2005A&A...432..619D


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.20CEST08:57:31

2005A&A...432..619D - Astronomy and Astrophysics, volume 432, 619-632 (2005/3-3)

On the nature of pre-main sequence candidate stars in the Large Magellanic Cloud.

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

Abstract (from CDS):

We investigate a sample of 18 Large Magellanic Cloud Herbig Ae/Be candidate stars looking at their (1) spectral types (2) brightness variability mechanism and (3) near infra-red JHK emission. We find that the majority of the target stars have Hα emission, are of spectral type early- to mid-B and lack strong JHK excess emission. Their Balmer decrements are found to be similar to that of Galactic Be stars in general. Their erratic brightness variability is evaluated by using the observed optical color excess and the color gradient from the light curves and is subsequently interpreted as being due to variable dust obscuration or variable bf-ff emission from circumstellar ionized gas. For approximately half of the target stars in our sample the type of variability seems to be dissimilar to the mechanism involving bound-free and free-free emission, but could be interpreted as caused by variable dust obscuration, as we have proposed in earlier studies. It is therefore suggested that they are pre-main sequence objects, despite the fact that they nearly all lack thermal dust emission in the near infra-red; mid/far infra-red observations for these objects are warranted. One star is observed to have JHK excess emission and an inspection of its 7.5-year MACHO light curve confirms its erratic photometric behavior. The object displays deep photometric minima with a quasi-period of 191.3-days, as generally seen in the Galactic pre-main sequence subgroup of the UXOrionis stars.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: emission-line, Be - stars: variables: general - stars: pre-main sequence - galaxies: Magellanic Clouds

Simbad objects: 49

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Number of rows : 49

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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9554 1
2 V* XY Per Ae* 03 49 36.3362509899 +38 58 55.551266650 12.12 10.14 9.58 9.54 8.40 A2II+B6 141 0
3 V* UX Ori Ae* 05 04 29.9881676817 -03 47 14.288047238 10.25 10.93 8.70 9.62 9.43 A4IVe 334 1
4 ELHC 20 pr* 05 16 22.362 -69 20 18.25   15.57 15.51 15.74 15.73 B1/5III/V(e) 4 0
5 ELHC 3 pr* 05 16 29.5487285665 -69 17 16.640527743   15.46 15.32     Be 8 0
6 ELHC 7 pr* 05 16 39.110 -69 20 47.90     17.210   17.019 B3Ve 12 0
7 MSX5C G280.3695-33.4793 IR 05 17 05.4 -69 33 41           ~ 1 0
8 ELHC 9 pr* 05 17 06.20 -69 33 23.3           ~ 3 0
9 ELHC 19 pr* 05 17 11.018 -69 25 51.93         16.09 B1/5III/Ve 6 0
10 ELHC 8 pr* 05 17 17.0953373877 -69 33 35.008168247       15.68 15.17 B2/4III/IVe 4 0
11 ELHC 4 pr* 05 17 17.634 -69 21 35.89       15.08 14.54 Be 7 0
12 ELHC 1 pr* 05 18 15.628 -69 30 13.54   19.3   15.3 15.39 ~ 8 0
13 ELHC 6 pr* 05 18 17.980 -69 35 31.94         15.62 Be 7 0
14 ELHC 5 pr* 05 18 21.633 -69 32 40.21     17.518   14.17 B/Ae 8 0
15 MSX5C G280.4587-33.3396 IR 05 18 28.9 -69 39 47           ~ 1 0
16 ELHC 2 pr* 05 18 34.210 -69 39 41.64         14.97 OBe 8 0
17 ELHC 11 pr* 05 18 35.481 -69 36 01.94       14.85   B1III(e) 4 0
18 LHA 120-N 119 HII 05 18 39.2 -69 13 22           ~ 51 1
19 NGC 1910 As* 05 18 42.50 -69 14 12.1     9.65     ~ 47 1
20 ELHC 12 pr* 05 18 50.4560910874 -69 35 25.415075534   18.3   15.65 15.29 B:e 4 0
21 ELHC 13 pr* 05 18 55.120 -69 36 37.32         15.14 B1/2III/Ve 5 0
22 LH 42 As* 05 18 58.0 -69 39 30           ~ 23 1
23 NGC 1918 SNR 05 19 04.50 -69 38 56.0           ~ 94 0
24 ELHC 21 pr* 05 19 44.1801818579 -69 26 14.296576047   14.74 14.79 15.73 15.75 B1/2III/Ve 3 0
25 [BE74] 561 EB* 05 19 47.7006070625 -69 39 12.160932523   13.76 13.56 13.95 13.461 F6 12 0
26 ELHC 14 pr* 05 19 54.329 -69 42 07.49       15.52 15.23 B1III/IVe 3 0
27 ELHC 16 pr* 05 20 27.5747637142 -69 35 39.117489311     15.261 15.48 15.53 B1/4III/V(e) 5 0
28 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14984 1
29 ELHC 15 pr* 05 27 22.9328274378 -69 52 15.569594563           ~ 3 0
30 ELHC 18 pr* 05 27 23.20 -69 52 01.9           ~ 3 0
31 ELHC 17 pr* 05 27 24.83 -69 51 50.1           ~ 3 0
32 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4522 2
33 HD 38150 PM* 05 38 25.7585804337 -67 11 05.929095634   9.64 9.15     F8V 13 0
34 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1751 1
35 HD 38872 * 05 45 55.0522812672 -52 44 18.330357143   8.91 8.66     A7III/IV 4 0
36 HD 45677 Be* 06 28 17.4219761127 -13 03 11.130589443 7.86 8.52 8.50 8.11 8.01 B2IV/V[e] 304 0
37 HD 259431 Ae* 06 33 05.1905483916 +10 19 19.987469692 8.39 8.95 8.72     B6ep 262 1
38 HD 53367 Ae* 07 04 25.5189757244 -10 27 15.613478141 6.81 7.40 6.96 7.92   B0IV/Ve 303 0
39 HD 164447 Be* 18 00 27.6581882611 +19 30 20.831392519 5.960 6.370 6.430     B8Vn 68 0
40 CD-24 13874 Ae* 18 05 49.7275038172 -24 15 20.733420769 11.74 12.12 11.29 10.91   B5:Vpe 44 0
41 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 944 2
42 EM* MWC 297 Ae* 18 27 39.5266257570 -03 49 52.136526892 15.57 14.34 12.31 11.34   B1.5Ve 266 0
43 BD+40 4124 Ae* 20 20 28.2415737117 +41 21 51.527810947 11.11 11.36 10.62 10.510   B2Ve 275 1
44 EM* LkHA 224 Ae* 20 20 29.3500765489 +41 21 28.448014439 14.82 14.08 12.93 12.05 11.08 A4:Ve 91 0
45 V* V645 Cyg Ae* 21 39 58.2775729406 +50 14 21.002745087   14.23 13.10 13.82   O6/9eq 255 0
46 BD+65 1637 Ae* 21 42 50.1799735837 +66 06 35.184005596 10.21 10.56 10.53 10.29   B3IV-Vne 147 1
47 EM* LkHA 234 Ae* 21 43 06.8214472757 +66 06 54.199354231 13.65 13.61 12.73 11.98 11.20 B5Ve 278 0
48 EM* AS 505 Ae* 23 05 07.4613720353 +62 15 36.502340613 10.09 11.5 10.9     B5Vep 57 0
49 EM* MWC 1080 Ae* 23 17 25.5890248379 +60 50 43.452566559   13.24 11.542     B0eq 307 0

    Equat.    Gal    SGal    Ecl

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2020.10.20-08:57:31

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