Dust–Gas Accretion onto a Luminous Object

Publications of the Astronomical Society of Japan

Fukue, Jun¹ 

[1] Astronomical Institute, Osaka Kyoiku University, Asahigaoka, Kashiwara, Osaka 582-8582

关键词: accretion;    "black hole physics";    dust;    radiation;    "stars: formation";   

DOI  :  10.1093/pasj/53.2.275

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Sphericalaccretionofdustandgasontoagravitatingobjectisexaminedundertheinfluenceofcentralradiation.Wefoundthat,aslongasthecentralluminosityislessthantheEddingtononefordust,thegasflowisalmostBonditype,whilethedustflowisgreatlyaffectedbycentralradiation.Fornon-luminoussources,intheouterregionwherethegravityonthedustisbalancedbythedragforce,theinfallvelocityofdustisgenerallylargerthanthegasvelocity.Bothgasanddustfreefallintheinnerregion.Asthedust-to-gasratioincreases,thegasaccretionrateslightlydecreases,whilethedustaccretionrateincreases.Asaresult,thetotalaccretionrateincreases.Whenthecentralluminosityisconsidered,theinfallvelocityofdustbecomessmallerandsmaller,asthecentralluminosityincreases.Althoughthegasaccretionrateslightlyincreaseswithluminosity,thedustaccretionratelinearlydecreasesduetotheradiationpressure.Asaresult,thetotalaccretionratedecreaseswithluminosity.Approximateexpressionsfordustandgasaccretionrateswereobtained.

【 授权许可】

Unknown