2009A&A...508..841K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET23:06:01

2009A&A...508..841K - Astronomy and Astrophysics, volume 508, 841-848 (2009/12-3)

X-ray emission from hydrodynamical simulations in non-LTE wind models.

KRTICKA J., FELDMEIER A., OSKINOVA L.M., KUBAT J. and HAMANN W.-R.

Abstract (from CDS):

Hot stars are sources of X-ray emission originating in their winds. Although hydrodynamical simulations that are able to predict this X-ray emission are available, the inclusion of X-rays in stationary wind models is usually based on simplifying approximations. To improve this, we use results from time-dependent hydrodynamical simulations of the line-driven wind instability (seeded by the base perturbation) to derive the analytical approximation of X-ray emission in the stellar wind. We use this approximation in our non-LTE wind models and find that an improved inclusion of X-rays leads to a better agreement between model ionization fractions and those derived from observations. Furthermore, the slope of the LX-L relation is in better agreement with observations, however the X-ray luminosity is underestimated by a factor of three. We propose a possible solution for this discrepancy.

Abstract Copyright:

Journal keyword(s): stars: winds, outflows - stars: mass-loss - stars: early-type - hydrodynamics - X-rays: stars

Simbad objects: 13

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Number of rows : 13

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 * ksi Per ** 03 58 57.9022917 +35 47 27.713205 3.190 4.080 4.060 3.88 3.89 O7.5III(n)((f)) 797 0
2 * alf Cam s*b 04 54 03.0103983 +66 20 33.636467 3.47 4.34 4.29 4.18 4.18 O9Ia 641 1
3 V* AE Aur Or* 05 16 18.1489437436 +34 18 44.347016027 5.48 6.18 5.96     O9.5V 531 1
4 Cl Collinder 69 OpC 05 35 06 +09 56.0     2.8     ~ 240 0
5 * iot Ori SB* 05 35 25.9819073 -05 54 35.643537 1.45 2.53 2.77     O9IIIvar 738 0
6 * zet Ori A ** 05 40 45.527143 -01 56 33.26036   1.79 1.90     O9.2IbvarNwk 647 0
7 * mu. Col V* 05 45 59.8953630749 -32 18 23.164726112 3.84 4.90 5.18 5.30 5.57 O9.5V 465 0
8 * 15 Mon Be* 06 40 58.65963 +09 53 44.7229 3.360 4.400 4.640   4.88 O7V+B1.5/2V 758 0
9 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1748 2
10 * 63 Oph * 17 54 54.0431493243 -24 53 13.544413171 5.35 6.24 6.20 7.33   O8II((f)) 169 0
11 * 68 Cyg SB* 21 18 27.1855667264 +43 56 45.388423736 4.05 4.99 5.00     O7.5IIIn((f)) 361 0
12 * 19 Cep * 22 05 08.7884887056 +62 16 47.323982519 4.36 5.19 5.11 4.95 4.92 O9Ib 366 0
13 * lam Cep s*b 22 11 30.5750839949 +59 24 52.147736074 4.55 5.29 5.05 4.77 4.62 O6.5I(n)fp 652 1

    Equat.    Gal    SGal    Ecl

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2021.03.03-23:06:01

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