Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-07
Astronomy and Astrophysics
Astrophysics
6 pages, 4 postscript figures; contributed article, to appear in the Proceedings of the 11th Cambridge Cool Stars Workshop, Te
Scientific paper
Using the 8k x 8k CCD Mosaic Camera on the 1m Schmidt telescope in Venezuela, we are conducting a large-scale, deep optical, multiepoch, photometric (BVRIHa) survey over 120 sq.deg. in the Orion OB association, aimed at identifying the low mass stellar populations with ages less than about 10 Myr. We present initial results for a 34 sq.deg. area spanning Orion 1b, 1a and the B Cloud. Using variability as our main selection criterion we derive much cleaner samples than with the usual single-epoch photometric selection, allowing us to attain a much higher efficiency in follow up spectroscopy and resulting in an preliminary list of 74 new low-mass (~ 0.4 Msun) pre-main sequence stars. Though preliminary, this list of new T Tauri stars already suggests that the fraction of accreting young stars in 1a is much lower than in 1b, which would be expected if 1a is indeed older than 1b. We are analyzing in detail the light curves of these new stars, and spectroscopy of further candidates is under way.
Briceno Cesar
Calvet Nuria
Hartmann Lee
the QUEST Collaboration
Vivas Katherina A.
No associations
LandOfFree
The CIDA-QUEST Large Scale Variability Survey in the Orion OB Association: initial results does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The CIDA-QUEST Large Scale Variability Survey in the Orion OB Association: initial results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The CIDA-QUEST Large Scale Variability Survey in the Orion OB Association: initial results will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-660253