Triggers:YSOecl
From Gaia Science Alerts Working Group
Revision as of 16:08, 24 July 2013 by Aleks.scholz (talk | contribs)
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.
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
