On the MBM12 Young Association

Abstract

I present a comprehensive study of the MBM12 young association (MBM12A). By combining infrared (IR) photometry from the Two-Micron All-Sky Survey (2MASS) survey with new optical imaging and spectroscopy, I have performed a census of the MBM12A membership that is complete to 0.03 Msun (H~15) for a 1.75deg X 1.4deg field encompassing the MBM12 cloud. I find five new members with masses of 0.1-0.4 Msun and a few additional candidates that have not been observed spectroscopically. From an analysis of optical and IR photometry for stars in the direction of MBM12, I identify M dwarfs in the foreground and background of the cloud. By comparing the magnitudes of these stars to those of local field dwarfs, I arrive at a distance modulus 7.2+/-0.5 (275 pc) to the MBM12 cloud; it is not the nearest molecular cloud and is not inside the local bubble of hot ionized gas as had been implied by previous distance estimates of 50-100 pc. I have also used Li strengths and H-R diagrams to constrain the absolute and relative ages of MBM12A and other young populations; these data indicate ages of 2 +3/-1 Myr for MBM12A and 10 Myr for the TW Hya and Eta Cha associations. MBM12A may be a slightly evolved version of the aggregates of young stars within the Taurus dark clouds (~1 Myr) near the age of the IC 348 cluster (~2 Myr).

to be published in The Astrophysical Journal, 41 pages, 14 figures, also found at http://cfa-www.harvard.edu/sfgroup/preprints.html

References in corpus (4)

• Color Transformations for the 2MASS Second Incremental Data Release
• Circumstellar Disks in the IC 348 Cluster
• Membership, lithium, and metallicity in the young open clusters IC 2602 and IC 2391: enlarging the sample
• Protoplanetary Disks in the Nearest Star-Forming Cloud: Mid-Infrared Imaging and Optical Spectroscopy of MBM 12 Members

Cited by in corpus (44)

• A Census of the Young Cluster IC 348
• Rapid Formation of Molecular Clouds and Stars in the Solar Neighborhood
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• The Stellar Population of the Chamaeleon I Star-Forming Region
• A Census of the Chamaeleon I Star-Forming Region
• A Large Catalog of Accurate Distances to Molecular Clouds from PS1 Photometry
• A Catalog of Young Stellar Groups and Clusters Within 1kpc of the Sun
• The AllWISE Motion Survey and The Quest for Cold Subdwarfs
• A VLT/NACO Survey for Triple and Quadruple Systems among Visual Pre-Main Sequence Binaries
• A Combined Spitzer and Chandra Survey of Young Stellar Objects in the Serpens Cloud Core
• FUSE Survey of the Local Interstellar Medium within 200 Parsec
• On the kinematic evolution of young local associations and the Sco-Cen complex
• Spectroscopy of Candidate Members of the Eta Cha and MBM12 Young Associations
• Suzaku Observations of the Local and Distant Hot ISM
• A Survey of OVI Absorption in the Local Interstellar Medium
• The Trouble with the Local Bubble
• Low Mass Stars and Substellar Objects in the NGC 1333 Molecular Cloud
• Keck Adaptive Optics Imaging of Nearby Young Stars: Detection of Close Multiple Systems
• Discovery of an Edge-On Disk in the MBM 12 Young Association
• Chandra Observations of MBM12 and Models of the Local Bubble
• Rapid Evolution of the Innermost Dust Disk of Protoplanetary Disks Surrounding Intermediate-mass Stars
• Adaptive optics imaging of the MBM 12 association
• MBM 12: young protoplanetary discs at high galactic latitude
• Bird's eye view of molecular clouds in the Milky Way: I. Column density and star formation from sub-pc to kpc scales
• Multiwavelength study of the high-latitude cloud L1642: chain of star formation
• High spatial resolution optical imaging of the multiple T Tauri system LkHα 262/LkHα 263
• Kinematics of the Scorpius-Centaurus OB Association
• Detection of Molecular Hydrogen Emission Associated with LkHalpha 264
• Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4-77.8
• The IC2118 association: new T Tauri stars in high-latitude molecular clouds
• Interferometric Observations of the T Tauri Stars in the MBM 12 Cloud
• Polarization of seven MBM clouds at high galactic latitude
• Indications for grain growth and mass decrease in cold dust disks around Classical T Tauri stars in the MBM 12 young association
• Millimeter-wave Searches for Cold Dust and Molecular Gas around T Tauri Stars in MBM 12
• High-Latitude Molecular Clouds as gamma-ray Sources for GLAST
• High-resolution HI and CO observations of high-latitude intermediate-velocity clouds
• Optical and Near-Infrared Excesses are Correlated in T Tauri Stars
• Planck Galactic Cold Clumps at High Galactic Latitude-A Study with CO Lines
• Kinematic Peculiarities of Gould Belt Stars
• AzTEC 1.1 mm Observations of the MBM12 Molecular Cloud
• A Photometric Study of Stars in the MBM 12 Association
• A candidate protostellar object in the L1457 / MBM12 cloud
• Nature of Faint Companions to G type Stars using Adaptive Optics
• Molecular gas and stars in the translucent cloud MBM 18 (LDN 1569)