2022A&A...663A..74C


Query : 2022A&A...663A..74C

2022A&A...663A..74C - Astronomy and Astrophysics, volume 663A, 74-74 (2022/7-1)

Pre-main sequence stars in LH 91.

CARINI R., BIAZZO K., DE MARCHI G., PANAGIA N., BECCARI G. and BROCATO E.

Abstract (from CDS):


Aims. We study the accretion properties of pre-main sequence (PMS) low-mass stars in the LH 91 association within the Large Magellanic Clouds.
Methods. Using optical multiband photometry obtained with the Hubble Space Telescope, we identify 75 candidates showing Hα excess emission above the 3σ level with equivalent width EWHα ≥ 10 Å. We estimate the physical parameters (effective temperature, luminosity, age, mass, accretion luminosity, and mass accretion rate) of the PMS stellar candidates.
Results. The age distribution suggests a period of active star formation ranging from a few million years up to ∼60 Myr with a gap between ∼5 Myr and 10 Myr. The masses of the PMS candidates span from 0.2 M for the cooler objects to 1.0 M with a median of ∼0.80 M. The median value of the accretion luminosity of our 75 PMS stars is about 0.12 L, the median value of the mass accretion rate is about 4.8 x 10–9 M yr–1 with higher values for the younger population (∼1.2 x 10–8 M yr–1), and lower values for the older candidates (∼4.7 x 10–9 M yr–1). We compare our results with findings for LH 95, the closest region to LH 91 for which accretion properties of PMS candidates were previously derived. An interesting qualitative outcome is that LH 91 seems to be in a more evolved stage. Moreover, we find that the PMS candidates are distributed homogeneously, without any evidence of clumps around more massive stars.

Abstract Copyright: © ESO 2022

Journal keyword(s): accretion, accretion disks - stars: pre-main sequence - stars: formation - Magellanic Clouds - open clusters and associations: individual: LH 91 - techniques: photometric

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6487 1
2 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1311 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16388 1
4 NAME LMC 4 Supergiant Shell sh 05 31 33 -66 40.5           ~ 173 0
5 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4761 2
6 LH 91 As* 05 36 36 -66 27.2   11.25 11.01     ~ 16 0
7 DEM L 251 HII 05 36 40.2 -66 26 31           ~ 11 1
8 LHA 120-N 64C EmO 05 37 02.7 -66 21 18           ~ 20 0
9 [HS66] 367 As* 05 37 03.767 -66 22 02.69           ~ 45 0
10 LH 95I As* 05 37 19 -66 28.0           ~ 4 0
11 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1126 2
12 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1896 1

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2022.11.28-12:49:16

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