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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Radial-Velocity Variability of G-Type Giants: First Three Years of the Okayama Planet Search Program
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Radial-Velocity Variability of G-Type Giants: First Three Years of the Okayama Planet Search Program

机译:G型巨人的径向速度变异性:冈山行星搜寻计划的前三年

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Wereportontheradial-velocityvariabilityofG-typegiantsbasedontheresultsofpreciseDopplermeasurementsof57starsthatwereobservedforthefirst3yearsoftheOkayamaPlanetSearchProgram.Thisprogramaimstosearchforplanetsaroundintermediate-massstarsintheirevolvedstagesaslate-Ggiants.Wefoundthatmostofthetargetswith$$B-V1.0$$haveradial-velocityscattersof$$sigmasim10;mathrm{m},mathrm{s}^{-1}$$,withthemoststablereachinglevelsof$$6hbox{--}8,mathrm{m},mathrm{s}^{-1}$$,whilethosewith$$B-V1.0$$typicallyshow$$sigmasim20,mathrm{m},mathrm{s}^{-1}$$.Intotal,about60%ofthetargetsarestableinradialvelocitytoalevelof$$sigma15,mathrm{m},mathrm{s}^{-1}$$over1a€“3years,andabout90%have$$sigma30,mathrm{m},mathrm{s}^{-1}$$.Wefoundthat4stars(HD30557,HD34559,HD68077,andHD85444)showsignificantlong-termradial-velocitytrends,suggestingthattheyareprobablyorbitedbyunseenstellarorsubstellarcompanions.Threestars(HD79181,HD104985,andHD141680)showperiodicradial-velocityvariations.HD104985isthefirstplanet-harboringstardiscoveredfromoursurvey.Thepropertiesofthevariationsinthese3starshavebeen,andwillbe,extensivelydiscussedinseparatepapers.Relativelylarge,butnotapparentlyperiodic,radial-velocityvariationsof$$sigmagt30,mathrm{m},mathrm{s}^{-1}sigma30,mathrm{m},mathrm{s}^{-1}$$arefoundin4stars(HD41597,HD134190,HD161178,andHD176598).Formostofthestarswithoutshowinganysignificantperiodicity,wecanexcludecompanionswith$$Kgt50,mathrm{m},mathrm{s}^{-1}K50,mathrm{m},mathrm{s}^{-1}$$,or$$m_2sinigt1.8,M_mathrm{J}(a/mathrm{AU})^{1/2}(M_{*}/{{{M}_{odot}}})^{1/2}m_2sini1.8,M_mathrm{J}(a/mathrm{AU})^{1/2}(M_{*}/{{{M}_{odot}}})^{1/2}$$fororbitalradii$$alesssim1hbox{--}2,mathrm{AU}$$.
机译:Wereportontheradial-velocityvariabilityofG-typegiantsbasedontheresultsofpreciseDopplermeasurementsof57starsthatwereobservedforthefirst3yearsoftheOkayamaPlanetSearchProgram.Thisprogramaimstosearchforplanetsaroundintermediate-massstarsintheirevolvedstagesaslate-Ggiants.Wefoundthatmostofthetargetswith $$ B-VLT; 1.0 $$ haveradial-velocityscattersof $$ sigmasim10; mathrm {M},mathrm {S} ^ { - 1} $$,withthemoststablereachinglevelsof $$ 6hbox {-} 8,mathrm {m},mathrm {s} ^ {-1} $$,而那些带有$$ B-V 1.0 $$通常显示$ sigmasim20,mathrm {m},mathrm {s} ^ {- 1} $$。总共大约60%的目标径向空速达到$ sigmalt的水平; 15,mathrm {m},mathrm {s} ^ {-1} $ a3年以上,而大约90%的目标具有$ sigma 30,mathrm {m} ,mathrm {s} ^ {-1} $$。我们发现4星(HD30557,HD34559,HD68077和HD85444)表现出重要的长期径向趋势,这表明这颗恒星可能由无义的恒星亚星状伴星围绕轨道飞行。三星(HD79181,HD104985-HD104985,HD104985,HD104985和HD104985)。从我们的调查中确认。这些3星的变化的性质已经出现,并且将在单独的纸上广泛讨论。相对较大但不是明显的周期性,径向速度变化$$ sigmagt30,mathrm {m},mathrm {s} {{{}} {{}} {{-1} sm} ^ 30,mathm {ma} } $$位于4星(HD41597,HD134190,HD161178和HD176598)中。对于大多数不显示任何明显周期性的星,我们可以排除$$ Kgt50,mathrm {m},mathrm {s} ^ {-1},K 50,mathrm {m},mathrm { -1} $$或$$ m_2sinigt1.8,M_mathrm {J}(a / mathrm {AU})^ {1/2}(M _ {*} / {{{M} _ {odot}}})^ {1/2} m_2sini 1.8,M_mathrm {J}(a / mathrm {AU})^ {1/2}(M _ {** / {{{M} _ {odot}}})^ {1/2 } $$ fororbitalradii $$ alesssim1hbox {-} 2,mathrm {AU} $$。

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