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19 April 2024 |
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Pulsation-Initiated Mass Loss in Luminous Blue Variables: A Parameter Study | | Andrew J. Onifer
; Joyce A. Guzik
; | | Date: |
6 May 2008 | | Abstract: | Luminous blue variables (LBVs) are characterized by semi-periodic episodes of
enhanced mass-loss, or outburst. The cause of these outbursts has thus far been
a mystery. One explanation is that they are initiated by kappa-effect
pulsations in the atmosphere caused by an increase in luminosity at
temperatures near the so-called ’’iron bump’’ (T ~ 200,000 K), where the Fe
opacity suddenly increases. Due to a lag in the onset of convection, this
luminosity can build until it exceeds the Eddington limit locally, seeding
pulsations and possibly driving some mass from the star. We present some
preliminary results from a parameter study focusing on the conditions necessary
to trigger normal S-Dor type (as opposed to extreme eta-Car type) outbursts. We
find that as Y increases or Z decreases, the pulsational amplitude decreases
and outburst-like behavior, indicated by a large, sudden increase in
photospheric velocity, becomes likes likely. | | Source: | arXiv, 0805.0764 | | Services: | Forum | Review | PDF | Favorites | |
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