Journal
ASTRONOMICAL JOURNAL
Volume 147, Issue 4, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/147/4/85
Keywords
open clusters and associations: general; parallaxes; solar neighborhood; stars: low-mass; stars: pre-main sequence
Categories
Funding
- National Science Foundation [AST 05-07711, AST 09-08402]
- NASA's Space Interferometry Mission
- UK Science and Technology Facilities Council
- University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology
- National Aeronautics and Space Administration
- National Science Foundation
- AAVSO Photometric All-Sky Survey (APASS)
- Robert Martin Ayers Science Fund
- FONDECYT grant [3130520]
- NASA award [11-ADAP11-0169]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009080, 1153335] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009643, 1109445] Funding Source: National Science Foundation
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We present basic observational data and association membership analysis for 45 young and active low-mass stellar systems from the ongoing Research Consortium On Nearby Stars photometry and astrometry program at the Cerro Tololo Inter-American Observatory. Most of these systems have saturated X-ray emission (log(L-x /L-bol) > -3.5) based on X-ray fluxes from the ROSAT All-Sky Survey, and many are significantly more luminous than main-sequence stars of comparable color. We present parallaxes and proper motions, Johnson-Kron-Cousins VRI photometry, and multiplicity observations from the CTIOPI program on the CTIO 0.9 m telescope. To this we add low-resolution optical spectroscopy and line measurements from the CTIO 1.5 m telescope, and interferometric binary measurements from the Hubble Space Telescope Fine Guidance Sensors. We also incorporate data from published sources: JHKs photometry from the Two Micron All Sky Survey point source catalog, X-ray data from the ROSAT All-Sky Survey, and radial velocities from literature sources. Within the sample of 45 systems, we identify 21 candidate low-mass pre-main-sequence members of nearby associations, including members of beta Pictoris, TW Hydrae, Argus, AB Doradus, two ambiguous approximate to 30 Myr old systems, and one object that may be a member of the Ursa Major moving group. Of the 21 candidate young systems, 14 are newly identified as a result of this work, and six of those are within 25 pc of the Sun.
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