2017ApJ...841...73K -
Astrophys. J., 841, 73-73 (2017/June-1)
Nearby young, active, late-type dwarfs in Gaia's First Data Release.
KASTNER J.H., SACCO G., RODRIGUEZ D., PUNZI K., ZUCKERMAN B. and VICAN HANEY L.
Abstract (from CDS):
The Galex Nearby Young Star Survey (GALNYSS) has yielded a sample of ∼2000 UV-selected objects that are candidate nearby (D 150 pc), young (age ∼ 10-100 Myr), late-type stars. Here, we evaluate the distances and ages of the subsample of (19) GALNYSS stars with Gaia Data Release 1 (DR1) parallax distances D 120 pc. The overall youth of these 19 mid-K to early-M stars is readily apparent from their positions relative to the loci of main-sequence stars and giants in Gaia-based color-magnitude and color-color diagrams constructed for all stars detected by Galex and the Wide-field Infrared Space Explorer for which parallax measurements are included in DR1. The isochronal ages of all 19 stars lie in the range ∼10-100 Myr. Comparison with Li-based age estimates indicates a handful of these stars may be young main-sequence binaries rather than pre-main sequence stars. Nine of the 19 objects have not previously been considered as nearby, young stars, and all but one of these are found at declinations north of +30°. The Gaia DR1 results presented here indicate that the GALNYSS sample includes several hundred nearby, young stars, a substantial fraction of which have not been previously recognized as having ages 100 Myr.
Abstract Copyright:
© 2017. The American Astronomical Society. All rights reserved.
Journal keyword(s):
stars: activity - stars: chromospheres - stars: late-type - stars: pre-main sequence - stars: pre-main sequence
Simbad objects:
31
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