Cited by 138Astrophysics and Star Formation StudiesStellar, planetary, and galactic studiesAstronomy and Astrophysical Research

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A MAGELLAN MIKE AND SPITZER MIPS STUDY OF 1.5-1.0 M☉STARS IN SCORPIUS-CENTAURUS

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Abstract

We obtained Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS) 24 μm and 70 μm observations of 182 nearby, Hipparcos F-and G-type common proper motion single and binary systems in the nearest OB association, Scorpius-Centaurus.We also obtained Magellan/MIKE R ∼ 50,000 visual spectra at 3500-10500 Å for 181 candidate ScoCen stars in single and binary systems.Combining our MIPS observations with those of other ScoCen stars in the literature, we estimate 24 μm F+G-type disk fractions of 9/27 (33% ± 11%), 21/67 (31% ± 7%), and 25/71 (35% ± 7%) for Upper Scorpius (∼10 Myr), Upper Centaurus Lupus (∼15 Myr), and Lower Centaurus Crux (∼17 Myr), respectively.We confirm previous IRAS and MIPS excess detections and present new discoveries of 41 protoplanetary and debris disk systems, with fractional infrared luminosities ranging from L IR /L * = 10 -5 to 10 -2 and grain temperatures ranging from T gr = 40-300 K.We searched for an increase in 24 μm excess at an age of 15-20 Myr, consistent with the onset of debris production predicted by coagulation N-body simulations of outer planetary systems.We found such an increase around 1.5 M stars but discovered a decrease in the 24 μm excess around 1.0 M stars.We additionally discovered that the 24 μm excess around 1.0 M stars is larger than predicted by self-stirred models.Finally, we found a weak anti-correlation between fractional infrared luminosity (L IR /L * ) and chromospheric activity (R HK ), that may be the result of differences in stellar properties, such as mass, luminosity, and/or winds.

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Research works printed but not linked: 15

  1. Baraffe, 1998, A&A, 337, 403
  2. Cannon, 1919, Ann. Astron. Obs. Harv. Coll., 94, 1
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  6. Houk, 1982, Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars, 3
  7. Houk, 1988, Michigan Catalogue of Two-Dimensional Spectral Types for the HD Stars, 4
  8. Kennedy, 2010, MNRAS, 405, 1253
  9. Pecaut, 2011, ApJ
  10. Preibisch, 2008, Handbook of Low Mass Star Forming Regions Vol. II, The Southern Sky, 239
  11. Siess, 1997, A&A, 324, 556
  12. Spencer-Jones, 1939, Catalogue of 20,554 Faint Stars in the Cape Astrographic Zone –40° to –52° for the Equinox of 1900.0 (Royal Observatory Cape of Good Hope)
  13. Stock, 1972, Publ. Obs. Astron. Nacional, Cerro Calan, 2, 59
  14. Su, 2010, BAAS, 42, 349
  15. Voges, 1999, A&A, 349, 389

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Metadata

Authors
Chen, C. H., Mamajek, E. E., Bitner, M. A., Pecaut, M., Su, K. Y. L., & Weinberger, A. J.
Affiliations
  • Space Telescope Science Institute (US)
  • University of Rochester (US)
  • University of Arizona (US)
  • Carnegie Institution for Science (US)
Venue
The Astrophysical Journal
Published
2011-08-18
Volume
738
Issue
2
Pages
122
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
OpenAlex
W2068806560
Cited by
138
References
86
Citations by year
2026: 3 · 2025: 2 · 2023: 6 · 2022: 4 · 2021: 5 · 2020: 13 · 2019: 6 · 2018: 13 · 2017: 11 · 2016: 15 · 2015: 16 · 2014: 13 · 2013: 17 · 2012: 14
FWCI
7.34
Type
journal article
Language
he
Open access
Locations
The Astrophysical Journal (publishedVersion)
Funders
  • National Aeronautics and Space Administration
  • California Institute of Technology
  • Jet Propulsion Laboratory
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
Keywords
Scorpius-Centaurus OB association, protoplanetary disks, debris disks, disk fraction, stellar ages, Upper Scorpius, Upper Centaurus Lupus, Lower Centaurus Crux, chromospheric activity, stellar winds, binary stars

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