skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Young Stars with SALT

Abstract

We present a spectroscopic and kinematic analysis of 79 nearby M dwarfs in 77 systems. All of these dwarfs are low-proper-motion southern hemisphere objects and were identified in a nearby star survey with a demonstrated sensitivity to young stars. Using low-resolution optical spectroscopy from the Red Side Spectrograph on the South African Large Telescope, we have determined radial velocities, H-alpha, lithium 6708 Å, and potassium 7699 Å equivalent widths linked to age and activity, and spectral types for all of our targets. Combined with astrometric information from literature sources, we identify 44 young stars. Eighteen are previously known members of moving groups within 100 pc of the Sun. Twelve are new members, including one member of the TW Hydra moving group, one member of the 32 Orionis moving group, 9 members of Tucana-Horologium, one member of Argus, and two new members of AB Doradus. We also find 14 young star systems that are not members of any known groups. The remaining 33 star systems do not appear to be young. This appears to be evidence of a new population of nearby young stars not related to the known nearby young moving groups.

Authors:
 [1]; ; ;  [2];  [3]
  1. Department of Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States)
  2. Department of Astrophysics, The American Museum of Natural History, New York, NY 10024 (United States)
  3. RECONS Institute, Chambersburg, PA (United States)
Publication Date:
OSTI Identifier:
22663620
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 840; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DWARF STARS; LITHIUM; MASS; POTASSIUM; PROPER MOTION; RADIAL VELOCITY; RESOLUTION; SENSITIVITY; SOUTHERN HEMISPHERE; SPECTROSCOPY; TELESCOPES

Citation Formats

Riedel, Adric R., Alam, Munazza K., Rice, Emily L., Cruz, Kelle L., and Henry, Todd J., E-mail: arr@caltech.edu. Young Stars with SALT. United States: N. p., 2017. Web. doi:10.3847/1538-4357/840/2/87.
Riedel, Adric R., Alam, Munazza K., Rice, Emily L., Cruz, Kelle L., & Henry, Todd J., E-mail: arr@caltech.edu. Young Stars with SALT. United States. doi:10.3847/1538-4357/840/2/87.
Riedel, Adric R., Alam, Munazza K., Rice, Emily L., Cruz, Kelle L., and Henry, Todd J., E-mail: arr@caltech.edu. Wed . "Young Stars with SALT". United States. doi:10.3847/1538-4357/840/2/87.
@article{osti_22663620,
title = {Young Stars with SALT},
author = {Riedel, Adric R. and Alam, Munazza K. and Rice, Emily L. and Cruz, Kelle L. and Henry, Todd J., E-mail: arr@caltech.edu},
abstractNote = {We present a spectroscopic and kinematic analysis of 79 nearby M dwarfs in 77 systems. All of these dwarfs are low-proper-motion southern hemisphere objects and were identified in a nearby star survey with a demonstrated sensitivity to young stars. Using low-resolution optical spectroscopy from the Red Side Spectrograph on the South African Large Telescope, we have determined radial velocities, H-alpha, lithium 6708 Å, and potassium 7699 Å equivalent widths linked to age and activity, and spectral types for all of our targets. Combined with astrometric information from literature sources, we identify 44 young stars. Eighteen are previously known members of moving groups within 100 pc of the Sun. Twelve are new members, including one member of the TW Hydra moving group, one member of the 32 Orionis moving group, 9 members of Tucana-Horologium, one member of Argus, and two new members of AB Doradus. We also find 14 young star systems that are not members of any known groups. The remaining 33 star systems do not appear to be young. This appears to be evidence of a new population of nearby young stars not related to the known nearby young moving groups.},
doi = {10.3847/1538-4357/840/2/87},
journal = {Astrophysical Journal},
number = 2,
volume = 840,
place = {United States},
year = {Wed May 10 00:00:00 EDT 2017},
month = {Wed May 10 00:00:00 EDT 2017}
}