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Young Stars with SALT

Riedel, Adric R. and Alam, Munazza K. and Rice, Emily L. and Cruz, Kelle L. and Henry, Todd J. (2017) Young Stars with SALT. Astrophysical Journal, 840 (2). Art. No. 87. ISSN 0004-637X.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Riedel, Adric R.0000-0003-1645-8596
Alam, Munazza K.0000-0003-4157-832X
Rice, Emily L.0000-0002-3252-5886
Cruz, Kelle L.0000-0002-1821-0650
Additional Information:© 2017. The American Astronomical Society. Received 2016 February 23 Accepted 2016 October 7 Published 2017 May 10 All of the observations reported in this paper were obtained with the Southern African Large Telescope (SALT), which is a partnership between the South African Astronomical Observatory and 11 international partners under program codes 2014-1-AMNH-002 and 2014-2-AMNH-002. The generosity of the late Paul Newman and the Newman Foundation has made AMNH's participation in SALT possible. PyRAF is a product of the Space Telescope Science Institute, which is operated by AURA for NASA. A.R.R. would like to thank Noel Richardson for help with flux calibration and RV calibration of the data, Jamie McDonald for editorial assistance, and Michael Shara for help with the data acquisition. Software: Astropy (Astropy Collaboration et al. 2013), LACEwING (Riedel et al. 2016), MATCHSTAR (Riedel et al. 2014), PHEW (Alam & Douglas 2016), PyRAF, PySpecKit (Ginsburg & Mirocha 2011). Facility: SALT (RSS).
Funding AgencyGrant Number
Newman FoundationUNSPECIFIED
Subject Keywords:open clusters and associations: general; solar neighborhood; stars: low-mass; stars: pre-main sequence; techniques: spectroscopic
Issue or Number:2
Record Number:CaltechAUTHORS:20170512-101702974
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Official Citation:Adric R. Riedel et al 2017 ApJ 840 87
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77403
Deposited By: Ruth Sustaita
Deposited On:12 May 2017 19:33
Last Modified:09 Mar 2020 13:18

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