Differences between revisions 2 and 3

Protostars And Planets

PSU QB806.P78
Ch1: Near-Infrared Extinction and Molecular Cloud Structure, Charles J. Lada
p3 10K does not excite H₂ lowest energy rotational transitions in mid-IR
p4 2448 dark clouds 6 and 18 arcminutes ref: 2005 Dobashi K., Uehara H. Publ. Astr. Soc. Japan, 57 1-368
p7 Fig 2 Barnard 68 cloud about 200 arcseconds across, maybe 20K as², 100 AU/as
- 2 solar masses, 0.15? pc across
- sky is (4/π)(360*3600)^{2& as}2^{, 2.138e12 as}2^
E. E. Barnard's Catalog of Dark Nebulae diameters in arcseconds, "UM2 Pg" is page number in Uranometria, early 1600s 418K am² -> 1.5e9 as² -> 700 ppm of sky, assume 2/3 are missing, 0.2%

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+   ← Revision 3 as of 2015-09-23 21:53:36 → ⇥
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-  . sky is (4/&pi;)(360*3600)^2& as^2^, 2.138e12 as^2^, 23 ppm B68 clouds - except most are more distant and smaller
 . [[ http://www.dvaa.org/AData/Barnard.html | E. E. Barnard's Catalog of Dark Nebulae ]] diameters in arcseconds, "UM2 Pg" is page number in Uranometria, early 1600s 418K as^2^ ->
+  . sky is (4/&pi;)(360*3600)^2& as^2^, 2.138e12 as^2^
 . [[ http://www.dvaa.org/AData/Barnard.html | E. E. Barnard's Catalog of Dark Nebulae ]] diameters in arcseconds, "UM2 Pg" is page number in Uranometria, early 1600s 418K am^2^ ->  1.5e9 as^2^ -> 700 ppm of sky, assume 2/3 are missing, 0.2%

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