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Title:
Nearby Young Stars Selected by Proper Motion. I. Four New Members of the β Pictoris Moving Group From The Tycho-2 Catalog
Authors:
Lépine, Sébastien; Simon, Michal
Affiliation:
AA(Department of Astrophysics, Division of Physical Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA ), AB(Department of Physics and Astronomy, State University of New York, Stony Brook, NY 11794, USA; Visiting astronomer, NASA Infrared Telescope Facility (IRTF). )
Publication:
The Astronomical Journal, Volume 137, Issue 3, pp. 3632-3645 (2009). (AJ Homepage)
Publication Date:
03/2009
Origin:
IOP
Astronomy Keywords:
astrometry, stars: emission-line, Be, stars: kinematics, stars: pre-main sequence, open clusters and associations: individual: Beta Pictoris Moving Group
DOI:
10.1088/0004-6256/137/3/3632
Bibliographic Code:
2009AJ....137.3632L

Abstract

We describe a procedure to identify stars from nearby moving groups and associations out of catalogs of stars with large proper motions. We show that from the mean motion vector of a known or suspected moving group, one can identify additional members of the group based on proper motion data and photometry in the optical and infrared, with minimal contamination from background field stars. We demonstrate this technique by conducting a search for low-mass members of the β Pictoris moving group in the Tycho-2 catalog. All known members of the moving group are easily recovered, and a list of 51 possible candidates is generated. Moving group membership is evaluated for 33 candidates based on X-ray flux from ROSAT, Hα line emission, and radial velocity measurement from high-resolution infrared spectra obtained at Infrared Telescope Facility. We confirm three of the candidates to be new members of the group: TYC 1186-706-1, TYC 7443-1102-1, and TYC 2211-1309-1 which are late-K and early-M dwarfs 45-60 pc from the Sun. We also identify a common proper motion companion to the known β Pictoris Moving Group member TYC 7443-1102-1, at a 26farcs3 separation; the new companion is associated with the X-ray source 1RXS J195602.8 - 320720. We argue that the present technique could be applied to other large proper motion catalogs to identify most of the elusive, low-mass members of known nearby moving groups and associations.

Based on data obtained in part with the 2.4 m Hiltner telescope of the MDM observatory. Based on data obtained in part with the CTIO 1.5 m telescope, operated by SMARTS, the Small and Medium Aperture Telescope System consortium, under contract with the Associated Universities for Research in Astronomy (AURA).

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