Frosty Leo Nebula: Difference between revisions
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The '''Frosty Leo Nebula''' is a [[protoplanetary nebula]] (PPN) located roughly at 3,000 [[light-year]]s {{Harv|Davis|Smith|Gledhill|Varricatt|2005}} away from [[Earth]]. It is a [[bipolar nebula]]. Its [[central star]] is of spectral type K7II. It is unusual in that it has an extremely deep absorption feature at 3.1µm and is unusually located at more than 900 pc above the plane of our galaxy.{{Harv|Bourke|Hyland|Robinson|Luhman|2000}} |
The '''Frosty Leo Nebula''' is a [[protoplanetary nebula]] (PPN) located roughly at 3,000 [[light-year]]s {{Harv|Davis|Smith|Gledhill|Varricatt|2005}} away from [[Earth]]. It is a spectral<ref name="Omont1990">{{Harv|Omont|Forveille|Moseley|Glaccum|1990}}</ref> [[bipolar nebula]]. Its [[central star]] is of spectral type K7II. It is unusual in that it has an extremely deep absorption feature at 3.1µm and is unusually located at more than 900 pc above the plane of our galaxy.{{Harv|Bourke|Hyland|Robinson|Luhman|2000}} |
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==Observation history== |
==Observation history== |
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Revision as of 02:03, 24 June 2007
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| Nebula | |
|---|---|
| Observation data: J2000 epoch | |
| Right ascension | 09h 39m 53.96s[1] |
| Declination | +11° 58′ 52.4″[1] |
| Distance | 3 kly (920 pc)[2] ly |
| Constellation | Leo |
| Physical characteristics | |
| Radius | ? ly[a] ly |
| Absolute magnitude (V) | ?[b] |
| Notable features | - |
| Designations | IRAS 09371+1212[1] |
The Frosty Leo Nebula is a protoplanetary nebula (PPN) located roughly at 3,000 light-years (Davis et al. 2005) away from Earth. It is a spectral[3] bipolar nebula. Its central star is of spectral type K7II. It is unusual in that it has an extremely deep absorption feature at 3.1µm and is unusually located at more than 900 pc above the plane of our galaxy.(Bourke et al. 2000)
Observation history
This PPN was first noticed in the IRAS survey due to its exceptionally cold IRAS color temperatures.[4] It also has an uniquely sharp maximum at 60-μM.[5]
Naming
Forveille et al. 1987 dubbed IRAS 09371+1212 as the "Frosty Leo Nebula" because of their interpretation of the object's extremely unusual far infrared spectrum that water is largely depleted in its gaseous state by ice condensation into grains. Their interpretation was subsequently verified in 1988 by three independent papers.[4] Omont et al. 1990 further observed in the band between 35 to 65 μM that very cold (<50 K) silicate dust grains, abundantly coated with crystalline ice, are responsible for the 60-μM excess.[4]
Notes
- ^ distance × sin( diameter_angle / 2 ) = ? ly. radius
- ^ ?[1] apparent magnitude - 5 * (log10(920 pc distance) - 1) = ? absolute magnitude
- ^ a b c d (SIMBAD 2007)
- ^ (Davis et al. 2005)
- ^ (Omont et al. 1990)
- ^ a b c (Morris & Reipurth 1990)
- ^ (Forveille et al. 1987)
References
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