2012MNRAS.421.3622P


Query : 2012MNRAS.421.3622P

2012MNRAS.421.3622P - Mon. Not. R. Astron. Soc., 421, 3622-3640 (2012/April-3)

Study of candidate Be stars in the Magellanic Clouds using near-infrared photometry and optical spectroscopy.

PAUL K.T., SUBRAMANIAM A., MATHEW B., MENNICKENT R.E. and SABOGAL B.

Abstract (from CDS):

Mennickent et al. and Sabogal et al. identified a large number of classical Be (CBe) candidates ( ∼ 3500) in the Large and Small Magellanic Clouds (LMC and SMC) based on their photometric variability using the OGLE II data base. They classified these stars into four different groups based on the appearance of their variability. In order to refine and understand the nature of this large number of stars, we studied the infrared properties of the sample and the spectroscopic properties of a subsample. We cross-correlated the optical sample with the IRSF-MCPS catalogue to obtain the J, H, Ks magnitudes of all the four types of stars ( ∼ 2500) in the LMC and SMC. Spectra of 120 stars belonging to the types 1, 2 and 3 were analysed to study their spectral properties. Among the four types, the type 4 stars are the dominant group, with ∼ 60 and ∼ 65 per cent of the total sample in the LMC and SMC, respectively. The near-infrared (NIR) colour–colour diagrams suggest that the type 4 stars in the LMC have a subclass, which is not found in our Galaxy or in the SMC. This subclass is ∼ 18 per cent of the type 4 sample. The main type 4 sample which is ∼ 49 per cent of the total sample has NIR properties similar to the Galactic CBe stars and the SMC type 4 stars. Though the new subclass of type 4 stars have high E(B-V) ∼ 0.75, they are not located close to regions with high reddening. The type 3 stars ( ∼ 6 per cent and 7.3 per cent in the LMC and SMC) are found to have large Hα equivalent width (EW) in the SMC and some are found to have large NIR excess. This small fraction of stars are unlikely to be CBe stars. Three stars among the type 3 stars in the LMC are found to be double periodic variables. The type 2 stars are found in larger fraction in the SMC ( ∼ 14.5 per cent), when compared to the LMC ( ∼ 6 per cent). The spectroscopic and the NIR properties suggest that these could be CBe stars. The type 1 stars are relatively more in the LMC ( ∼ 24 per cent) when compared to the SMC ( ∼ 13 per cent). The SMC type 1 stars have relatively large Hα EW and this class has properties similar to CBe stars. The spectroscopic sample of type 1 stars which show Hα in emission and are confirmed as CBe stars are more abundant in the SMC by a factor of 2.6. If the effect of metallicity is to cause more CBe stars in the SMC, when compared to the LMC, then type 1, type 2 and type 4 stars follow this rule, with an enhancement of 2.6, 2.4 and 1.3, respectively.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): techniques: spectroscopic - circumstellar matter - stars: emission-line, Be - Magellanic Clouds

VizieR on-line data: <Available at CDS (J/MNRAS/421/3622): table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat table9.dat table10.dat tablea1.dat tablea2.dat>

Simbad objects: 104

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Number of rows : 104
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 OGLE J003631.42-733917.8 Be? 00 36 31.42 -73 39 17.8           ~ 1 0
2 OGLE J003918.20-733656.6 Be? 00 39 18.1754754600 -73 36 56.903306904   15.032 14.548   13.834 F0 2 0
3 OGLE J004225.27-731718.2 Be? 00 42 25.27 -73 17 18.2           ~ 1 0
4 OGLE J004236.69-733033.1 Be? 00 42 36.69 -73 30 33.1           ~ 1 0
5 OGLE J004304.50-730206.3 Be? 00 43 04.4906400072 -73 02 06.856766628           ~ 1 0
6 OGLE J004327.71-731653.9 Be? 00 43 27.71 -73 16 53.9           ~ 1 0
7 LHA 115-S 3 Em* 00 43 36.8879622984 -73 26 38.221533492 14.26 14.39 14.09   13.73 A7-F5Ie 14 0
8 OGLE J004454.66-730802.9 Be? 00 44 54.66 -73 08 02.9           B8-A1 1 0
9 OGLE J004521.57-731717.7 Be? 00 45 21.57 -73 17 17.7           ~ 1 0
10 OGLE J004554.14-731404.3 Be? 00 45 54.0711145200 -73 14 04.929730332 16.33 16.04 15.41   14.73 F0Ib-II 6 0
11 OGLE J004626.57-731929.3 Be? 00 46 26.57 -73 19 29.3           ~ 1 0
12 OGLE J004652.17-731409.2 Be? 00 46 52.17 -73 14 09.2           ~ 1 0
13 OGLE J004701.71-731041.9 Be? 00 47 01.71 -73 10 41.9           ~ 1 0
14 LIN 91 Em* 00 47 21.8409244152 -73 06 50.534155476   14.026 14.026   13.84 B0-B2 6 0
15 OGLE J004750.14-731316.4 Be? 00 47 50.1384653952 -73 13 16.869909936 15.91 15.64 15.32   14.97 B7-8III 6 0
16 OGLE J004801.80-731057.0 Be? 00 48 01.80 -73 10 57.0           ~ 1 0
17 OGLE J004803.29-730722.2 Be? 00 48 03.29 -73 07 22.2           ~ 1 0
18 [MA93] 256 Em* 00 48 48.8213003688 -73 06 20.526931620   14.342 14.382   14.268 B0-B2 4 0
19 OGLE J004849.49-724800.0 Be? 00 48 49.4959051320 -72 48 00.391173768   15.345 15.138   14.75 B0-B2 2 0
20 OGLE J004916.20-724941.2 Be? 00 49 16.20 -72 49 41.2           ~ 1 0
21 OGLE J004921.41-725844.9 Be? 00 49 21.41 -72 58 44.9   14.934 14.614   14.11 A5II 6 0
22 OGLE J004930.81-731236.5 Be? 00 49 30.81 -73 12 36.5           ~ 1 0
23 [MA93] 309 Be* 00 49 38.0002137672 -73 06 10.448128152   14.312 14.435   14.33 B0-B3 6 0
24 OGLE J004958.39-725750.8 Be? 00 49 58.39 -72 57 50.8           ~ 1 0
25 OGLE J005018.69-725524.3 Be? 00 50 18.69 -72 55 24.3           ~ 1 0
26 OGLE J005025.64-725807.1 Be? 00 50 25.6762298616 -72 58 07.429702224 14.48 14.29 13.86   13.56 F4IV 6 0
27 LIN 160 WR* 00 50 43.4248908624 -73 27 05.815089828 12.363 13.304 13.426   13.55 WN6 46 0
28 LIN 165 Em* 00 50 59.2291245192 -72 43 57.672500376   14.785 14.805   14.453 B0-B2 6 0
29 OGLE J005059.66-725648.3 Be? 00 50 59.66 -72 56 48.3           ~ 1 0
30 LIN 166 Em* 00 51 00.1838555160 -72 53 04.262775468 12.55 13.55 13.56   13.52 B1II-IIIe 28 0
31 OGLE J005217.74-725627.9 Be? 00 52 17.74 -72 56 27.9           ~ 1 0
32 OGLE J005224.40-724038.6 Be? 00 52 24.4126164528 -72 40 39.074576880   14.032 14.032   14.011 B0-B2 3 0
33 OGLE J005227.51-732001.2 Be? 00 52 27.5040126000 -73 20 01.774525380   13.187 13.186   13.138 B0-B2 2 0
34 OGLE J005235.60-723751.7 * 00 52 35.6064931296 -72 37 52.139410824     14.573     B0-B2 2 0
35 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10364 1
36 OGLE J005251.97-723508.5 Be? 00 52 51.9863032872 -72 35 08.882106324   14.479 14.637   14.38 B0-B3 5 0
37 OGLE J005359.22-723508.9 Be? 00 53 59.2176918792 -72 35 09.288418632 14.26 14.55 14.38   14.13 A3III 7 0
38 AzV 163 Em* 00 55 04.5479651424 -72 46 37.539446268 13.22 14.01 14.20   14.40 B1II: 9 0
39 [MA93] 836 Em* 00 55 20.2840702776 -72 37 10.350714612 14.51 14.91 14.84   14.44 A0Ibe 10 0
40 OGLE J005614.45-724053.2 Be? 00 56 14.4710563536 -72 40 53.628064320   14.643 14.348   13.872 A5-A7 2 0
41 LIN 301 HXB 00 56 14.6498456760 -72 37 55.371919332   14.618 14.568   14.219 B1-5(II) 14 0
42 OGLE J005617.49-730005.1 Be? 00 56 17.6036701896 -73 00 04.312034496           ~ 1 0
43 Cl* NGC 330 ARP III-222 Be? 00 56 18.5605819920 -72 26 45.343356468 13.80 13.92 13.98   13.71 A2II 14 0
44 LIN 313 Em* 00 56 41.71 -72 44 25.7   14.604 14.717   14.854 B0-B3 5 0
45 OGLE J005710.71-722550.2 Be? 00 57 10.71 -72 25 50.2           ~ 1 0
46 AzV 194 Be? 00 57 45.2673414408 -72 35 32.558993844 12.66 13.677 13.823   13.94 B1III 12 0
47 [MA93] 1056 Em* 00 58 06.0518884728 -72 35 44.834205840   14.831 14.838   14.767 B0-B3 4 0
48 RX J0058.2-7231 HXB 00 58 12.5869662000 -72 30 48.759613812 13.91 14.98 14.87   14.62 B0IIIe 59 0
49 [MA93] 1135 Em* 00 59 16.0769746416 -72 21 00.519702444   14.478 14.512   14.352 B1-5(II)e? 5 0
50 LIN 363 Em* 01 00 00.7924580424 -72 55 23.147080032 13.90 14.42 14.33   13.99 B8-9IIIe 16 0
51 OGLE SMC-SC9 13304 Be? 01 00 25.1131438632 -72 46 32.616493608 13.68 14.55 14.77   14.95 B1-5(II) 5 0
52 AzV 256 Be? 01 00 41.9351410560 -72 30 28.948761252 13.47 14.59 14.71   14.95 B0(IV) 20 0
53 [MLD95] SMC 16 Be? 01 00 43.9414438872 -72 26 05.152501464 13.16 14.18 14.35   14.49 O9.5III 14 0
54 AzV 261 Em* 01 00 58.7194191624 -72 30 50.235757380 12.93 13.90 14.01   13.98 B2(Ib)e 17 0
55 LIN 391 Em* 01 02 13.8252377424 -72 22 13.291424652 13.35 14.40 14.31   14.14 B0.5(III) 9 0
56 LHA 115-S 39 Em* 01 04 01.1484920112 -72 33 11.475483264 12.56 13.101 13.120   12.996 O7III 13 0
57 LIN 435 Em* 01 04 47.2737213816 -72 25 59.697326640 13.65 14.72 14.73   14.70 B0-3(II)e 10 0
58 LHA 115-S 42 Em* 01 04 51.2531882088 -72 46 47.166153528 12.45 13.35 13.376 13.39 13.29 B1Ib-IIe 17 0
59 AzV 364 Em* 01 04 53.0178011976 -71 59 19.089031560 12.99 14.06 14.21   14.37 B2IIIe 13 0
60 LIN 446 Be* 01 05 42.6139408560 -72 27 47.670242724   14.846 14.794   14.515 B0-B3 5 0
61 AzV 432 Be? 01 08 07.4141502264 -72 19 32.783603700   14.008 14.189   14.309 B0 4 0
62 AzV 433 Em* 01 08 09.5580112392 -72 15 56.996531100 13.27 14.301 14.54   14.73 B0.5(III)e 12 0
63 LHA 115-S 54 Em* 01 08 25.8443187960 -72 23 27.317187312 12.72 13.99 13.89   13.82 B0(II)e 18 0
64 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6410 1
65 OGLE J050017.58-692749.9 Be? 05 00 17.58 -69 27 49.9           ~ 1 0
66 OGLE J050039.16-692003.9 Be? 05 00 39.16 -69 20 03.9           ~ 1 0
67 OGLE J050052.36-685803.7 Be? 05 00 52.2921636672 -68 58 03.598007268           F9 1 0
68 OGLE J050053.02-692011.5 Be? 05 00 53.02 -69 20 11.5           ~ 1 0
69 OGLE J050103.77-691746.7 Be? 05 01 03.77 -69 17 46.7           ~ 1 0
70 OGLE J050116.74-692027.7 Be? 05 01 16.74 -69 20 27.7           ~ 1 0
71 OGLE J050122.35-690004.9 Be? 05 01 22.35 -69 00 04.9           ~ 1 0
72 OGLE J050127.92-685947.7 Be? 05 01 27.92 -68 59 47.7           ~ 1 0
73 OGLE J050131.42-684251.0 Be? 05 01 31.42 -68 42 51.0           ~ 1 0
74 OGLE J050132.69-692845.8 Be? 05 01 32.69 -69 28 45.8           ~ 1 0
75 OGLE J050147.90-692424.1 Be? 05 01 47.90 -69 24 24.1           ~ 1 0
76 OGLE J050151.04-692109.6 Be? 05 01 51.04 -69 21 09.6           ~ 1 0
77 OGLE J050151.61-690152.8 Be? 05 01 51.61 -69 01 52.8           ~ 1 0
78 OGLE J050158.32-684315.5 Be? 05 01 58.32 -68 43 15.5           ~ 1 0
79 OGLE J050221.24-690451.6 Be? 05 02 21.24 -69 04 51.6           ~ 1 0
80 OGLE J050234.22-683939.8 Be? 05 02 34.22 -68 39 39.8           ~ 1 0
81 OGLE J050303.70-690615.0 Be? 05 03 03.6947440344 -69 06 14.812837416           A9-F0 1 0
82 OGLE J050306.60-691807.5 Be? 05 03 06.60 -69 18 07.5           ~ 1 0
83 OGLE J050320.42-685315.7 Be? 05 03 20.42 -68 53 15.7           ~ 1 0
84 OGLE J050340.10-691530.9 Be? 05 03 40.10 -69 15 30.9           ~ 1 0
85 OGLE J050350.56-690223.0 Be? 05 03 50.56 -69 02 23.0           ~ 1 0
86 OGLE J050412.28-685021.7 Be? 05 04 12.28 -68 50 21.7           ~ 1 0
87 OGLE J050426.31-690714.4 Be? 05 04 26.31 -69 07 14.4           ~ 1 0
88 OGLE J050428.01-690927.5 Be? 05 04 28.01 -69 09 27.5           ~ 1 0
89 OGLE J050438.96-691624.6 Be? 05 04 38.96 -69 16 24.6           ~ 1 0
90 OGLE J050447.46-690552.3 Be? 05 04 47.46 -69 05 52.3           ~ 1 0
91 OGLE J050521.34-691550.1 Be? 05 05 21.34 -69 15 50.1           ~ 1 0
92 OGLE J050848.63-684315.6 Be? 05 08 48.5600317080 -68 43 15.441401460           A6 1 0
93 SV* HV 915 RV* 05 14 18.1109835264 -69 12 34.872203808 15.837 14.924 14.552 13.96 13.853 F7-9Ibpe 26 0
94 SV* HV 2423 RV* 05 16 47.4341880600 -69 44 15.087084972     15.175 14.54 14.341 F3 16 0
95 OGLE BRIGHT-LMC-ECL-68 EB* 05 17 44.3243954088 -69 20 33.278831412     13.110   13.015 B8-A1 2 0
96 OGLE J051747.85-690908.6 Be? 05 17 47.85 -69 09 08.6           ~ 1 0
97 [BE74] 561 EB* 05 19 47.7007510680 -69 39 12.161158776   13.76 13.56 13.95 13.461 F6 12 0
98 OGLE LMC-SC6 40874 El* 05 20 32.1542652696 -69 42 24.082949160   14.73 14.99 14.31 14.35 F6 5 0
99 SV* HV 2479 RV* 05 22 58.3558094712 -69 26 20.985945504     14.749   14.065 F6 11 0
100 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16246 1
101 OGLE J052402.01-694920.5 Be? 05 24 01.8925713744 -69 49 20.567329680           B2-B3 1 0
102 OGLE J052652.49-693317.2 Be? 05 26 52.3512287904 -69 33 17.233446060           ~ 1 0
103 OGLE J052938.98-693448.0 V* 05 29 38.8484390736 -69 34 47.998408728     14.452     B2-B3 2 0
104 OGLE J053319.88-701213.1 Be? 05 33 19.88 -70 12 13.1           ~ 1 0

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2022.09.27-04:56:31

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