Difference between revisions of "Triggers:FUOri"

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(Created page with 'FU Orionis (V1647 Ori) is young pre-main sequence stars, illuminating a McNeil's nebula in the vicinity of NGC 2068 star-forming region. File:FUOri Plot from [http://www.ta3...')
 
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FU Orionis (V1647 Ori) is young pre-main sequence stars, illuminating a McNeil's nebula in the vicinity of NGC 2068 star-forming region.
 
FU Orionis (V1647 Ori) is young pre-main sequence stars, illuminating a McNeil's nebula in the vicinity of NGC 2068 star-forming region.
  
[[File:FUOri]]
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[[File:FUOri.png]]
 
Plot from [http://www.ta3.sk/caosp/Eedition/FullTexts/vol36no3/pp149-157.pdf D.Chochol et al. 2006].
 
Plot from [http://www.ta3.sk/caosp/Eedition/FullTexts/vol36no3/pp149-157.pdf D.Chochol et al. 2006].
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 +
Characteristics:
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* Very rare
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* Outbursts repeat with a time scale of 40 years (1978, 2003)
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* Amplitude: 5 mag over 4 months
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* Outbursts last for 2 years
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* Spectrum: red, heavily veiled continuum with strong emission of <math>H_{\alpha}</math>; in blue consistent with an early B spectral type
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* X-ray variability present
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More general characteristics of FUors, based on other examples
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* FU Ori and V1057 Cyg rise over 1 yr, whereas V1515 Cyg rise over 20 years
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* FU Ori and V1515 Cyg decline over 20-100 years, V1015 Cyg decays faster (10 yrs)
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* Spectra: F or G supergiants
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* Some of them are embedded in nebulas
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* OO Serpentis is newly discovered another example of FU Ori [http://arxiv.org/abs/0705.1231 Kospal et al. 2007].

Revision as of 12:36, 10 July 2009

FU Orionis (V1647 Ori) is young pre-main sequence stars, illuminating a McNeil's nebula in the vicinity of NGC 2068 star-forming region.

FUOri.png Plot from D.Chochol et al. 2006.

Characteristics:

  • Very rare
  • Outbursts repeat with a time scale of 40 years (1978, 2003)
  • Amplitude: 5 mag over 4 months
  • Outbursts last for 2 years
  • Spectrum: red, heavily veiled continuum with strong emission of <math>H_{\alpha}</math>; in blue consistent with an early B spectral type
  • X-ray variability present

More general characteristics of FUors, based on other examples

  • FU Ori and V1057 Cyg rise over 1 yr, whereas V1515 Cyg rise over 20 years
  • FU Ori and V1515 Cyg decline over 20-100 years, V1015 Cyg decays faster (10 yrs)
  • Spectra: F or G supergiants
  • Some of them are embedded in nebulas
  • OO Serpentis is newly discovered another example of FU Ori Kospal et al. 2007.