# 2002A&A...395..829D

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 Query : 2002A&A...395..829D

2002A&A...395..829D - Astronomy and Astrophysics, volume 395, 829-844 (2002/12-1)

A Search for HAeBe stars in the bar of the Large Magellanic Cloud based on optical variability.

DE WIT W.J., BEAULIEU J.P. and LAMERS H.J.G.L.M.

Abstract (from CDS):

We searched the EROS1 database consisting of 80000 stars in the bar of the Large Magellanic Cloud for blue objects with irregular photometric behavior similar to Galactic Herbig Ae/Be (HAeBe) stars. We found 14 new objects in addition to the discovery of 7 HAeBe candidate stars found in our previous studies. Based on their light curve and colours we classify these new objects also as EROS LMC HAeBe Candidates (ELHCs). The objects are located in an area of enhanced 60 µm emission, which indicates a star forming region. The stars are concentrated in three areas and the majority of the objects are clustered round the N120 nebular complex. The light curves are interpreted with a simple model, involving obscuration by an inhomogeneous orbiting circumstellar dust cloud as the dominant cause of the variability. We find that the dust orbiting the stars is at a radial distance in the order of 10 to a few 100 AUs. Most of the objects are bluer-when-fainter''. This is attributed to the presence of a (blue) scattering nebula with a size smaller than the point spread function of the photometric images. The stellar parameters are derived from the photometry. The luminosity of the stars is in the range of 3.4<log(L/L)<4.2 and the colours indicate spectral types O or B. The stars are located in the HR-diagram above the birthline for Galactic stars by about 1 dex in luminosity. The method used to detect the ELHCs stars on optical variability criteria is discussed. We show that our sample of HAeBe candidates in the EROS1 field of view is complete up to V≃16.5m for the typical amplitude and time scale of the ELHCs.

Journal keyword(s): stars: formation - stars: pre-main sequence - stars: variables: general - reflection nebulae - Magellanic Clouds - methods: data analysis

Nomenclature: Table 1, A1: ELHC NN (Nos 8-21) added.

Full paper

 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 - 2022
#notes
1 ELHC 20 Y*O 05 16 22.3659976584 -69 20 18.393709632   15.57 15.51 15.74 15.73 B1/5III/V(e) 4 0
2 ELHC 3 Y*O 05 16 29.5492104096 -69 17 16.639598904   15.46 15.32     Be 8 0
3 ELHC 7 Y*O 05 16 39.110 -69 20 47.90     17.210   17.019 B3Ve 12 0
4 ELHC 9 Y*O 05 17 06.20 -69 33 23.3           ~ 3 0
5 ELHC 19 Y*O 05 17 11.018 -69 25 51.93         16.09 B1/5III/Ve 6 0
6 ELHC 8 Y*O 05 17 17.0955602592 -69 33 35.004082428       15.68 15.17 B2/4III/IVe 4 0
7 ELHC 4 Y*O 05 17 17.6499285288 -69 21 35.895013344       15.08 14.54 Be 7 0
8 NGC 1903 Cl* 05 17 22.700 -69 20 08.17   12.00 11.86     ~ 64 1
9 ELHC 1 Y*O 05 18 15.6395698704 -69 30 13.631774220   19.3   15.3 15.39 ~ 8 0
10 ELHC 6 Y*O 05 18 17.9898285312 -69 35 31.830040464         15.62 Be 7 0
11 ELHC 5 Y*O 05 18 21.6449658864 -69 32 40.255109880     17.518   14.17 B/Ae 8 0
12 OGLE LMC-LPV-39315 LP* 05 18 34.2103997280 -69 39 41.642973648     16.719   14.992 OBe 9 0
13 ELHC 11 Y*O 05 18 35.481 -69 36 01.94       14.85   B1III(e) 4 0
14 LHA 120-N 119 HII 05 18 39.2 -69 13 22           ~ 54 1
15 ELHC 12 Y*O 05 18 50.4564084936 -69 35 25.412981820   18.3   15.65 15.29 B:e 4 0
16 ELHC 13 Y*O 05 18 55.120 -69 36 37.32         15.14 B1/2III/Ve 5 0
17 NGC 1918 SNR 05 19 04.50 -69 38 56.0           ~ 97 0
18 ELHC 21 Y*O 05 19 44.1802443696 -69 26 14.297625312   14.74 14.79 15.73 15.75 B1/2III/Ve 3 0
19 SNR J051945-692600 SNR 05 19 45.00 -69 26 00.0           ~ 44 0
20 [BE74] 561 EB* 05 19 47.7007510680 -69 39 12.161158776   13.76 13.56 13.95 13.461 F6 12 0
21 ELHC 14 Y*O 05 19 54.3407562552 -69 42 07.472028276       15.52 15.23 B1III/IVe 3 0
22 ELHC 16 Y*O 05 20 27.5746595712 -69 35 39.116907024     15.261 15.48 15.53 B1/4III/V(e) 5 0
23 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16153 1
24 ELHC 15 Y*O 05 27 22.9329964584 -69 52 15.568256676           ~ 3 0
25 ELHC 18 Y*O 05 27 23.20 -69 52 01.9           ~ 3 0
26 ELHC 17 Y*O 05 27 24.8383307112 -69 51 50.241476448           ~ 3 0

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2022.08.10-06:44:53

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