2019ApJ...885..147K


Query : 2019ApJ...885..147K

2019ApJ...885..147K - Astrophys. J., 885, 147-147 (2019/November-2)

Prevalence of SED turndown among classical be stars: are all be stars close binaries?

KLEMENT R., CARCIOFI A.C., RIVINIUS T., IGNACE R., MATTHEWS L.D., TORSTENSSON K., GIES D., VIEIRA R.G., RICHARDSON N.D., DOMICIANO DE SOUZA A., BJORKMAN J.E., HALLINAN G., FAES D.M., MOTA B., GULLINGSRUD A.D., DE BREUCK C., KERVELLA P., CURE M. and GUNAWAN D.

Abstract (from CDS):

Rapid rotation is a fundamental characteristic of classical Be stars and a crucial property allowing for the formation of their circumstellar disks. Past evolution in a mass and angular momentum transferring binary system offers a plausible solution to how Be stars attained their fast rotation. Although the subdwarf remnants of mass donors in such systems should exist in abundance, only a few have been confirmed due to tight observational constraints. An indirect method of detecting otherwise hidden companions is offered by their effect on the outer parts of Be star disks, which are expected to be disrupted or truncated. In the context of the infrared and radio continuum excess radiation originating in the disk, the disk truncation can be revealed by a turndown in the spectral energy distribution due to reduced radio flux levels. In this work, we search for signs of spectral turndown in a sample of 57 classical Be stars with radio data, which include new data for 23 stars and the longest-wavelength detections so far (λ ≃ 10 cm) for two stars. We confidently detect the turndown for all 26 stars with sufficient data coverage (20 of which are not known to have close binary companions). For the remaining 31 stars, the data are inconclusive as to whether the turndown is present or not. The analysis suggests that many if not all Be stars have close companions influencing their outer disks. If confirmed to be subdwarf companions, the mass transfer spin-up scenario might explain the existence of the vast majority of classical Be stars.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Be stars - Circumstellar disks - Binary stars - Radio continuum emission - Early-type emission stars - Stellar rotation - Stellar evolution - Infrared excess - Stellar astronomy - Circumstellar matter - Radio astronomy - Subdwarf stars

Simbad objects: 78

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Number of rows : 78
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 * omi Cas Be* 00 44 43.5186650 +48 17 03.713573 3.91 4.44 4.50 4.45 4.50 B5IIIe 275 0
2 * gam Cas Be* 00 56 42.5317 +60 43 00.265 1.18 2.29 2.39 2.32 2.40 B0.5IVpe 1170 2
3 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2691 2
4 * alf Eri Be* 01 37 42.84548 -57 14 12.3101 -0.36 0.30 0.46 0.49 0.60 B6Vpe 457 0
5 * phi Per Be* 01 43 39.6379209 +50 41 19.432832 3.10 4.02 4.06 3.90 3.88 B1.5V:e-shell 551 0
6 * psi Per Be* 03 36 29.3798227 +48 11 33.478941 3.60 4.17 4.23     B5Ve 403 0
7 * 17 Tau Be* 03 44 52.5368818 +24 06 48.011217 3.19 3.59 3.70 3.71 3.80 B6IIIe 390 1
8 * eta Tau Be* 03 47 29.0765529 +24 06 18.488347 2.44 2.78 2.87 2.84 2.88 B7III 524 1
9 * c Per Be* 04 08 39.6921578 +47 42 45.042937 3.45 4.00 4.03 3.91 3.93 B3Ve 373 0
10 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 901 1
11 * 228 Eri Be* 04 29 06.9254098152 -13 02 54.127769208 4.45 5.23 5.41 5.46 5.63 B2(V)ne 271 0
12 * 11 Cam Be* 05 06 08.4527318736 +58 58 20.543222820 4.31 5.00 5.08     B3Ve 205 0
13 * 105 Tau Be* 05 07 55.4349577176 +21 42 17.349368184 5.51 6.08 5.92     B2Ve 170 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16153 1
15 * psi01 Ori Be* 05 24 44.8273848312 +01 50 47.201915688 3.83 4.76 4.96 5.04 5.26 B1Vn 337 0
16 * zet Tau Be* 05 37 38.6854231 +21 08 33.158804 2.22 2.84 3.03 3.06 3.15 B1IVe_shell 711 0
17 * ome Ori Be* 05 39 11.1463172 +04 07 17.279475 3.73 4.48 4.59 4.57 4.67 B3Ve 398 1
18 * alf Col Be* 05 39 38.9410319 -34 04 26.794991 2.10 2.53 2.65 2.65 2.74 B9Ve 233 0
19 NVSS J055932+235354 Rad 05 59 32.03313165 +23 53 53.9267683           ~ 45 1
20 HD 41335 Be* 06 04 13.5003372120 -06 42 32.225392980 4.31 5.14 5.21 5.13 5.09 B1V 284 0
21 HD 42054 Em* 06 07 03.6694879368 -34 18 43.279841124 5.14 5.709 5.836     B5Ve 67 0
22 QSO B0605-0834 BLL 06 07 59.6994046176 -08 34 49.980131256     18.5 17.70   ~ 422 1
23 * f01 Ori Be* 06 12 03.2795497 +16 07 49.461443 4.21 4.80 4.92 4.94 5.08 B5Vn 119 0
24 HD 43544 Be* 06 16 07.6914321072 -16 37 04.823463504 4.98 5.75 5.91 5.95 6.08 B2/B3Ve 76 0
25 * bet Mon ** 06 28 49.06971 -07 01 59.0101 2.85 3.59 3.74 3.75 3.91 B4Ve+B2Vn(e)+B3V:nne 222 0
26 * bet Mon A Be* 06 28 49.0704018024 -07 01 59.013827328 3.87 4.50 4.60     B4Veshell 242 0
27 * bet Mon B * 06 28 49.4226039089 -07 02 03.840805418   4.81 5.00     B2Vn(e) 65 0
28 * bet Mon C Em* 06 28 49.6129675416 -07 02 04.752049668   5.21 5.32     B3V:nne 61 0
29 * kap CMa Be* 06 49 50.4593263 -32 30 30.522482 2.73 3.68 3.89 3.91 4.05 B1.5Ve 277 0
30 V* HZ CMa Be* 06 50 23.3482557912 -31 42 21.808309320   5.829 5.747     B6IVe+A 85 0
31 HD 55606 Be* 07 13 34.1003415384 -02 04 39.100526796 8.28 9.01 9.04     B0.5Vnnpe 45 0
32 * ome CMa Be* 07 14 48.6538664 -26 46 21.609714 2.90 3.64 3.82 3.80 3.90 B2.5Ve 341 0
33 HD 58978 Be* 07 26 59.4826856664 -23 05 09.689679528 4.51 5.45 5.56 7.05   B0.5IVe 221 0
34 * bet CMi Be* 07 27 09.0417373 +08 17 21.536745 2.52 2.80 2.89 2.90 2.96 B8Ve 370 0
35 * z Pup Be* 07 33 51.0415389912 -36 20 18.212736408 4.67 5.37 5.44 5.33 5.32 B2Vne 121 0
36 QSO B0742+103 QSO 07 45 33.05952141 +10 11 12.6923363       23.72   ~ 186 1
37 * omi Pup Be* 07 48 05.1683937 -25 56 13.812276 3.42 4.43 4.49 4.37 4.37 B1IVe 205 0
38 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2182 1
39 * p Car Be* 10 32 01.4629679 -61 41 07.196308 2.46 3.18 3.27 3.22 3.28 B4Vne 226 0
40 * del Cen Be* 12 08 21.4976373 -50 43 20.738614 1.51 2.39 2.52 2.48 2.62 B2Vne 301 0
41 * kap Dra Be* 12 33 28.9433168544 +69 47 17.659892220 3.18 3.75 3.89 3.84 3.92 B6IIIe 364 0
42 * lam Cru Be* 12 54 39.1825757 -59 08 48.122859 3.86 4.451 4.602     B3Vne 134 1
43 3C 279 Bla 12 56 11.1663795384 -05 47 21.528432492   18.01 17.75 15.87   ~ 2888 2
44 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4092 2
45 * mu. Cen Be* 13 49 36.9886294 -42 28 25.429594 2.37 3.27 3.43 3.41 3.50 B2Vnpe 423 0
46 * eta Cen Be* 14 35 30.4241610 -42 09 28.170782 1.30 2.12 2.31 2.41 2.59 B2Ve 330 0
47 * tet Cir Be* 14 56 43.9873836 -62 46 51.657921 4.34 5.11 5.11 4.87 4.79 B2III 104 0
48 * mu. Lup Be* 15 18 32.02296 -47 52 30.9957 3.82         B8Ve 96 0
49 PKS 1540-077 rG 15 43 01.6870313616 -07 57 06.636559464   18       ~ 34 1
50 * 48 Lib Be* 15 58 11.3682502453 -14 16 45.681109093 4.61 4.77 4.87 4.91 4.96 B5IIIp_sh 432 0
51 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 720 0
52 * chi Oph Be* 16 27 01.4355697915 -18 27 22.499961252 3.95 4.71 4.43 3.97 3.73 B2Vne 580 0
53 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1785 2
54 HD 153261 Be* 17 01 47.3879360496 -58 57 29.691162864 5.1 6.08 6.11     B2IVne 84 0
55 * iot Ara Be* 17 23 16.0762402440 -47 28 05.505681720 4.32 5.14 5.25 5.12 5.20 B1V 140 0
56 * alf Ara Be* 17 31 50.4915282 -49 52 34.122041 2.09 2.78 2.95 3.05 3.29 B2Vne 250 0
57 HD 161306 Be* 17 45 07.7041298136 -09 48 54.445589568 8.35 8.78 8.30     B3/5Vnne 54 0
58 * 66 Oph Be* 18 00 15.7982457 +04 22 07.016285 3.77 4.58 4.60 4.47 4.49 B2Ve 335 0
59 QSO B1801+010 QSO 18 04 15.9844623720 +01 01 32.407105836     19.00 17.32   ~ 78 1
60 HD 174237 Be* 18 46 43.0891606728 +52 59 16.654686648 5.06 5.80 5.90     B3+F5III 198 0
61 3C 391.0 Rad 18 49 23.3 -00 55 38           ~ 337 2
62 * bet Lyr EB* 18 50 04.7952472 +33 21 45.609978 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 906 0
63 * 2 Vul Pu* 19 17 43.6353905520 +23 01 31.941802308 4.64 5.43 5.43     B3IV+ 134 1
64 * b02 Cyg Be* 20 09 25.6190611128 +36 50 22.633958400 4.03 4.80 4.93     B2.5Ve 256 0
65 HD 194335 Be* 20 23 44.3690462664 +37 28 35.209455780 4.82 5.70 5.90     B2IIIe 134 0
66 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 756 0
67 * f01 Cyg Be* 20 59 49.5541247496 +47 31 15.363746436 3.77 4.71 4.75 4.62 4.63 B1.5Vnne 479 0
68 * 60 Cyg Be* 21 01 10.9277453472 +46 09 20.795190696 4.23 5.226 5.432     B1Ve 186 0
69 QSO B2126-15 QSO 21 29 12.1759496520 -15 38 41.040389292   17.61 17.3 17.3   ~ 480 1
70 * eps Cap Be* 21 37 04.8306787 -19 27 57.646354 3.69 4.35 4.55 4.60 4.74 B3V 247 0
71 HD 208682 Be* 21 55 30.99976 +65 19 14.9142 5.05 5.80 5.86     B2Ve 123 1
72 * omi Aqr Be* 22 03 18.8440292 -02 09 19.306758 4.22 4.64 4.69 4.70 4.74 B5V 260 0
73 4C -03.79 QSO 22 18 52.0376984088 -03 35 36.879875124   16.93 16.38 16.15   ~ 325 1
74 * pi. Aqr Be* 22 25 16.6228499 +01 22 38.634579 3.64 4.60 4.64 4.48 4.48 B1III-IVe 398 0
75 HD 217050 Be* 22 57 04.5020619144 +48 41 02.645623680 4.81 5.34 5.43     B4IIIpe 321 1
76 * omi And Be* 23 01 55.2645930 +42 19 33.533383 3.00 3.53 3.62 3.61 3.69 B6IV/V_sh 419 0
77 * bet Psc Be* 23 03 52.6134921 +03 49 12.166213 3.90 4.40 4.52 4.54 4.67 B6Ve 244 0
78 * eps Tuc Be* 23 59 54.9776152 -65 34 37.680366 4.12 4.38 4.47 4.45 4.49 B8V 132 0

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2022.08.10-07:30:58

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