2020A&A...634A..18C


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET10:50:08

2020A&A...634A..18C - Astronomy and Astrophysics, volume 634A, 18-18 (2020/2-1)

Be and Bn stars: Balmer discontinuity and stellar-class relationship.

COCHETTI Y.R., ZOREC J., CIDALE L.S., ARIAS M.L., AIDELMAN Y., TORRES A.F., FREMAT Y. and GRANADA A.

Abstract (from CDS):

Context. A significant number of Be stars show a second Balmer discontinuity (sBD) attributed to an extended circumstellar envelope (CE). The fast rotational velocity of Be stars undoubtedly plays a significant role in the formation of the CE. However, Bn stars, which are also B-type rapidly rotating stars, do not all present clear evidence of being surrounded by circumstellar material. Aims. We aim to characterize the populations of Be and Bn stars, and discuss the appearance of the sBD as a function of the stellar parameters. We expect to find new indices characterizing the properties of CEs in Be stars and properties relating Be and Bn stars. Methods. We obtained low- and high-resolution spectra of a sample of Be and Bn stars, derived stellar parameters, characterized the sBD, and measured the emission in the Hα line. Results. Correlations of the aspect and intensity of the sBD and the emission in the Hα line with the stellar parameters and the Vsini are presented. Some Bn stars exhibit the sBD in absorption, which may indicate the presence of rather dense CEs. Six Bn stars show emission in the Hα line, so they are reclassified as Be stars. The sBD in emission appears in Be stars with Vsini≤250km/s, and in absorption in both Be and Bn stars with Vsini≥50km/s Low-mass Be and Bn stars share the same region in the Hertzsprung-Russell diagram. The distributions of rotational to critical velocity ratios of Be and Bn stars corresponding to the current stellar evolutionary stage are similar, while distributions inferred for the zero-age main sequence have different skewness.Conclusions. We found emission in the Hα line and signs of a CE in some Bn stars, which motivated us to think that Bn and Be stars probably belong to the same population. It should be noted that some of the most massive Bn stars could display the Be phenomenon at any time. The similarities found among Be and Bn stars deserve to be more deeply pursued.

Abstract Copyright: © ESO 2020

Journal keyword(s): circumstellar matter - stars: emission-line, Be - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/634/A18): tablea1.dat tablea2.dat tablea3.dat tablea4.dat tablea5.dat tablea6.dat tablea7.dat tablea8.dat tablea9.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 128

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Number of rows : 128

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * 2 Cet * 00 03 44.3878420 -17 20 09.571938 4.4 4.483 4.536   4.58 B9IVn 105 0
2 * 34 Psc * 00 10 02.2026446215 +11 08 44.925917994   5.456 5.530   5.58 B9Vn 126 0
3 HD 5617 * 00 57 37.7603424009 -18 59 55.043274110   6.99 6.90     A2V 18 1
4 * alf Eri Be* 01 37 42.84548 -57 14 12.3101 -0.36 0.30 0.46 0.49 0.60 B6Vpe 446 0
5 HD 10161 * 01 38 49.9948774240 -25 01 19.908388603   6.606 6.689     B9V 45 0
6 HD 10894 * 01 47 09.1068247893 +10 50 39.264908960 6.910 7.020 7.050     B9 26 0
7 * rho Cet * 02 25 57.0060377624 -12 17 25.697269517   4.841 4.866     A0V 106 0
8 * del Cet bC* 02 39 28.95579 +00 19 42.6345 2.97 3.85 4.07     B2IV 367 0
9 HD 18331 PM* 02 56 37.4250931011 -03 42 44.356726847 5.280 5.250 5.160     A1V 146 0
10 HD 18546 * 02 57 32.6271907439 -38 11 27.322031434   6.383 6.411     A0Vn 20 0
11 * ksi Tau EB* 03 27 10.1384893130 +09 43 57.862146153 3.33 3.66 3.75 3.76 3.85 B9Vn 180 0
12 * 13 Tau Be* 03 42 18.9478060134 +19 42 00.925169042 5.41 5.68 5.69     B9Vne 93 0
13 HD 24817 PM* 03 57 01.7180297619 +06 02 23.889249469   6.138 6.072     A0Vn 42 0
14 HD 26676 *iN 04 13 34.5675817044 +10 12 44.933150307   6.268 6.249     B8V 93 1
15 HD 26793 * 04 14 36.2319792954 +10 00 41.074718312   5.118 5.218     B9Vn 56 0
16 HD 28248 * 04 24 06.9032546834 -57 15 11.378700436   7.60 7.52     B3V 13 0
17 * 228 Eri Be* 04 29 06.9257908165 -13 02 54.131950447 4.45 5.23 5.41 5.46 5.63 B2(V)ne 268 0
18 * 56 Eri Be* 04 44 05.3208488091 -08 30 12.847764696 4.97 5.75 5.81 5.72 5.74 B2(V)nne 174 0
19 * pi.02 Ori * 04 50 36.7229825 +08 54 00.649333 4.39 4.36 4.35 4.29 4.29 A1Vn 164 0
20 HD 31093 ** 04 51 28.2164423 -34 54 22.634070   5.932 5.833     A2/3V 49 1
21 HD 31209 * 04 53 55.8055070901 +01 34 09.732035054   6.639 6.605     A0III/IV 34 0
22 HD 32039 * 05 00 32.5353820092 +03 36 53.212941654 6.740 6.970 7.020     B9V 44 0
23 HD 32040 V* 05 00 33.9355074660 +03 36 56.816516012 6.220 6.550 6.630     B9V 59 0
24 HD 32309 * 05 01 25.5811681311 -20 03 06.905378229   4.838 4.885     B9V 72 0
25 HD 34748 * 05 19 35.2871385027 -01 24 42.883217010 5.50 6.24 6.35 6.34 6.48 B3V 87 0
26 * nu. Lep * 05 19 59.0235505082 -12 18 56.105730220 4.76 5.169 5.284     B7/8V 62 0
27 HD 35165 Be* 05 21 16.8600821608 -34 20 42.172024321 5.24 5.90 6.09 6.12 6.26 B2Vnpe 66 1
28 * eta Ori Al* 05 24 28.61672 -02 23 49.7311 2.25 3.18 3.35 3.44 3.65 B1V+B2: 381 0
29 HD 35407 * 05 24 36.1024132139 +02 21 11.392152980 5.54 6.159 6.297     B3V 79 0
30 * gam Ori V* 05 25 07.86325 +06 20 58.9318 0.54 1.42 1.64 1.73 1.95 B2V 501 1
31 HD 35640 * 05 26 02.3630840389 -05 31 06.613367784   6.186 6.233     B8/9V 57 0
32 HD 35656 * 05 26 38.8297427821 +06 52 07.172034730   6.387 6.399   6.41 B9V 39 0
33 HD 36012 Be* 05 28 48.4570334857 +02 09 52.977908367   7.14 7.24     B2Vne 51 0
34 HD 36058 ** 05 28 56.9094875 -03 18 26.744410   6.380 6.382     B9V 52 1
35 * lam Ori A Em* 05 35 08.2792540686 +09 56 02.955355445 2.17 3.48 3.47     O8III((f)) 487 0
36 * ome Ori Be* 05 39 11.1463172 +04 07 17.279475 3.73 4.48 4.59 4.57 4.67 B3Ve 390 1
37 HD 37971 Be* 05 41 41.5106101927 -16 43 32.979361027   6.065 6.200     B4/5III 40 0
38 HD 42327 * 06 09 20.1980945809 -18 07 34.988220950   6.312 6.359     B9V(n) 27 0
39 HD 43445 * 06 15 44.8861069041 -13 43 06.279393570   4.915 5.001     B9V 55 0
40 HD 256577 Be* 06 24 00.1787465514 +08 18 02.496782051 8.86 9.79 9.77     B1V 35 0
41 HD 44783 * 06 24 02.2831068327 +08 53 06.052272442   6.155 6.219     B8Vn 40 0
42 HD 44996 Be* 06 24 20.5774702763 -12 57 42.953951644 5.41 6.04 6.12     B2.5Ve 63 0
43 HD 45380 * 06 26 44.8516980664 -07 30 42.980412696   6.29 6.33     B9V 45 0
44 HD 45871 Be* 06 28 39.24252 -32 22 16.5985 4.92 5.57 5.74     B3Ve 51 0
45 HD 47054 Be* 06 36 35.3296957645 -05 12 40.100498706 5.05 5.44 5.52     B8IVe 93 0
46 HD 49131 Be* 06 45 31.1886574836 -30 56 56.326766828 4.48 5.55 5.68 7.15   B1.5Vne 69 0
47 * eps CMa * 06 58 37.54876 -28 58 19.5102 0.36 1.29 1.50 1.59 1.80 B1.5II 464 1
48 * ome CMa Be* 07 14 48.6538664 -26 46 21.609714 2.90 3.64 3.82 3.80 3.90 B2.5Ve 331 0
49 * ups01 Pup Be* 07 18 18.3933493 -36 44 02.232922 3.78 4.57 4.67 4.57 4.62 B2V+B3IVne 141 0
50 HD 58155 Be* 07 23 00.6973664828 -31 55 25.602326421 4.60 5.28 5.43     B3V 70 0
51 HD 58343 Be* 07 24 40.1874154193 -16 12 05.299273325 4.52 5.15 5.19 5.05 5.06 B2Vne 202 0
52 * z Pup Be* 07 33 51.0420559079 -36 20 18.207070870 4.67 5.37 5.44 5.33 5.32 B2Vne 119 0
53 HD 61224 Be* 07 37 38.8013059879 -14 26 26.743363583 6.22 6.491 6.516     B8/9IV 58 0
54 HD 66194 Be* 07 58 50.5509056292 -60 49 28.055349036 4.92 5.72 5.81 5.77 5.83 B3Vn 121 0
55 HD 65875 Be* 08 00 44.1334580605 -02 52 54.909780550 5.68 6.49 6.59 6.48 6.50 B2.5Ve 129 0
56 HD 71072 Be* 08 25 00.3966258428 -12 45 53.222278078   6.75 6.85     B4III/IV 33 0
57 * E Car Be* 09 05 38.3726704575 -70 32 18.583230443 3.75 4.500 4.652     B2(IV)n 89 0
58 * phi Vel * 09 56 51.7416742 -54 34 04.039043 2.81 3.35 3.45 3.51 3.59 B5Ib 122 0
59 HD 88825 Be* 10 13 01.1468037582 -59 55 05.108724839 5.54 5.997 6.087     B5(III)e 56 0
60 * ome Car Be* 10 13 44.2173938 -70 02 16.456305 2.92 3.25 3.33 3.29 3.32 B8IIIe 111 0
61 HD 89884 Be* 10 21 59.4008761135 -18 02 04.126551388 6.45 7.01 7.13     B5III 50 0
62 HD 90490 Be* 10 25 16.1872829904 -58 52 20.857180172 6.36 6.901 7.003     B5Vne 21 0
63 HD 91120 Be* 10 30 59.8371633549 -13 35 18.495396994 5.38 5.54 5.58     B8/9IV/V 99 0
64 * p Car Be* 10 32 01.4629679 -61 41 07.196308 2.46 3.18 3.27 3.22 3.28 B4Vne 222 0
65 * j Cen Be* 11 49 41.0574493666 -63 47 18.429857100 3.58 4.160 4.308     B3V 106 0
66 HD 124367 Be* 14 14 57.1404303053 -57 05 10.058117811 4.36 4.99 5.07     B4Vne 133 0
67 HD 127449 Be* 14 33 36.7747558058 -58 49 14.878423825   7.70 7.71     B2/3Vn 21 0
68 * tet Cir Be* 14 56 43.9873836 -62 46 51.657921 4.34 5.11 5.11 4.87 4.79 B2IV/V 102 0
69 * mu. Lup Be* 15 18 32.02296 -47 52 30.9957 3.82         B8Ve 95 0
70 * kap01 Aps Be* 15 31 30.8205174186 -73 23 22.534139337 4.60 5.37 5.49     B2Vnpe 105 0
71 * d Lup Be* 15 35 53.24806 -44 57 30.1982 3.68     6.70   B3V 112 0
72 HD 142184 Be* 15 53 55.86404 -23 58 41.1522 4.77 5.352 5.402     B2V 202 0
73 * 48 Lib Be* 15 58 11.3686950 -14 16 45.689426 4.61 4.77 4.87 4.91 4.96 B5IIIp_sh 427 0
74 * 8 Her * 16 08 46.6313265499 +17 12 20.291442872   6.118 6.127     A0Vnn 41 0
75 HD 148259 Be* 16 28 49.8875992609 -44 48 45.421211135 6.98 7.54 7.42     B2II 46 0
76 HD 149485 * 16 38 52.6868631898 -60 59 25.472749331   6.071 6.150     B7Vn 29 0
77 HD 154243 Be* 17 05 52.8453984515 -36 35 17.495579223 7.7 8.28 8.08 8.88   B3Vnne 27 0
78 HD 155436 Be* 17 13 43.7608928372 -44 43 45.170832556 9.78 10.06 9.38 9.55   B2/3 19 0
79 * del Ara PM* 17 31 05.9127207 -60 41 01.852144 3.21 3.52 3.62     B8Vn 85 0
80 HD 159358 * 17 34 46.3502618113 -11 14 31.195370047   5.540 5.535     B9V 61 0
81 * 79 Her ** 17 37 31.1117271215 +24 18 36.013169984 5.930 5.900 5.760     A2Vn 53 0
82 * 68 Oph ** 18 01 45.1988377 +01 18 18.277526   4.453 4.429     A0.5Van 142 0
83 * 97 Her * 18 02 30.1530863774 +22 55 23.600420503   6.111 6.211     B3Vn 35 0
84 HD 165910 * 18 07 48.3530974435 +13 04 15.997797218   6.651 6.597     A2Vn 28 0
85 * 102 Her * 18 08 45.4914189 +20 48 52.407870 3.38 4.177 4.347     B2IV 177 0
86 HD 166566 Be* 18 11 50.9094867980 -15 40 47.485305110 7.53 8.19 8.01 8.80   B2Ve 53 1
87 HD 168905 V* 18 24 18.2414849011 -44 06 36.900838540   5.063 5.227     B3V 59 0
88 HD 171054 Be* 18 33 08.6713081679 -13 54 43.469843200 8.51 9.22 9.14     B2Ve 34 0
89 HD 171149 * 18 33 22.7082277906 -05 54 42.188230336   6.381 6.354     B9V 44 0
90 HD 171623 ** 18 35 12.5989619673 +18 12 12.332222703 5.670 5.780 5.790     A0Vn 45 0
91 * lam CrA PM* 18 43 46.9414349214 -38 19 24.394057537   5.180 5.111     A0/1V 36 0
92 HD 176304 * 18 59 17.3413620954 +10 08 27.606048527 6.57 7.00 6.75     B2Vp 59 0
93 * zet Aql PM* 19 05 24.6080155 +13 51 48.518212 2.99 3.00 2.99 2.98 2.98 A0IV-Vnn 324 0
94 * lam Aql PM* 19 06 14.9397099975 -04 52 57.231496924 3.07 3.34 3.43 3.46 3.55 B8.5V 208 0
95 HD 178744 * 19 09 51.5957402318 -00 25 41.207776218   6.281 6.321     B7IV 33 0
96 HD 179648 * 19 12 36.7331258166 +21 33 16.460147956 6.190 6.110 6.040     A2Vn 31 0
97 HD 180782 * 19 17 48.1919722205 +02 01 54.244559010   6.195 6.174     A0V 32 0
98 HD 180183 * 19 18 41.5430960842 -56 08 40.894648888 5.90 6.66 6.82     B2V 44 0
99 * eta Tel PM* 19 22 51.2064652963 -54 25 26.152538950   5.035 5.020   4.99 A0V+M7/8V 192 0
100 HD 182180 * 19 24 30.1796083175 -27 51 57.396699026 5.22 5.889 6.011     B2Vnn 94 0
101 HD 182645 * 19 26 11.0426934365 -15 03 11.705864474   5.703 5.706     B7IV 36 0
102 * 7 Vul Be* 19 29 20.8974228546 +20 16 47.058311388   6.226 6.326     B5Vn 46 1
103 * 9 Vul V* 19 34 34.8959424875 +19 46 24.237109192 4.48 4.91 5.00 5.01 5.10 B8IIIn 88 1
104 HD 187567 Be* 19 50 17.4789720907 +07 54 08.694058765 5.71 6.389 6.478     B2IVe 95 0
105 * 12 Vul Be* 19 51 04.1087903864 +22 36 36.165889039 4.15 4.84 4.96 4.98 5.12 B2.5Ve 178 0
106 * 57 Aql A * 19 54 37.6522492410 -08 13 38.244911253   5.63 5.71     B7Vn 66 0
107 * 65 Sgr * 20 05 26.3353833148 -12 39 54.594552862   6.59 6.53     A0V 26 0
108 * 20 Vul Be* 20 12 00.7017606281 +26 28 43.698928217 5.38 5.81 5.92     B7Ve 104 0
109 * 25 Vul Be* 20 22 03.4307625256 +24 26 45.952640844 5.06 5.45 5.56 5.59 5.58 B6IVe 99 0
110 HD 195922 * 20 33 53.7097409481 +10 03 35.116409480   6.625 6.536     A2Vnn 24 0
111 * bet Mic * 20 51 58.7618105311 -33 10 40.705762649   6.073 6.055     A1IV 20 0
112 HD 199280 * 20 56 18.2549004375 -03 33 42.096071539   6.480 6.564     B8IV 38 0
113 * eps Cap Be* 21 37 04.8306787 -19 27 57.646354 3.69 4.35 4.55 4.60 4.74 B3V 241 0
114 * 16 Peg Be* 21 53 03.7682618 +25 55 30.490138 4.24 4.921 5.081     B3Ve 160 0
115 HD 208321 * 21 56 22.7706404695 -37 15 13.159220864   5.518 5.443     A3V 27 0
116 * eta PsA Be* 22 00 50.22537 -28 27 13.4639 4.96         B8III_sh+B8.5IV 92 0
117 * omi Aqr Be* 22 03 18.8440292 -02 09 19.306758 4.22 4.64 4.69 4.70 4.74 B7IVe 255 0
118 HD 209522 Be* 22 04 36.7670935746 -26 49 20.492720775 5.16 5.793 5.953     B4IVe 87 0
119 * 25 Peg Be* 22 07 50.3036328703 +21 42 10.530347500 5.27 5.68 5.78     B7Vne 110 0
120 HD 210419 * 22 10 21.1079251 -03 53 38.713233   6.267 6.282     A0V 35 0
121 * 31 Peg Be* 22 21 31.0751048 +12 12 18.662815 4.08 4.89 4.99 5.06 5.20 B2IV-Ve 212 0
122 * eta Aqr PM* 22 35 21.38126 -00 07 02.9888 3.690 3.950 4.030 4.06 4.13 B8/9V 149 0
123 * 67 Aqr * 22 43 14.2626919164 -06 57 46.575229366   6.368 6.405     B7.5V 43 0
124 * bet Psc Be* 23 03 52.6134921 +03 49 12.166213 3.90 4.40 4.52 4.54 4.67 B6Ve 237 0
125 HD 218639 * 23 09 49.5500289867 -14 30 37.999526157   6.43 6.43     A0V 39 0
126 HD 219659 V* 23 17 40.0835439656 -11 42 46.614521613   6.378 6.327     A1/2IV/V 22 0
127 * i01 Aqr * 23 44 12.0785220231 -18 16 36.999934132   5.152 5.239     B9V 86 0
128 HD 223785 * 23 52 39.8811575714 -18 33 42.745829962   6.916 6.824     A1V 17 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-10:50:08

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