Difference between revisions of "Triggers:YSOecl"
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* shapes can be irregular | * shapes can be irregular | ||
* timescales days to years | * timescales days to years | ||
| − | * high amplitudes possible (several mags) | + | * high amplitudes possible (several mags), cutoff of 1mag is probably useful |
* very few known, every new detection would help | * very few known, every new detection would help | ||
| + | |||
| + | Trigger is necessary to figure out the origin of the eclipse -- the eclipsing body could be a part of the disk, clumps, protoplanetary structures, etc. | ||
| + | |||
| + | Identification: | ||
| + | * >1mag drop off in magnitude | ||
| + | * red spectrum, any spectral type | ||
| + | * J-K>1. IR excess, UV excess | ||
| + | * IRAC3 [5.8mu] - IRAC4 [8.0mu] > 0.4 | ||
| + | * WISE1 [3.5mu] - WISE4 [22mu] > 2.0 | ||
| + | * WISE1 [3.5mu] - WISE2 [4.5mu] > 0.3 (weak criterion) | ||
| + | * Halpha emission | ||
Examples: | Examples: | ||
Latest revision as of 15:08, 24 July 2013
Eclipsing young stellar objects
Characteristics:
- long-lasting eclipses by disk material
- shapes can be irregular
- timescales days to years
- high amplitudes possible (several mags), cutoff of 1mag is probably useful
- very few known, every new detection would help
Trigger is necessary to figure out the origin of the eclipse -- the eclipsing body could be a part of the disk, clumps, protoplanetary structures, etc.
Identification:
- >1mag drop off in magnitude
- red spectrum, any spectral type
- J-K>1. IR excess, UV excess
- IRAC3 [5.8mu] - IRAC4 [8.0mu] > 0.4
- WISE1 [3.5mu] - WISE4 [22mu] > 2.0
- WISE1 [3.5mu] - WISE2 [4.5mu] > 0.3 (weak criterion)
- Halpha emission
Examples:
- KH15D: recurrent, but changing eclipses- see Herbst et al. 2012 http://adsabs.harvard.edu/abs/2010AJ....140.2025H
- RW Aur: singular event - http://figshare.com/articles/A_huge_eclipse_in_the_young_star_RW_Aur/92169
- YLW 16 A: has smaller eclipses- http://adsabs.harvard.edu/abs/2013A%26A...554A.110P
