Near-Infrared Spectroscopic Monitoring Observations of Three Yellow Hypergiants and Time Variation of 2.3 $mu$m CO Features of $ ho $ Cassiopeia

Yamamuro Tomoyasu; Nishimaki Yuichirou; Motohara Kentaro; Miyata Takashi; Tanaka Masuo

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Near-Infrared Spectroscopic Monitoring Observations of Three Yellow Hypergiants and Time Variation of 2.3 $mu$m CO Features of $ ho $ Cassiopeia

机译：三种黄色超巨人的近红外光谱监测观察和2.3亩豆科植物CO特征的时变

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Wemadespectroscopicmonitoringobservationsofthethreeyellowhypergiants($$ ho$$Cassiopeia,HR8752,andIRC$$+$$10420)inthe0.9a€“2.4$$mu$$mwavelengthrangewitharesolutionof$$sim$$2600overafifteenmonthperiod.ThespectraofHR8752andIRC$$+$$10420showednotimevariations.Ontheotherhand,thoseof$$ ho$$Casshowedjustaseriesoftimevariationin2.3$$mu$$mCOfeaturesfromnondetectiontoabsorptionthroughemissionduring2002a€“2004.Weinterpretthisvariationasbeingaresultofanexpandinggasshellwhoseexcitationtemperaturewasbeingcooleddownto$$sim$$800a€‰K.TheCOcolumndensitieswereestimatedfromtheCOabsorptiondepths.Moreover,assumingsphericalsymmetryoftheexpandingshellwithaconstantexpansionvelocityof35a€‰kma€‰s$$^{-1}$$,astellareffectivetemperatureof7000a€‰K,astellarradiusof400$$R_{odot}$$,solarabundance,andallcarbonatomsformingCOmolecules,weestimatedthemassoftheshelltobe$$sim2 imes10^{-3}M_{odot}$$foramodelwithasingleshellexpandingfromthephotosphere,or$$sim5 imes10^{-4}M_{odot}$$foranothermodelwithanexpandingshellandastaticenvelope.Theseestimatesofthereleasedmassstronglydependonassumptionsoftheexpansionvelocity,theabundance,andthedissociationoftheCOmolecules.

机译：我们在0.9a€“ 2.4 $$ mu $$ m波长范围内，在三个月以上的时间内，分别对3个黄色hypergiants（$$ ho $仙后座，HR8752和IRC $$ + $ 10420）进行了光谱监测观察。豪$$ Casshowedjustaseriesoftimevariationin2.3 $$我$$ mCOfeaturesfromnondetectiontoabsorptionthroughemissionduring2002a€“2004.Weinterpretthisvariationasbeingaresultofanexpandinggasshellwhoseexcitationtemperaturewasbeingcooleddownto $$我$$ 800A€‰K.TheCOcolumndensitieswereestimatedfromtheCOabsorptiondepths.Moreover，assumingsphericalsymmetryoftheexpandingshellwithaconstantexpansionvelocityof35a€‰KMA€‰小号$$ ^ { - 1} $$，astellareffectivetemperatureof7000a€ ‰K，400 $$的天体半径R_ {odot} $$，太阳丰度和所有形成碳原子的大分子，我们估算了massoftsoftshell将成为$$ sim2 imes10 ^ {-3} M_ {odot} $$对于一个具有从图上展开的单壳的模型$对于带有扩展壳的另一个模型和静态视线的软化很大程度上取决于对碳分子的扩展速度，丰度和解离的假设。

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《PASJ: Publications of the Astronomical Society of Japan》 |2007年第5期|共页
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Yamamuro Tomoyasu; Nishimaki Yuichirou; Motohara Kentaro; Miyata Takashi; Tanaka Masuo;
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7. Near-Infrared Spectroscopic Monitoring Observations of Three Yellow Hypergiants and Time Variation of 2.3 $mu$m CO Features of $ho $ Cassiopeia [O] . Tomoyasu Yamamuro, Yuichirou Nishimaki, Kentaro Motohara, 2007

机译：近红外光谱监测观察三个黄色高码和时间变化2.3 $ mu $ m $ rho $ cassiopeia

Near-Infrared Spectroscopic Monitoring Observations of Three Yellow Hypergiants and Time Variation of 2.3 $mu$m CO Features of $ ho $ Cassiopeia

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