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- W3100654864 abstract "I present a comprehensive study of the MBM 12 young association (MBM 12A). 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 MBM 12A membership that is complete to 0.03 M⊙ (H ∼ 15) for a 175 × 14 field encompassing the MBM 12 cloud. I find five new members with masses of 0.1-0.4 M⊙ 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 MBM 12, 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 MBM 12 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 MBM 12A and other young populations; these data indicate ages of 2−1+3 Myr for MBM 12A and ∼10 Myr for the TW Hya and η Cha associations. MBM 12A 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)." @default.
- W3100654864 created "2020-11-23" @default.
- W3100654864 creator A5087561231 @default.
- W3100654864 date "2001-10-10" @default.
- W3100654864 modified "2023-10-16" @default.
- W3100654864 title "On the MBM 12 Young Association" @default.
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- W3100654864 doi "https://doi.org/10.1086/322386" @default.
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