital tool for measuring the physical properties and evolution of young stars and candidates in the σ Orionis cluster.

Abstract Copyright:

Journal keyword(s): stars: emission-line, Be - stars: low-mass, brown dwarfs - stars: pre-main sequence - Galaxy: open clusters and associations: individual: σ Orionis - galaxies: quasars: emission lines

Simbad objects: 26

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Number of rows : 26

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 V* UX Ori Ae* 05 04 29.9881676817 -03 47 14.288047238 10.25 10.93 8.70 9.62 9.43 A4IVe 336 1
2 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 238 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2019 1
4 Cl Collinder 69 OpC 05 35 06 +09 56.0     2.8     ~ 232 0
5 HD 294275 Y*O 05 37 31.8728312238 -02 45 18.465113643   9.51 9.42   9.360 A0 18 0
6 2MASS J05374491-0229573 Y*O 05 37 44.9162940937 -02 29 57.309866006   11.50 10.95   10.747 ~ 11 1
7 2MASS J05374557-0229585 Y*? 05 37 45.5732659584 -02 29 58.530698301         11.762 ~ 8 1
8 2MASS J05375161-0235257 Y*O 05 37 51.6119417355 -02 35 25.695389711 18.636   15.64 14.56 13.34 M2.0 17 0
9 EM* StHA 50 Em* 05 38 34.4424906028 -02 28 47.637591927   11.26 11.30   11.004 Be 10 0
10 DENIS J053841.2-023737 * 05 38 41.2346379777 -02 37 37.752291558         17.55 ~ 11 1
11 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 492 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 747 0
13 NAME sig Ori IRS 1 * 05 38 44.9 -02 35 57           ~ 15 0
14 NAME sig Ori IRS 3A IR 05 38 47.6 -02 35 14           ~ 1 0
15 NAME sig Ori IRS 2 IR 05 38 51.0 -02 36 24           ~ 2 0
16 [BNM2013] 90.02 91 LM* 05 38 51.4547907556 -02 36 20.620056036 16.090 18.23 17.47 16.09 14.38 K5V 14 0
17 2MASS J05385542-0241208 Y*? 05 38 55.4294376168 -02 41 20.879454467     21.25   18.59 ~ 13 0
18 NAME sig Ori IRS 3B IR 05 38 58.7 -02 35 30           ~ 1 0
19 2MASS J05390088-0253163 * 05 39 00.8849205506 -02 53 16.344227873     12.61   11.85 ~ 3 0
20 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
21 HH 446 HH 05 39 25.6129225958 -02 38 43.724943438         17.228 ~ 14 0
22 2MASS J05393270-0226154 * 05 39 32.6750052936 -02 26 15.318911356     18.5   17.622 ~ 3 0
23 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 451 0
24 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 574 1
25 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1077 1
26 LP 666-9 LM* 08 53 36.1607609203 -03 29 32.201339067     18.959 16.781 14.487 M9Ve 226 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-10:34:46

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