J/A+A/606/A31 METUJE wind models of O stars from our Galaxy (Krticka+, 2017)
Comoving frame models of hot star winds.
II. Reduction of O star wind mass-loss rates in global models.
Krticka J., Kubat J.
<Astron. Astrophys. 606, A31 (2017)>
=2017A&A...606A..31K 2017A&A...606A..31K (SIMBAD/NED BibCode)
ADC_Keywords: Models, atmosphere ; Stars, O ; Mass loss
Keywords: stars: winds, outflows - stars: mass-loss - stars: early-type -
hydrodynamics - radiative transfer
Abstract:
We calculate global (unified) wind models of main-sequence, giant, and
supergiant O stars from our Galaxy. The models are calculated by
solving hydrodynamic, kinetic equilibrium (also known as NLTE) and
comoving frame (CMF) radiative transfer equations from the (nearly)
hydrostatic photosphere to the supersonic wind. For given stellar
parameters, our models predict the photosphere and wind structure and
in particular the wind mass-loss rates without any free parameters.
Our predicted mass-loss rates are by a factor of 2-5 lower than the
commonly used predictions. A possible cause of the difference is
abandoning of the Sobolev approximation for the calculation of the
radiative force, because our models agree with predictions of CMF NLTE
radiative transfer codes. Our predicted mass-loss rates agree nicely
with the mass-loss rates derived from observed near-infrared and X-ray
line profiles and are slightly lower than mass-loss rates derived from
combined UV and Hα diagnostics. The empirical mass-loss rate
estimates corrected for clumping may therefore be reconciled with
theoretical predictions in such a way that the average ratio between
individual mass-loss rate estimates is not higher than about 1.6. On
the other hand, our predictions are by factor of 4.7 lower than pure
Hα mass-loss rate estimates and can be reconciled with these
values only assuming a microclumping factor of at least eight.
Description:
We present wind models for stars with parameters given in Table 1 of
the paper calculated using METUJE wind code. Individual files give
radial variations of different variables.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 18 Adopted parameters of the model grid
*/*.10 . 18 Hydrodynamic variables of heavy ions
*/*.11 . 18 Hydrodynamic variables of H+He
*/*.12 . 18 Hydrodynamic variables of electrons
*/*.27 . 18 Contribution of individual ions to the
radiative force
*/*.28 . 18 Ionization fractions
*/*.29 . 18 Level populations
*/*.81 . 18 Emergent flux
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Type Star type
15- 19 A5 --- Model Model name
21- 25 I5 K Teff Stellar effective temperature
27- 30 F4.1 Rsun R* Stellar radius
32- 35 F4.1 Msun M Stellar mass
37- 40 F4.2 [Lsun] logL Stellar luminosity
42- 47 E6.3 Msun/yr dM/dtVink Mass-loss rates derived using Vink et al.
(2001A&A...369..574V 2001A&A...369..574V) formula for
Asplund et al. (2009ARA&A..47..481A 2009ARA&A..47..481A)
mass fraction of heavier elements
49- 52 I4 km/s Vinf Predicted terminal velocity
54- 59 E6.3 Msun/yr dM/dt Predicted mass-loss rate
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Byte-by-byte Description of file: */*.10 */*.11 */*.12
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Bytes Format Units Label Explanations
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1- 4 I4 --- IR Radial grid point number
7- 19 E13.7 cm R Radius
21- 30 F10.0 cm/s Vr Radial velocity
33- 41 E9.4 g/cm3 Rho Density
44- 51 F8.0 K T Temperature
53- 58 F6.3 --- Z Mean relative charge
60- 68 E9.4 Msun/yr dM/dt Mass-loss rate
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Byte-by-byte Description of file: */*.27
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Bytes Format Units Label Explanations
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1- 4 I4 --- IR Radial grid point number
6- 15 F10.6 --- R/R* Radius relative to the stellar radius R*
17- 18 I2 --- IG Atomic number
20- 21 I2 --- IZ Ionic number (1 for neutral,
2 for singly ionized, et.)
24- 32 F9.7 --- Fion/Ftot Relative contribution to the line radiative
force in the Sobolev approximation
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Byte-by-byte Description of file: */*.28
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Bytes Format Units Label Explanations
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1- 4 I4 --- IR Radial grid point number
7- 19 E13.7 cm R Radius
21- 22 I2 --- IG Atomic number
24- 25 I2 --- IZ Ionic number (1 for neutral,
2 for singly ionized, et.)
28- 31 A4 --- Ele Elemental designation and ionic number
35- 47 E13.7 --- Nion/Nele Number density of a given ion with respect to
the number density of element
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Byte-by-byte Description of file: */*.29
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Bytes Format Units Label Explanations
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1- 4 I4 --- IR Radial grid point number
7- 19 E13.7 cm R Radius
21- 22 I2 --- IG Atomic number
24- 25 I2 --- IZ Ionic number (1 for neutral,
2 for singly ionized, et.)
28- 37 A10 --- Level Level designation
41- 53 E13.7 --- Nlev/Nele Number density of ion in a given level with
respect to the number density of element
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Byte-by-byte Description of file: */*.81
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Bytes Format Units Label Explanations
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3- 26 E24.14 1/s nu Frequency
27- 50 E24.14 10-7J/cm2 Hnu Eddington flux at the latest grid point
(in erg/cm2 unit)
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Acknowledgements:
Jiri Krticka, krticka(at)physics.muni.cz
References:
Krticka & Kubat, Paper I 2010A&A...519A..50K 2010A&A...519A..50K
(End) Jiri Krticka [MU, Czech Republic], Patricia Vannier [CDS] 31-Jul-2025