Rotation-Infall Motion around the Protostar IRAS 16293-2422 Traced by Water Maser Emission

Publications of the Astronomical Society of Japan

Miyoshi, Makoto¹  Iwata, Takahiro³  Imai, Hiroshi² 

[1] VERA Project Office, National Astronomical Observatory, Mitaka, Tokyo 181-8588;Mizusawa Astrogeodynamics Observatory, National Astronomical Observatory, Mizusawa, Iwate 023-0861; it;Mizusawa Astrogeodynamics Observatory, National Astronomical Observatory, Mizusawa, Iwate 023-0861; it Kashima Space Research Center, Communications Research Laboratory, Kashima, Ibaraki 314-0012

关键词: Masers;    "Stars: formation";    "Stars: mass accretion";    "Stars: individual [IRAS 16293-2422 (ρ OPH East)]";   

DOI  :  10.1093/pasj/51.4.473

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

WemadeVLBIobservationsofthewatermaseremissionassociatedwithaprotostar,IRAS16293-2422,usingtheKashima-NobeyamaInterferometer(KNIFE)tandtheJapanesedomesticVLBInetwork(J-Net).*Thesedistributionsofwatermaserfeaturesshowedtheblue-shiftedandred-shiftedcomponentsseparatedinthenorth-southdirectionamongthreeepochsspanningthreeyears.Thedirectionoftheseparationwasperpendiculartothemolecularoutflowandparalleltotheelongationofthemoleculardisk.Thesesteadydistributionsweresuccessfullymodeledbyarotating-infallingdiskwithanouterradiusof100AUaroundacentralobjectwithamassof0.3M®.Thelocalspecificangularmomentumofthediskwascalculatedtobe0.2–1.0×10∼3kms−1pcataradiusof20–100AU.ThisvalueisroughlyequaltothatofthediskofIRAS00338+6312inL1287andthoseofthemoleculardisksaroundtheprotostarsintheTaurusmolecularcloud.Therelativelylargediskradiusofabout100AUtracedbywatermaseremissionsuggeststhatimpingingclumpsontothediskshouldbehotterthan200Ktoexcitethewatermaseremission.

【 授权许可】

Unknown