A Survey for a Coeval, Comoving Group Associated with HD 141569

Abstract

We present results of a search for a young stellar moving group associated with the star HD 141569, a nearby, isolated Herbig AeBe primary member of a 5+/-3 Myr-old triple star system on the outskirts of the Sco-Cen complex. Our spectroscopic survey identified a population of 21 Li-rich, <30 Myr-old stars within 30 degrees of HD 141569 which possess similar proper motions with the star. The spatial distribution of these Li-rich stars, however, is not suggestive of a moving group associated with the HD 141569 triplet, but rather this sample appears cospatial with Upper Scorpius and Upper Centaurus Lupus. We apply a modified moving cluster parallax method to compare the kinematics of these youthful stars with Upper Scorpius and Upper Centaurus Lupus. Eight new potential members of Upper Scorpius and five new potential members of Upper Centaurus Lupus are identified. A substantial moving group with an identifiable nucleus within 15 degrees (~30 pc) of HD 141569 is not found in this sample. Evidently, the HD 141569 system formed ~5 Myr ago in relative isolation, tens of parsecs away from the recent sites of star formation in the Ophiucus-Scorpius-Centaurus region.

33 pages, 5 tables, 7 figures. Accepted for publication in the Astronomical Journal

References in corpus (19)

• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• The VizieR database of Astronomical Catalogues
• A Hipparcos census of the nearby OB associations
• The second US Naval Observatory CCD Astrograph Catalog (UCAC2)
• Dynamical Masses of T Tauri Stars and Calibration of PMS Evolution
• Discovery of seven T Tauri stars and a brown dwarf candidate in the nearby TW Hydrae Association
• Post-T Tauri Stars in the Nearest OB Association
• The Circumstellar Disk of HD 141569 Imaged with NICMOS
• A Moving Cluster Distance to the Exoplanet 2M1207 B in the TW Hya Association
• A Hipparcos study of the Hyades open cluster: Improved colour-absolute magnitude and Hertzsprung-Russell diagrams
• Astrometric radial velocities III. Hipparcos measurements of nearby star clusters and associations
• On the Distance to the Ophiuchus Star-Forming Region
• Membership, lithium, and metallicity in the young open clusters IC 2602 and IC 2391: enlarging the sample
• Evolution of Mid-IR Excess Around Sun-like Stars: Constraints on Models of Terrestrial Planet Formation
• Dynamical Mass Constraints on Low-Mass Pre-Main-Sequence Stellar Evolutionary Tracks: An Eclipsing Binary in Orion with a 1.0 Msun Primary and an 0.7 Msun Secondary
• Study of the properties and spectral energy distributions of the Herbig AeBe stars HD 34282 and HD 141569
• Stellar Companions and the Age of HD 141569 and its Circumstellar Disk
• A refurbished convergent point method for finding moving groups in the Hipparcos Catalogue
• A Dynamical Mass Constraint for Pre-Main-Sequence Evolutionary Tracks: The Binary NTT 045251+3016

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• The VLT/NaCo Large program to probe the occurrence of exoplanets and brown dwarfs in wide orbits: I- Sample definition and characterization
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• Multiplicity of disc-bearing stars in Upper Scorpius and Upper Centaurus-Lupus
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• The Matryoshka Disk: Keck/NIRC2 Discovery of a Solar System-Scale, Radially Segregated Residual Protoplanetary Disk Around HD 141569A
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