2012ApJ...753...13M

Query : 2012ApJ...753...13M

2012ApJ...753...13M - Astrophys. J., 753, 13 (2012/July-1)

A study of the role of Lyβ fluorescence on O I line strengths in Be stars.

MATHEW B., BANERJEE D.P.K., SUBRAMANIAM A. and ASHOK N.M.

Abstract (from CDS):

The possibility of the Lyβ fluorescence mechanism being operational in classical Be (CBe) stars and thereby contributing to the strength of the O I λ8446 line has been recognized for long. However, this supposition needs to be quantified by comparing observed and predicted O I line ratios. In the present work, optical and near-infrared spectra of CBe stars are presented. We analyze the observed strengths of the O I λ7774, λ8446, λ11287, and λ13165 lines, which have been theoretically proposed as diagnostics for identifying the excitation mechanism. We have considered and examined the effects of Lyβ fluorescence, collisional excitation, recombination, and continuum fluorescence on these O I line strengths. From our analysis it appears that the Lyβ fluorescence process is indeed operative in Be stars.

Abstract Copyright: ∼

Journal keyword(s): atomic processes - circumstellar matter - infrared: stars - line: formation - stars: emission-line, Be - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/ApJ/753/13): table1.dat>

Simbad objects: 94

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Number of rows : 94
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* GGA 25 Be* 01 15 20.2687079352 +58 50 02.921665056 13.46 13.69 13.29 13.19   B5-7Ve 11 0
2 Cl* NGC 436 BOD 13 Be* 01 15 58.399 +58 49 15.03   11.47 11.24 11.60   B3Ve 4 0
3 NGC 457 124 Be* 01 19 02.3624855904 +58 19 20.248805532 12.08 12.23 11.95     B3Ve 16 0
4 V* V1122 Cas Be* 01 33 15.1406544120 +60 41 00.064068900   9.95 9.712 9.75   B0-1Ve 21 0
5 EM* GGA 56 Be* 01 33 41.8971574752 +60 42 19.669410288   11.61 11.35     B2Ve 21 0
6 * phi Per Be* 01 43 39.6379691568 +50 41 19.433124998 3.10 4.02 4.06 3.90 3.88 B1.5V:e-shell 594 0
7 EM* GGA 83 Be* 01 44 02.9337640296 +61 53 20.341990608 14.51 14.19 13.49 12.14   B0-1e 16 0
8 V* V1146 Cas Be* 01 44 22.6800335184 +60 40 43.468134996   12.43 11.74     B1Ve 14 0
9 EM* GGA 86 Be* 01 44 33.1638773472 +60 40 56.425356696   13.31 12.70     B2Ve 14 0
10 BD+60 325 Be* 01 45 18.0279360312 +61 06 56.475940176   10.47 10.083 9.90   B1Ve 38 0
11 EM* GGA 94 Be* 01 45 39.6178888368 +61 12 59.122135152   13.16 12.451 12.09   B2Ve 33 0
12 EM* GGA 95 Be* 01 45 46.3956587112 +61 09 20.905824744   12.52 11.937 11.77   B1Ve 25 0
13 EM* GGA 97 Be* 01 45 56.1027684240 +61 12 45.286198560   12.05 12.008 11.58   B2Ve 37 0
14 NGC 663 84 Be* 01 46 02.0814816960 +61 15 02.099373516   14.74 13.96 13.92   B5Ve 22 0
15 EM* VES 616 Be* 01 46 06.1342275984 +61 13 39.204657012   12.06 11.509 11.35   B0-1Ve 29 0
16 EM* GGA 98 Be* 01 46 20.2301457288 +61 14 21.578249688   12.71 11.985 11.44   B2Ve 31 0
17 BD+60 341 Be* 01 46 26.8455772104 +61 07 41.714872860   11.30 10.665 10.20   B0-1Ve 47 0
18 NGC 663 6 Be* 01 46 30.6369797712 +61 14 29.228497476   12.89 12.085 11.66   B1Ve 34 0
19 EM* GGA 101 Be* 01 46 35.6086307160 +61 13 39.084655008   12.34 12.311     B1Ve 33 0
20 NGC 663 124 Be* 01 47 03.7497404040 +61 17 32.049000312     12.281 12.07   B2Ve 26 0
21 EM* GGA 108 Be* 01 47 26.7678254136 +61 08 44.133943920   12.11 11.53     B0-1Ve 35 0
22 EM* GGA 109 Be* 01 47 39.3759246120 +61 18 20.557961964   13.12 12.383     B1Ve 24 0
23 * 2 Per SB* 01 52 09.3723086736 +50 47 34.054111608 5.38 5.623 5.689     B9pHgMn 99 0
24 * g Per * 02 02 18.1084057296 +54 29 15.145135980 4.64 4.96 5.04 5.01 5.06 B8III 107 0
25 HD 12856 Be* 02 07 53.4202382448 +57 06 20.474962308 8.01 8.75 8.60     B0pe 75 0
26 BD+56 529 Be* 02 19 13.6735270416 +57 07 43.570965000 10.24 10.59 10.2290   8.6693 B1Ve 47 0
27 BD+56 534 Be* 02 19 26.5189897464 +57 04 42.137892840 9.55 10.02 9.5590 9.53   B3Ve 45 1
28 NGC 869 1278 Be* 02 19 28.8928804896 +57 11 24.266861736     11.6848   11.1321 B0-1Ve 20 0
29 BD+56 563 Be* 02 21 43.3997996592 +57 07 32.801871180 9.12 9.77 8.4704   7.9688 B1IIIe 73 0
30 BD+56 573 Be* 02 22 06.4431258264 +57 05 25.031082120 9.47 10.06 9.66     B2III-IVe 73 0
31 EM* MWC 711 Be* 02 22 48.1059256776 +57 12 00.858864060   10.89 10.443     B0/1Ve 33 0
32 EM* AS 63 Be* 02 33 10.5550227552 +57 32 54.104521128 12.25 11.79 11.218     B0-1Ve 25 0
33 HD 17086 V* 02 47 09.6754593168 +60 34 14.747500992   7.036 6.525     A5+II 36 0
34 HD 19243 Be* 03 08 54.1761981696 +62 23 04.549808184 7.778 6.719 6.498     B1V:e 102 0
35 Cl* NGC 1220 OCC 25 Be* 03 11 40.9339699488 +53 21 03.640497408   14.491 13.798 13.51   B5Ve 6 0
36 HD 34095 * 05 16 28.9621442328 +36 04 18.578278740   7.38 7.22     A2 13 0
37 NGC 1893 35 Be* 05 22 43.0138065288 +33 25 05.419907184 14.04 14.24 13.585   12.376 B1Ve 28 0
38 HD 35345 Be* 05 25 44.7841496160 +35 38 49.911807948 7.86 8.54 8.43     B1Vpe 62 0
39 * bet Mon A Be* 06 28 49.0704018024 -07 01 59.013827328 3.87 4.50 4.60     B4Veshell 253 0
40 * bet Mon C Em* 06 28 49.6129675416 -07 02 04.752049668   5.21 5.32     B3V:nne 64 0
41 HD 45901 Be* 06 30 17.6286953544 +02 50 52.417316040 8.47 9.12 8.87     B0-1Ve 51 0
42 HD 49147 Be* 06 46 39.0161015760 -10 06 26.495075592   5.605 5.646     A0IIIe 59 0
43 UCAC2 27055464 Be* 07 08 12.5187097920 -13 09 55.489968936   13.93 13.19 13.35   B5Ve 6 0
44 NGC 2345 27 Be* 07 08 16.1553005976 -13 10 03.256707144   14.29 13.66     B3Ve 7 0
45 NGC 2345 59 Be* 07 08 28.0347737328 -13 15 35.283090708   13.44 13.05     B3Ve 8 0
46 LS 520 Be* 07 33 20.4160568904 -15 27 06.842739456 11.59 12.21 11.80 11.70   B1Ve 16 0
47 NGC 2421 1 Be* 07 36 06.6323199312 -20 37 55.735437036 11.32 11.59 11.30 11.49   B1Ve 18 0
48 V* V574 Pup No* 07 41 53.5879413696 -27 06 37.894596372   18.2 17.9     ~ 55 0
49 * eta Car s*b 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2543 0
50 * chi Oph Be* 16 27 01.4355697915 -18 27 22.499961252 3.95 4.71 4.43 3.97 3.73 B2Vne 624 0
51 V* V1280 Sco No* 16 57 41.2185889117 -32 20 35.700757833           ~ 110 0
52 V* V4643 Sgr No* 17 54 40.4172408408 -26 14 15.498092040   17.4       ~ 47 0
53 UCAC2 28238232 Be* 18 33 12.4181474784 -10 25 13.709418204   15.20 14.06 14.16   B2Ve 8 0
54 NGC 6649 9 Be* 18 33 28.3004329272 -10 24 08.756967024   12.98 11.76 10.6   B0Ve 26 0
55 NGC 6649 65 Be* 18 33 34.1325258888 -10 26 05.198674596   16.21 14.92 14.64   B5Ve 8 0
56 NGC 6834 55 Be* 19 52 06.4837098960 +29 24 37.675429884   13.80 13.21     B5Ve 9 0
57 NGC 6834 67 Be* 19 52 09.5310520896 +29 23 34.040105304     10.7     B1Ve 8 0
58 HD 333424 Be* 20 04 47.0954847624 +29 10 00.718954968   11.87 11.10 10.585   B0Ve 20 0
59 IC 4996 23 Be* 20 16 29.0778948768 +37 38 52.146900996 12.13 11.36 11.03     B3e 10 0
60 Cl Berkeley 86 28 Be* 20 20 20.2756471464 +38 37 39.249176340   14.55 12.69     B1Ve 4 0
61 EM* AS 407 Be* 20 21 28.3634733024 +37 26 19.987314072   16.05 14.228 13.79   B2e 17 0
62 EM* MWC 1015 Be* 20 21 33.5822468448 +37 24 51.700205016 13.75 13.28 11.84     B1.5Ve 61 1
63 UCAC3 274-184438 Be* 20 35 41.5154917728 +46 46 49.533103380   13.78 12.85 12.28   B0Ve 8 0
64 EM* UHA 141 Be* 21 11 00.9469863936 +45 39 41.324822496   15 13     B1-3Ve 9 0
65 V* V1500 Cyg No* 21 11 36.5809818696 +48 09 01.952490204           ~ 820 0
66 V* V2353 Cyg Be* 21 44 02.9701222392 +53 42 11.822590584       13.09   B1Ve 11 0
67 EM* GGR 50 Be* 22 12 19.6422959976 +57 16 05.386714500 12.73 13.00 12.20 12.02   B0-1Ve 17 0
68 ATO J334.9643+58.1481 Be* 22 19 51.4517536440 +58 08 53.468826072   13.80 12.68 12.61   B0Ve 11 0
69 EM* GGR 63 Be* 22 20 10.1058633840 +58 06 34.372077732   14.09 13.46 13.27   B1Ve 7 0
70 ZTF J222013.11+580742.6 Be* 22 20 13.1210215536 +58 07 42.656251800   13.58 12.82 12.51   B0-1Ve 10 0
71 UCAC4 741-086760 Be* 22 47 40.1198644464 +58 09 03.661770384     13.678 13.517 12.702 B1-3Ve 8 0
72 BD+57 2615 Be* 22 47 49.5706150416 +58 08 49.516370232   10.44 10.14     B1-3Ve 73 0
73 Cl* NGC 7419 BMD 232 Be* 22 54 07.0513495392 +60 48 17.464423248   18.861 16.642     B8Ve 11 0
74 HBHA 6206-14 Be* 22 54 07.5737115528 +60 50 22.636653000   17.306 15.056 14.78   B0Ve 18 0
75 EM* GGR 112 Be* 22 54 14.4117992736 +60 48 39.439218240   15.45 13.79 13.25   B0Ve 13 0
76 UCAC3 302-169339 Be* 22 54 14.8320094536 +60 51 21.860585928   16.92 15.44 15.62   B1-3Ve 10 0
77 Cl* NGC 7419 BMD 417 Be* 22 54 15.3350647464 +60 49 50.191064436   15.820 14.055     B0Ve 14 0
78 Cl* NGC 7419 BMD 427 Be* 22 54 15.8478056298 +60 47 49.412145520   17.257 15.249 14.838   B2.5e 17 0
79 UCAC3 302-169354 Be* 22 54 17.8912802280 +60 48 57.216596832       14.77   B0Ve 8 0
80 [D75b] Em* 22-119 Be* 22 54 19.6244846784 +60 48 35.913106800   16.008 14.273     B0Ve 14 0
81 Cl* NGC 7419 BMD 620 Be* 22 54 20.4643372056 +60 49 51.949561440   16.048 14.184 13.99   B0Ve 15 0
82 EM* GGR 113 Be* 22 54 22.5972543096 +60 49 53.319620712   16.053 14.142 13.65   B0Ve 18 0
83 HBHA 6206-18 Be* 22 54 22.8707208768 +60 50 03.689272284   16.083 14.230 13.76   B0Ve 16 0
84 HBHA 6206-15 Be* 22 54 23.7119087808 +60 49 31.119290616   17.083 15.309     B1Ve 14 0
85 HBHA 6206-10 Be* 22 54 24.3045143232 +60 47 36.306548988   18.549 16.586     B6e 12 0
86 [D75b] Em* 22-120 Be* 22 54 27.1172301408 +60 48 52.178617152   16.615 14.815     B0Ve 14 0
87 HBHA 6206-07 Be* 22 54 29.2849804920 +60 49 08.162607828   17.528 15.771     B0Ve 14 0
88 [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
89 [D75b] Em* 22-123 Be* 22 54 53.1861185583 +59 09 32.634452971   14.21 13.13 12.81   B1Ve 9 0
90 [D75b] Em* 22-127 Be* 22 54 56.6841477744 +59 10 22.169362224   14.68 13.66 13.28   B3Ve 6 0
91 UCAC3 299-175354 Be* 22 55 06.4312688040 +59 13 09.159380256   15.42 14.45 14.12   B2Ve 5 0
92 EM* GGR 134 Be* 23 10 47.5107465648 +60 31 52.932410364   12.53 11.766     B0Ve 14 0
93 LS III +60 39 Be* 23 10 57.3670867056 +60 34 01.647932772   11.61 11.00     B0Ve 16 0
94 HBHA 6207-06 Be* 23 11 08.5315088280 +60 35 03.296895324     15.1 14.22   B1Ve 10 0

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