About: Multicomponent radiatively driven stellar winds IV. On the helium decoupling in the wind of sigma Ori E

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About: Multicomponent radiatively driven stellar winds IV. On the helium decoupling in the wind of sigma Ori E Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	We study the possibility of the helium decoupling in the stellar wind of sigma Ori E. To obtain reliable wind parameters for this star we first calculate NLTE wind model and derive wind mass-loss rate and terminal velocity. Using corresponding force multipliers we study the possibility of helium decoupling. We find that helium decoupling is not possible for realistic values of helium charge (calculated from NLTE wind models). Helium decoupling only seems possible for a very low helium charge. The reason for this behavior is the strong coupling between helium and hydrogen. We also find that frictional heating becomes important in the outer parts of the wind of sigma Ori E due to the collisions between some heavier elements and the passive components - hydrogen and helium. For a metallicity ten times lower than the solar one, both hydrogen and helium decouple from the metals and may fall back onto the stellar surface. We study the possibility of the helium decoupling in the stellar wind of sigma Ori E. To obtain reliable wind parameters for this star we first calculate NLTE wind model and derive wind mass-loss rate and terminal velocity. Using corresponding force multipliers we study the possibility of helium decoupling. We find that helium decoupling is not possible for realistic values of helium charge (calculated from NLTE wind models). Helium decoupling only seems possible for a very low helium charge. The reason for this behavior is the strong coupling between helium and hydrogen. We also find that frictional heating becomes important in the outer parts of the wind of sigma Ori E due to the collisions between some heavier elements and the passive components - hydrogen and helium. For a metallicity ten times lower than the solar one, both hydrogen and helium decouple from the metals and may fall back onto the stellar surface. (en)
Title	Multicomponent radiatively driven stellar winds IV. On the helium decoupling in the wind of sigma Ori E Multicomponent radiatively driven stellar winds IV. On the helium decoupling in the wind of sigma Ori E (en)
skos:prefLabel	Multicomponent radiatively driven stellar winds IV. On the helium decoupling in the wind of sigma Ori E Multicomponent radiatively driven stellar winds IV. On the helium decoupling in the wind of sigma Ori E (en)
skos:notation	RIV/00216224:14310/06:00016004!RIV10-GA0-14310___
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA205/04/1267), P(GP205/03/D020), Z(AV0Z10030501)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Krtička, Jiří Kubát, Jiří
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Masarykova univerzita / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	487232
http://linked.open...ai/riv/idVysledku	RIV/00216224:14310/06:00016004
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	stars: winds outflows - stars: mass-loss - stars: early-type - hydrodynamics - stars: chemically peculiar (en)
http://linked.open.../riv/klicoveSlovo	stars: winds outflows
http://linked.open...odStatuVydavatele	FR - Francouzská republika
http://linked.open...ontrolniKodProRIV	[2FFFB20BA988]
http://linked.open...i/riv/nazevZdroje	Astronomy and Astrophysics
http://linked.open...in/vavai/riv/obor	BN
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Circumstellar envelopes of hot stars Hydrodynamics of stellar wind of hot stars
http://linked.open...UplatneniVysledku	2006
http://linked.open...v/svazekPeriodika	460
http://linked.open...iv/tvurceVysledku	Krtička, Jiří Kubát, Jiří Groote, Detlef
http://linked.open...n/vavai/riv/zamer	Astronomie a astrofyzika
issn	0004-6361
number of pages	9 (xsd:int)
http://localhost/t...ganizacniJednotka	14310

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