2002A&A...393..543V


Query : 2002A&A...393..543V

2002A&A...393..543V - Astronomy and Astrophysics, volume 393, 543-553 (2002/10-2)

Predictions of variable mass loss for Luminous Blue Variables.

VINK J.S. and DE KOTER A.

Abstract (from CDS):

We present radiation-driven wind models for Luminous Blue Variables (LBVs) and predict their mass-loss rates. We study the effects of lower masses and modified abundances in comparison to the normal OB supergiants, and we find that the main difference in mass loss is due to the lower masses of LBVs. In addition, we find that the increase in helium abundance changes the mass-loss properties by small amounts (up to about 0.2dex in log{dot}(M)), while CNO processing is relatively unimportant for the mass-loss rate. A comparison between our mass loss predictions and the observations is performed for four relatively well-studied LBVs. The comparison shows that (i) the winds of LBVs are driven by radiation pressure on spectral lines, (ii) the variable mass loss behaviour of LBVs during their SDoradus-type variation cycles is explained by changes in the line driving efficiency, notably due to the recombination/ionisation of FeIV/III and FeIII/II, and finally, (iii) the winds of LBVs can be used to derive their masses, as exemplified by the case of AG Car, for which we derive a present-day mass of 35M.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: mass-loss - stars: supergiants - stars: winds, outflows - stars: evolution

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 269006 s*b 05 02 07.3942092168 -71 20 13.116800076 9.93 10.60 10.55 10.43 10.38 LBV 252 0
2 HD 269662 sg* 05 30 51.4749432240 -69 02 58.590657600 10.23 10.52 10.28 10.40 10.390 A0Ia 103 0
3 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 631 0

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