The orion region презентация

What’s Up for Imagers
 The Orion Region
 November 2008Whazzup Here?
 Huge molecular cloud in the Orion-Monoceros region 
 AOrion Molecular Cloud
 The overall cloud contains something like 2x105 solarOrion Molecular Cloud
 The portion within Orion is about ½ that,Orion OB1 Association
 OB Associations 
 Loose, co-moving stellar groups ofOrion OB1 Association
 Brightest stars in Orion are very young typeWhere Does M42 Fit In?The TrapeziumProtoplanetary Disks
 Rotating disk of dense gas around a new star



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What’s Up for Imagers The Orion Region November 2008


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Whazzup Here? Huge molecular cloud in the Orion-Monoceros region A large swarm of very hot O and B stars – an “OB” association Numerous famous emission and reflection nebulae

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Orion Molecular Cloud The overall cloud contains something like 2x105 solar masses Not just molecular hydrogen… Spectroscopic signatures of nearly 150 molecules observed in these clouds “Exotics” include benzene, acetic acid, and formaldehyde

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Orion Molecular Cloud The portion within Orion is about ½ that, separated into ‘A’ and ‘B’ regions Roughly associated with M42 and the Flame nebula, respectively Areas of intense star formation Eastern edge roughly marked by Barnard’s loop

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Orion OB1 Association OB Associations Loose, co-moving stellar groups of Type O and early B-type stars Typical lifetimes of < 30M years Often found along the edge of a spiral arm as part of a density gradient Internal age differences suggest successive “triggering” events

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Orion OB1 Association Brightest stars in Orion are very young type O and B stars 1a, 1b (Belt region), 10-12 million years old 1c (Sword region), 3-6 million years old 1d (Orion Nebula and Trapezium cluster), 1-4 million years old

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Where Does M42 Fit In?

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The Trapezium

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Protoplanetary Disks Rotating disk of dense gas around a new star Flattened because of rotation in the collapsing gas Initial collapse takes about 105 years; ongoing accretion for about 107 years Often “shredded” by radiation from bright stars – this creates the “coma” shape

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