2013A&A...559A..16L


Query : 2013A&A...559A..16L

2013A&A...559A..16L - Astronomy and Astrophysics, volume 559A, 16-16 (2013/11-1)

Modelling the asymmetric wind of the luminous blue variable binary MWC 314.

LOBEL A., GROH J.H., MARTAYAN C., FREMAT Y., TORRES DOZINEL K., RASKIN G., VAN WINCKEL H., PRINS S., PESSEMIER W., WAELKENS C., HENSBERGE H., DUMORTIER L., JORISSEN A., VAN ECK S. and LEHMANN H.

Abstract (from CDS):

We present a spectroscopic analysis of MWC 314, a luminous blue variable (LBV) candidate with an extended bipolar nebula. The detailed spectroscopic variability is investigated to determine if MWC 314 is a massive binary system with a supersonically accelerating wind or a low-mass B[e] star. We compare the spectrum and spectral energy distribution to other LBVs (such as P Cyg) and find very similar physical wind properties, indicating strong kinship. We combined long-term high-resolution optical spectroscopic monitoring and V-band photometric observations to determine the orbital elements and stellar parameters and to investigate the spectral variability with the orbital phases. We developed an advanced model of the large-scale wind-velocity and wind-density structure with 3-D radiative transfer calculations that fit the orbitally modulated P Cyg profile of HeI λ5876, showing outflow velocities above 1000km/s. We find that MWC 314 is a massive semi-detached binary system of ≃1.22AU, observed at an inclination angle of i=72.8° with an orbital period of 60.8 d and e=0.23. The primary star is a low-vsini LBV candidate of m1=39.6M and R1=86.8R. The detailed radiative transfer fits show that the geometry of wind density is asymmetric around the primary star with increased wind density by a factor of 3.3, which leads the orbit of the primary. The variable orientation causes the orbital modulation that is observed in absorption portions of P Cyg wind lines. Wind accretion in the system produces a circumbinary disc. MWC 314 is in a crucial evolutionary phase of close binary systems, when the massive primary star has its H envelope being stripped and is losing mass to a circumbinary disc. MWC 314 is a key system for studying the evolutionary consequences of these effects.

Abstract Copyright:

Journal keyword(s): stars: emission-line, Be - binaries: spectroscopic - stars: massive - stars: winds, outflows - line: profiles - transfer radiative

CDS comments: Paragraph 1. V1492 Aql is a misprint for V1429 Aql.

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 5980 WR* 00 59 26.5838833944 -72 09 53.927337312   11.13 11.31   11.029 WN4+O7I: 380 1
2 HD 14947 s*b 02 26 46.9899705528 +58 52 33.118732380 7.83 8.44 7.98     O4.5If 249 0
3 HD 269128 s*b 05 10 22.7893360416 -68 46 23.816621928 9.77 10.52 10.412 10.29 10.268 B2.5Ieq 100 0
4 V* S Dor sg* 05 18 14.3570612088 -69 15 01.149576912 9.08 10.39 10.25 9.74 9.14 A5Iaeq 368 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16509 1
6 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4781 2
7 * zet Tau Be* 05 37 38.6854231 +21 08 33.158804 2.22 2.84 3.03 3.06 3.15 B1IVe_shell 712 0
8 HD 90177 s*b 10 22 53.8430096928 -59 37 28.363616256 9.16 9.66 8 8.15   LBV 321 0
9 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2363 0
10 WRAY 15-682 WR* 10 53 59.5777329720 -60 26 44.361095316   11.64 10.85 10.56   WN11h 145 3
11 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 617 0
12 MR 35 s*b 11 08 40.0634208096 -60 42 51.721320060   12.33 10.20 11.66   LBV 124 0
13 V* BP Cru HXB 12 26 37.5605188992 -62 46 13.261044684   12.70 10.66     B1.5Iaeq 657 0
14 Cl* Westerlund 1 W 243 s*b 16 47 07.5040736160 -45 52 29.123491188   19.873 15.730     LBV 57 0
15 * zet01 Sco s*b 16 53 59.7271314888 -42 21 43.307334468 4.80 5.31 4.79 4.32 3.86 B1Ia-0ek 362 0
16 HD 326823 WR* 17 06 53.9045282184 -42 36 39.704037840 9.68 9.87 9.03 9.51   WNpec 77 1
17 [B61] 2 s*b 17 41 35.4358256400 -30 06 38.782127520   18.0 15.00 14.23 10.30 LBV_B[e]: 44 0
18 HD 160529 sg* 17 41 59.0261939376 -33 30 13.704456780 8.17 7.87 6.66 5.50 4.51 A2Ia 192 1
19 NAME Pistol HII 17 46 15.2 -28 49 49           ~ 68 0
20 [FMM95] 3 s*b 17 46 15.240 -28 50 03.58           LBV 147 1
21 [GMC99] D6 s*b 17 46 17.982 -28 49 03.46           LBV 61 0
22 WR 102ka WR* 17 46 18.12 -29 01 36.6           WN10 31 0
23 HD 316285 s*b 17 48 14.0372119152 -28 00 53.121269592 11.88 11.27 9.60 9.28   B0Ieq 187 2
24 HD 168607 s*b 18 21 14.8856951904 -16 22 31.763755236 10.23 9.82 8.28 8.55   B9Iaep 183 1
25 HD 168625 s*b 18 21 19.5484021368 -16 22 26.075142156 10.15 9.78 8.37 8.76   B6Iap 270 2
26 V* V481 Sct s*b 18 33 55.2781965336 -06 58 38.631350604           LBV_B[e]: 48 0
27 IRAS 18576+0341 s*b 19 00 10.89456 +03 45 47.1096           B8I 85 0
28 BD+14 3887 Em* 19 21 33.9771479376 +14 52 56.910478296 11.86 11.3 9.89     B3Ibe 90 0
29 [KW97] 37-17 LP* 19 23 47.6411937672 +14 36 39.061233900     15.1     O4I 20 0
30 * P Cyg s*b 20 17 47.2020844 +38 01 58.552724 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1160 1
31 IRAS 20298+4011 Em* 20 31 42.2846664600 +40 21 59.074415640     15.1     B:I[e] 91 0
32 Schulte 12 s*b 20 32 40.9572199728 +41 14 29.279036940 16.1 14.45 11.702     B3-4Ia+ 402 0
33 EM* MWC 349A * 20 32 45.5291969760 +40 39 36.651807828           ~ 158 0
34 SN 2009ip s*b 22 23 08.26 -28 56 52.4           LBV 327 0
35 V* V509 Cas LP* 23 00 05.1012218544 +56 56 43.350876312 8.01 6.68 5.13 3.96 3.11 G4_0 324 0

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2023.01.30-23:29:01

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