2023ApJ...948...34S

Query : 2023ApJ...948...34S

2023ApJ...948...34S - Astrophys. J., 948, 34 (2023/May-1)

Comparing Be Star Inclination Angles Determined from Hα Fitting and Gravitational Darkening.

SIGUT T.A.A. and GHAFOURIAN N.R.

Abstract (from CDS):

Using a sample of 92 Galactic Be stars, we compare inclination angles (the angle between a star's rotation axis and the line of sight) determined from Hα emission-line profile fitting to those determined by the spectroscopic signature of gravitational darkening. We find good agreement: 70% of the sample (64 out of 92 stars) is consistent with zero difference between the two methods using 1σ errors, and there is a strong linear correlation coefficient between the two methods of r = +0.63 ± 0.05. There is some evidence that the Hα profile fitting method overestimates the inclination angle for i ≲ 25°, perhaps due to the neglect of incoherent electron scattering on the Hα line widths, while the gravitational darkening method underestimates the inclination angle for i ≳ 70°, perhaps due to the neglect of disk radiative transfer effects on the optical spectrum. Overall, it is demonstrated that a single Hα spectrum of modest resolution and SNR can be used to extract a useful estimate for the inclination angle of an individual Be star. This allows equatorial rotation velocities for individual Be stars to be derived from $v\sin i$ measurements and will allow Be stars to be used to search for correlated spin axes in young, open clusters if unbiased (with respect to inclination) samples of Be stars are used.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Open star clusters - Stellar rotation - Be stars - Star formation - Early-type stars - Fundamental parameters of stars - Circumstellar disks

VizieR on-line data: <Available at CDS (J/ApJ/948/34): table1.dat>

Simbad objects: 97

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Number of rows : 97
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 * 10 Cas Be* 00 06 26.5373262768 +64 11 46.168691820 5.37 5.56 5.59     B9IIIe 118 0
2 * omi Cas Be* 00 44 43.5186007265 +48 17 03.731037403 3.91 4.44 4.50 4.45 4.50 B5IIIe 291 0
3 * gam Cas HXB 00 56 42.5310945 +60 43 00.264089 1.18 2.29 2.39 2.32 2.40 B0.5IVpe 1253 0
4 * phi And Be* 01 09 30.12562 +47 14 30.4594 3.84 4.18 4.25 4.22 4.27 B5IIIe 244 0
5 * alf Eri Be* 01 37 42.84548 -57 14 12.3101 -0.36 0.30 0.46 0.49 0.60 B6Vpe 495 1
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 HD 18552 Be* 03 00 11.8861086336 +38 07 54.197462964 5.67 6.05 6.11     B7IVe 94 0
8 HD 20336 Be* 03 19 59.2693390128 +65 39 08.285606820 3.93 4.70 4.85 4.88 5.01 B2.5Vn(e) 226 0
9 * psi Per Be* 03 36 29.3797327450 +48 11 33.484405927 3.60 4.17 4.23     B5Ve 431 0
10 HD 22780 Be* 03 41 07.8571995216 +37 34 48.707896728 5.09 5.50 5.57     B7Vn 101 0
11 * 13 Tau Be* 03 42 18.9476782488 +19 42 00.918475956 5.41 5.68 5.69     B7Ve 107 0
12 * 17 Tau Be* 03 44 52.5370897890 +24 06 48.016260072 3.19 3.59 3.70 3.71 3.80 B6IIIe 415 1
13 * 23 Tau Be* 03 46 19.5858871361 +23 56 54.092177220 3.70 4.12 4.18   4.16 B6IV(e) 446 2
14 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
15 * eta Tau Be* 03 47 29.0765529 +24 06 18.488347 2.44 2.78 2.87 2.84 2.88 B7III 557 1
16 HD 23552 Be* 03 48 18.0746021928 +50 44 12.357606372 5.88 6.20 6.14     B8V 93 0
17 * 28 Tau Be* 03 49 11.2165977912 +24 08 12.156712008 4.73 5.01 5.09   5.08 B8Vne 494 0
18 * c Per Be* 04 08 39.6935695869 +47 42 45.038007366 3.45 4.00 4.03 3.91 3.93 B3Ve 394 0
19 * 228 Eri Be* 04 29 06.9254098152 -13 02 54.127769208 4.45 5.23 5.41 5.46 5.63 B2(V)ne 286 0
20 * 11 Cam Be* 05 06 08.4527318736 +58 58 20.543222820 4.31 5.00 5.08     B3Ve 221 0
21 HD 33453 Be* 05 08 26.4547479576 -40 54 44.726323284   7.93 8.03     B8Vne 26 0
22 * psi01 Ori Be* 05 24 44.8273848312 +01 50 47.201915688 3.83 4.76 4.96 5.04 5.26 B1Vn 372 0
23 HD 36012 Be* 05 28 48.4569658824 +02 09 52.976615076   7.14 7.24     B2Vne 76 0
24 * 120 Tau Be* 05 33 31.6304227080 +18 32 24.827431848 4.94 5.70 5.69     B2IV-Ve 156 0
25 * ome Ori Be* 05 39 11.1457980782 +04 07 17.288290296 3.73 4.48 4.59 4.57 4.67 B3Ve 424 1
26 * alf Col Be* 05 39 38.9410319 -34 04 26.794991 2.10 2.53 2.65 2.65 2.74 B9Ve 251 0
27 HD 37967 Be* 05 43 19.5024321168 +23 12 15.748208100 5.51 6.15 6.21     B4Ve 112 0
28 HD 41335 Be* 06 04 13.5003372120 -06 42 32.225392980 4.31 5.14 5.21 5.13 5.09 B1V 314 0
29 NGC 2168 OpC 06 09 07.5 +24 20 15           ~ 604 0
30 * f01 Ori Be* 06 12 03.2799360825 +16 07 49.453623814 4.21 4.80 4.92 4.94 5.08 B5Vn 130 0
31 HD 43544 Be* 06 16 07.6914321072 -16 37 04.823463504 4.98 5.75 5.91 5.95 6.08 B2/B3Ve 94 0
32 HD 44996 Be* 06 24 20.5774906032 -12 57 42.963623424 5.41 6.04 6.12     B2.5Ve 77 0
33 HD 45871 Be* 06 28 39.24252 -32 22 16.5985 4.92 5.57 5.74     B3Ve 64 0
34 * nu. Gem Be* 06 28 57.7861342 +20 12 43.685624 3.51 4.00 4.14 4.17 4.28 B6IVe 269 0
35 HD 47054 Be* 06 36 35.3296522656 -05 12 40.103033112 5.05 5.44 5.52     B8IVe 108 0
36 * kap CMa Be* 06 49 50.4591124672 -32 30 30.523820933 2.73 3.68 3.89 3.91 4.05 B1.5Ve 298 0
37 * ome CMa Be* 07 14 48.6540133346 -26 46 21.603204215 2.90 3.64 3.82 3.80 3.90 B2.5Ve 373 0
38 HD 58050 Be* 07 24 27.6487438296 +15 31 01.908288624 5.39 6.23 6.41     B2Ve 138 0
39 HD 58343 Be* 07 24 40.1873324160 -16 12 05.302248804 4.52 5.15 5.19 5.05 5.06 B2Vne 222 0
40 * bet CMi Be* 07 27 09.0417373 +08 17 21.536745 2.52 2.80 2.89 2.90 2.96 B8Ve 400 0
41 * z Pup Be* 07 33 51.0415389912 -36 20 18.212736408 4.67 5.37 5.44 5.33 5.32 B2Vne 135 0
42 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
43 * r Pup Be* 08 13 29.5172754003 -35 53 58.265647773 3.68 4.66 4.77 4.68 4.77 B1V 199 0
44 HD 77320 Be* 09 00 22.2552895536 -43 10 26.376862224 5.16 5.93 6.08 6.07 6.19 B2Vnn(e) 98 1
45 * I Hya Be* 09 41 17.0067101149 -23 35 29.451517089 4.07 4.65 4.76 4.75 4.84 B5V 182 0
46 HD 86612 Be* 09 59 06.3044206872 -23 57 02.767063320 5.51 6.13 6.25 6.14 6.19 B5IVe 104 0
47 HD 88661 Be* 10 11 46.4595963216 -58 03 37.958712444 4.77 5.66 5.75 5.66 5.70 B5Vne 161 0
48 * ome Car Be* 10 13 44.2205948661 -70 02 16.463210640 2.92 3.25 3.33 3.29 3.32 B7III 129 0
49 HD 91120 Be* 10 30 59.8371178656 -13 35 18.495281472 5.38 5.54 5.58     B9IIIe 111 0
50 * p Car Be* 10 32 01.4650915230 -61 41 07.195030368 2.46 3.18 3.27 3.22 3.28 B4Vne 243 0
51 * del Cen Be* 12 08 21.4976373 -50 43 20.738614 1.51 2.39 2.52 2.48 2.62 B2Vne 320 0
52 HD 105521 Be* 12 08 54.5892904200 -41 13 53.771811240 4.87 5.402 5.498     B3IVe 87 0
53 * mu.02 Cru Be* 12 54 36.8841589536 -57 10 07.193918388 4.59 5.09 5.20 5.00 5.06 B5Vne 189 0
54 * mu. Cen Be* 13 49 36.9886872492 -42 28 25.440271450 2.37 3.27 3.43 3.41 3.50 B2Vnpe 453 0
55 HD 124367 Be* 14 14 57.1383087504 -57 05 10.049405532 4.36 4.99 5.07     B4Vne 153 0
56 * eta Cen Be* 14 35 30.4241610 -42 09 28.170782 1.30 2.12 2.31 2.41 2.59 B2Ve 361 1
57 * tet Cir Be* 14 56 43.9850523987 -62 46 51.675365388 4.34 5.11 5.11 4.87 4.79 B2III 120 0
58 * kap Lup Be* 15 11 56.0732718648 -48 44 16.169955108 3.55 3.67 3.70 3.75 3.76 B9.5Vne 105 0
59 * mu. Lup Be* 15 18 32.02296 -47 52 30.9957 3.82         B8Ve 112 0
60 * kap01 Aps Be* 15 31 30.8221293192 -73 23 22.529543604 4.60 5.37 5.49     B2Vnpe 126 0
61 * 4 Her Be* 15 55 30.5919435384 +42 33 58.291421364 5.23 5.64 5.75   5.82 B9pe 184 0
62 * chi Oph Be* 16 27 01.4355697915 -18 27 22.499961252 3.95 4.71 4.43 3.97 3.73 B2Vne 624 0
63 HD 156325 Be* 17 18 20.5104454512 -32 33 11.181878028 6.15 6.465 6.367     B6Vne 71 0
64 * iot Ara Be* 17 23 16.0762402440 -47 28 05.505681720 4.32 5.14 5.25 5.12 5.20 B1V 157 0
65 * alf Ara Be* 17 31 50.4915282 -49 52 34.122041 2.09 2.78 2.95 3.05 3.29 B2Vne 269 0
66 * z Her Be* 17 50 03.3345672768 +48 23 38.948985636 6.380 6.790 6.890     B6IIInp_sh 168 0
67 * 66 Oph Be* 18 00 15.7957050537 +04 22 07.122326765 3.77 4.58 4.60 4.47 4.49 B2Ve 358 0
68 HD 167128 Be* 18 17 07.5324253562 -56 01 24.057583523 4.62 5.30 5.36 5.32 5.36 B3IIIe 175 0
69 HD 171219 Be* 18 33 17.8360774464 +05 26 43.946946780   7.80 7.65     B8V 35 0
70 * 64 Ser Be* 18 57 16.5900397800 +02 32 07.245780324 5.29 5.545 5.551     B8/9II 114 0
71 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
72 * bet02 Cyg Be* 19 30 45.3961817904 +27 57 54.989118612 4.69 5.01 5.11     B8Ve 170 0
73 * 11 Cyg Be* 19 35 48.3043356552 +36 56 40.346673756 5.42 5.939 6.034     B8Vne 82 0
74 NGC 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0
75 * 12 Vul Be* 19 51 04.1083085616 +22 36 36.172997964 4.15 4.84 4.96 4.98 5.12 B2.5Ve 192 0
76 * 25 Cyg Be* 19 59 55.1953945704 +37 02 34.387660896 4.33 5.02 5.19     B3IVe 161 1
77 * b02 Cyg Be* 20 09 25.6190611128 +36 50 22.633958400 4.03 4.80 4.93     B2.5Ve 281 0
78 * 20 Vul Be* 20 12 00.7015131216 +26 28 43.703768388 5.38 5.81 5.92     B7Ve 115 0
79 * 25 Vul Be* 20 22 03.4304260608 +24 26 45.964990644 5.06 5.45 5.56 5.59 5.58 B6IVe 110 0
80 HD 194335 Be* 20 23 44.3690462664 +37 28 35.209455780 4.82 5.70 5.90     B2IIIe 161 0
81 * lam Cyg ** 20 47 24.53766 +36 29 26.5737 3.93 4.43 4.54 4.58 4.69 B5V 312 0
82 * f01 Cyg Be* 20 59 49.5541247496 +47 31 15.363746436 3.77 4.71 4.75 4.62 4.63 B1.5Vnne 514 0
83 HD 201733 Be* 21 09 58.6315040496 +45 30 09.197208504 5.81 6.47 6.63     B4IVp 99 0
84 * ups Cyg Be* 21 17 55.0858548408 +34 53 48.825463560 3.50 4.32 4.42 4.37 4.45 B2Vne 321 0
85 * eps Cap Be* 21 37 04.8311169408 -19 27 57.640399810 3.69 4.35 4.55 4.60 4.74 B3V 266 0
86 HD 208886 Be* 21 59 55.5415486944 -31 31 32.649950676   6.98 7.06     B5IVe 46 0
87 * eta PsA Be* 22 00 50.22537 -28 27 13.4639 4.96         B8III_sh+B8.5IV 106 0
88 * omi Aqr Be* 22 03 18.8440617830 -02 09 19.313835540 4.22 4.64 4.69 4.70 4.74 B5V 279 0
89 * 25 Peg Be* 22 07 50.3038755192 +21 42 10.536282684 5.27 5.68 5.78     B7Vne 119 0
90 * 31 Peg Be* 22 21 31.0751048 +12 12 18.662815 4.08 4.89 4.99 5.06 5.20 B3III 227 0
91 * pi. Aqr Be* 22 25 16.6230017410 +01 22 38.634449478 3.64 4.60 4.64 4.48 4.48 B1III-IVe 436 0
92 * eps PsA Be* 22 40 39.3482564136 -27 02 37.015051704 3.69 4.071 4.177     B7III 163 0
93 HD 217543 Be* 23 00 54.7485457920 +38 42 28.238625504 5.78 6.43 6.54     B2.5Vn 109 0
94 * omi And Be* 23 01 55.2649954408 +42 19 33.655865640 3.00 3.53 3.62 3.61 3.69 B6IV/V_sh 437 0
95 * bet Psc Be* 23 03 52.6132153632 +03 49 12.164302217 3.90 4.40 4.52 4.54 4.67 B6Ve 259 0
96 HD 224559 Be* 23 58 46.4393230728 +46 24 47.443832676 5.84 6.444 6.538     B4Vne 140 1
97 * eps Tuc Be* 23 59 54.9771397256 -65 34 37.677425716 4.12 4.38 4.47 4.45 4.49 B8V 145 0

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