2021MNRAS.507.3660B

Query : 2021MNRAS.507.3660B

2021MNRAS.507.3660B - Mon. Not. R. Astron. Soc., 507, 3660-3671 (2021/November-1)

Identification of emission-line stars in transition phase from pre-main sequence to main sequence.

BHATTACHARYYA S., MATHEW B., BANERJEE G., ANUSHA R., PAUL K.T. and KARTHA S.S.

Abstract (from CDS):

Pre-main-sequence (PMS) stars evolve into main-sequence (MS) phase over a period of time. Interestingly, we found a scarcity of studies in existing literature that examine and attempt to better understand the stars in PMS to MS transition phase. The purpose of this study is to detect such rare stars, which we named as 'transition phase' (TP) candidates - stars evolving from the PMS to the MS phase. We identified 98 TP candidates using photometric analysis of a sample of 2167 classical Be (CBe) and 225 Herbig Ae/Be (HAeBe) stars. This identification is done by analysing the near- and mid-infrared excess and their location in the optical colour-magnitude diagram. The age and mass of 58 of these TP candidates are determined to be between 0.1-5 Myr and 2-10.5 M☉, respectively. The TP candidates are found to possess rotational velocity and colour excess values in between CBe and HAeBe stars, which is reconfirmed by generating a set of synthetic samples using the machine learning approach.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): methods: statistical - techniques: photometric - stars: emission-line, Be - stars: evolution

Simbad objects: 101

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Number of rows : 101
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 EM* GGR 190 Be* 00 32 44.5592685240 +63 18 16.752499596 11.38 11.61 11.09     B8Iae 17 0
2 2MASS J00324800+6647596 Be* 00 32 48.0119628480 +66 47 59.555884632           B3e 6 0
3 ZTF J004121.38+650413.1 RS* 00 41 21.3891249536 +65 04 13.096551929           B 6 0
4 EM* MWC 674 Be* 00 42 26.4756803568 +64 03 00.168697476 11.36 11.536 10.848 10.50   B1IIIe 27 0
5 IPHAS J004353.19+595641.6 Be* 00 43 53.1763880592 +59 56 41.640211248           B1Ve 2 0
6 EM* AS 4 Be* 00 44 42.1821503088 +63 54 27.974403072 10.89 11.204 10.580     B1IV-V:pe 25 0
7 EM* MWC 678 Be* 00 49 48.2027589360 +60 59 10.012681104 9.78 10.17 9.89     B2:V:nnep 21 0
8 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
9 2MASS J00543685+6305498 Be* 00 54 36.855 +63 05 49.84           B2-3e 4 0
10 HBHA 6210-03 Be* 01 09 58.7965583400 +62 52 29.254696212     13.6     B3e 10 0
11 IPHAS J011543.99+660116.2 Be* 01 15 43.9335508128 +66 01 16.181325552           B3e 4 0
12 IPHAS J012320.11+635830.9 Be* 01 23 20.0957763312 +63 58 30.682954776     13.6     B3e 6 0
13 EM* GGA 55 Be* 01 33 28.6887660000 +61 07 59.354575644     13.6     B4Ve 6 0
14 EM* GGA 56 Be* 01 33 41.8971574752 +60 42 19.669410288   11.61 11.35     B2Ve 21 0
15 IPHAS J020325.84+584145.0 Be* 02 03 25.8379572360 +58 41 44.823813036           B3-4Ve 2 0
16 EM* GGA 150 Be* 02 18 02.0320895904 +56 51 22.022000964 12 12.38 11.85     ~ 21 0
17 EM* GGA 154 Be* 02 19 08.6306583552 +57 03 48.981718584     12.4462   11.8649 B5Ve 17 0
18 EM* GGA 156 Be* 02 19 28.8227174880 +57 07 04.543663836   11.564 11.003     B0-1Ve 24 0
19 BD+55 589 Be* 02 20 54.9403873992 +56 23 18.109812840   10.68 10.60     B2IV-Ve 28 0
20 IPHAS J022107.83+625754.6 Be* 02 21 07.8305190360 +62 57 54.544743612           B 3 0
21 BD+56 559 Be* 02 21 18.0751032000 +57 18 22.097122308   10.33 9.882     B1IIIe 45 0
22 EM* MWC 447 Be* 02 22 46.9733702856 +56 58 05.892098700 10.51 10.93 10.593     B0e 37 0
23 BD+58 458 Be* 02 23 29.5524129072 +58 57 48.572554536 9.75 10.26 9.86     Be 39 0
24 HD 15450 Be* 02 31 19.5349415736 +56 53 52.184645556 10.064 9.28 9.00     B1IIIe 63 0
25 EM* AS 63 Be* 02 33 10.5550227552 +57 32 54.104521128 12.25 11.79 11.218     B0-1Ve 25 0
26 BD+57 607a Be* 02 40 09.2293282248 +57 45 41.680930644   11.35 10.73     Be 19 0
27 IPHAS J024252.56+611953.9 Be* 02 42 52.5841317000 +61 19 53.873612184           B3e 4 0
28 2MASS J02430559+6316147 Be* 02 43 05.5955928192 +63 16 14.697210504           B 3 0
29 2MASS J02455388+6354148 Be* 02 45 53.8640990784 +63 54 14.835752460           B3-4Ve 4 0
30 2MASS J02475308+6134057 Be* 02 47 53.0799548160 +61 34 05.749979412           B1Ve 6 0
31 [KAG2008] 10573 Be* 02 55 02.3795275104 +60 50 01.707496332           B8.0 7 0
32 2MASS J03013361+5935186 Be* 03 01 33.6094372080 +59 35 18.519268704           B3 4 0
33 EM* MWC 465 Be* 03 53 58.2519822792 +46 53 51.767754504 10.08 10.60 10.19     B0ne 20 0
34 HD 277707 Be* 05 12 11.6249304336 +39 33 20.377433808 10.11 10.55 10.41     Bpe 27 0
35 NGC 1893 35 Be* 05 22 43.0138065288 +33 25 05.419907184 14.04 14.24 13.585   12.376 B1Ve 28 0
36 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
37 HD 35347 Be* 05 25 17.8250669112 +29 36 53.601715872 8.31 9.04 8.93     B1Ve 40 0
38 HD 35929 Ae* 05 27 42.7906489200 -08 19 38.446702140   8.55 8.11     F2IV/V 125 0
39 HD 290500 Or* 05 29 48.0515601936 -00 23 43.508069160   11.35 11.04     A2 44 0
40 BD-06 1253 Ae* 05 36 25.4320468080 -06 42 57.684730284   11.65 10.9 10.29   A1e 450 1
41 Parenago 2649 Ae* 05 38 09.3040171896 -06 49 16.595034888   15.361 13.860 13.438   A5e 80 0
42 V* V599 Ori Or* 05 38 58.6396084320 -07 16 45.626538792   15.39 13.70 12.61   A8.9 71 0
43 HD 39340 Be* 05 53 06.0927479808 +26 26 43.437549948 7.67 8.17 8.13     B3V 61 0
44 BD-14 1319 ** 06 03 37.05936 -14 53 02.5116           A0Va-e 36 0
45 2MASS J06065848-0555066 TT* 06 06 58.4991960744 -05 55 06.700428156   12.97 12.44     A0 24 0
46 HD 254647 Be* 06 17 34.6135591152 +11 11 27.309147360 9.72 10.414 10.043 9.900   Bpe 18 1
47 2MASS J06310363+1001133 TT* 06 31 03.6354952152 +10 01 13.512117792   12.84 12.13     F5Ve 17 0
48 HD 46380 Be* 06 32 43.2318471312 -07 30 32.278170996 7.88 8.43 8.00 8.84   B2/B3IVne 77 0
49 NGC 2264 84 TT* 06 40 42.1820308368 +09 33 37.422060732 12.575 12.57 12.01 11.74 11.33 G0 87 0
50 NGC 2264 108 TT* 06 40 51.1854488784 +09 44 46.109300100 12.684 12.42 12.004 11.661 11.35 F8V 90 0
51 EM* RJHA 40 Be* 06 42 29.7796119288 +00 53 58.209064872   14.00 13.17 12.723   B3Ib 15 0
52 ZTF J064503.44-003413.8 Be* 06 45 03.4408749312 -00 34 13.916755740   14.82 13.902 14.04   K3V 14 0
53 HD 49977 Be* 06 50 26.4710933328 -14 06 48.120784992 7.58 8.17 7.97 8.78   B5/7ne 56 0
54 HD 50083 Be* 06 51 45.7534246176 +05 05 03.862857048 6.22 6.98 6.92     B3 114 0
55 NGC 2345 24 Be* 07 08 11.6221399080 -13 09 26.938896624   14.98 13.98     B3Ve 8 0
56 BD-14 1751 Be* 07 10 54.4612943736 -14 21 26.223541020 9.44 10.02 9.81 9.98   Be 13 0
57 HD 57775 Be* 07 22 24.8295918264 -10 49 21.480190068   9.44 9.36 9.64   Be 19 0
58 IRAS 07222-2610 Or* 07 24 17.5496283600 -26 16 05.296326924   14.73 14.20     A0 18 0
59 BD-19 1871 Be* 07 24 57.4829706720 -20 06 58.509849348 10 10.41 10.04 10.14   Be 14 0
60 BD-10 2073 Be* 07 29 58.9132257432 -11 15 48.683171772 9.56 10.42 10.29 10.40   B0:ne 17 0
61 CD-22 4761 Be* 07 35 47.5057856400 -22 52 38.932653000 9.69 10.52 10.07 10.15   B0:nne 33 0
62 BD-10 2133 Be* 07 37 37.7919129936 -10 58 20.412002784   10.39 10.39 10.56   Be 12 0
63 BD-11 2043 Be* 07 39 42.2416736376 -12 15 33.378832512 8.71 9.90 9.74 9.80   B0:ne 23 0
64 MR 8 Be* 07 43 13.0680315672 -29 18 33.787530036     12.5     OB+e 9 0
65 CD-23 6121 Be* 07 45 08.4060683760 -24 07 53.399459532 9.94 10.68 10.40 10.37   Be 21 0
66 CD-26 4955 Be* 07 46 36.1967838960 -26 41 40.032812724 10.11 10.85 10.52 10.42   Be 34 0
67 CD-28 5235 Be* 07 59 22.1552735400 -28 54 23.791416192 9.52 10.53 10.36 10.28   B1V 35 0
68 CD-30 5559 Be* 08 04 28.5785030136 -30 58 21.310131000 9.91 10.64 10.38 10.41   Bepec 23 0
69 CD-27 5181 Be* 08 14 03.7024492224 -28 19 25.677208452 10.39 11.09 10.92 10.94   Be 18 0
70 CD-29 6963 Be* 08 56 48.2457668592 -30 11 01.883103576   9.40 9.25     Be 18 0
71 * c Oph Be* 17 31 24.9538710166 -23 57 45.514802684 4.75 4.81 4.81 4.74 4.72 A0V 284 0
72 HD 160886 Be* 17 43 11.2141188528 -18 18 08.368623828   9.90 9.75 10.02   B3Vnne 31 0
73 HD 161103 HXB 17 44 45.7656635952 -27 13 44.478959340 8.44 9.23 9.13 9.12   B0.5III/IVe 95 0
74 HD 161306 Be* 17 45 07.7041298136 -09 48 54.445589568 8.35 8.78 8.30     B3/5Vnne 65 0
75 IRAS 17481-1415 Or* 17 50 58.0979075688 -14 16 11.857653336   13.33 12.77     A0 17 0
76 BD-14 5047 Be* 18 26 39.3110276784 -14 38 19.354958556 10.60 10.99 10.29 10.25   B0e 26 0
77 HD 169805 Be* 18 27 12.0067266840 -18 57 13.402018548 7.59 9.22 8.89 8.80   B2Vne 34 0
78 HD 170061 Be* 18 28 00.7384673256 -14 42 24.619829544 9.17 9.85 9.53 9.74   OBe 43 0
79 NGC 6649 9 Be* 18 33 28.3004329272 -10 24 08.756967024   12.98 11.76 10.6   B0Ve 26 0
80 HD 172694 Be* 18 42 16.5708437088 -15 51 20.829852396 7.61 8.32 8.12 9.04   B1:Vne 61 0
81 BD-05 4819 Be* 18 57 13.0291613376 -05 31 30.094879620 10.09 10.77 10.6     B2IV:pe 24 0
82 HD 184279 Be* 19 33 36.9185843448 +03 45 40.793081472 6.63 7.00 7.00     B0V 153 0
83 HD 187350 Be* 19 49 33.4538897304 -01 06 03.717545904 7.53 8.20 8.14     B1Vne 48 0
84 HD 227611 Be* 20 05 45.1471495080 +35 54 02.992953780 8.30 9.06 8.80     B1:III/Ve 74 0
85 HD 227836 Be* 20 08 04.5607105896 +36 07 26.044726044 10.58 10.754 10.517 10.174   B5Iae 46 0
86 EM* MWC 1015 Be* 20 21 33.5822468448 +37 24 51.700205016 13.75 13.28 11.84     B1.5Ve 61 1
87 HD 229221 Be* 20 23 45.9618575808 +38 30 03.153877668 9.95 10.05 9.281     B0.2IIIe 70 0
88 EM* MWC 1021 Ae* 20 29 26.9203768296 +41 40 43.899768732   15.573 12.846 11.807   Bep 27 0
89 Schulte 64 Be* 20 33 18.5309527200 +41 15 35.149489128 18.17 17.24 14.88     B1Ve-B3Ve 30 0
90 UCAC3 274-184438 Be* 20 35 41.5154917728 +46 46 49.533103380   13.78 12.85 12.28   B0Ve 8 0
91 EM* UHA 141 Be* 21 11 00.9469863936 +45 39 41.324822496   15 13     B1-3Ve 9 0
92 HD 205618 Be* 21 35 44.4770094600 +29 44 43.892316780 7.25 8.13 8.16     B2Vne 49 0
93 BD+46 3471 Ae* 21 52 34.0992801288 +47 13 43.605617340 10.72 10.56 10.15     A0.5IIIer 222 1
94 EM* GGR 50 Be* 22 12 19.6422959976 +57 16 05.386714500 12.73 13.00 12.20 12.02   B0-1Ve 17 0
95 ATO J334.9643+58.1481 Be* 22 19 51.4517536440 +58 08 53.468826072   13.80 12.68 12.61   B0Ve 11 0
96 EM* GGR 63 Be* 22 20 10.1058633840 +58 06 34.372077732   14.09 13.46 13.27   B1Ve 7 0
97 EM* MWC 659 Be* 22 47 45.3690745128 +57 16 50.803242924 9.98 10.42 10.15     B0.5Ve 31 0
98 [D75b] Em* 22-124 Be* 22 54 36.6180424056 +60 48 36.105010020 16.53 16.03 14.41 13.82 14.36 B0Ve 19 0
99 EM* GGR 117 Be* 22 55 12.3425612520 +59 07 45.406521624   14.03   12.63   B0Ve 10 0
100 EM* GGR 134 Be* 23 10 47.5107465648 +60 31 52.932410364   12.53 11.766     B0Ve 14 0
101 BD+60 2584 Be* 23 35 41.4970010424 +61 11 19.331282832 10.25 10.78 10.3     O 28 0

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