A REVISED AGE FOR UPPER SCORPIUS AND THE STAR FORMATION HISTORY AMONG THE F-TYPE MEMBERS OF THE SCORPIUS–CENTAURUS OB ASSOCIATION

@article{Pecaut2011ARA,
  title={A REVISED AGE FOR UPPER SCORPIUS AND THE STAR FORMATION HISTORY AMONG THE F-TYPE MEMBERS OF THE SCORPIUS–CENTAURUS OB ASSOCIATION},
  author={Mark J. Pecaut and Eric E. Mamajek and Eric Bubar},
  journal={The Astrophysical Journal},
  year={2011},
  volume={746}
}
We present an analysis of the ages and star formation history of the F-type stars in the Upper Scorpius (US), Upper Centaurus–Lupus (UCL), and Lower Centaurus–Crux (LCC) subgroups of Scorpius–Centaurus (Sco-Cen), the nearest OB association. Our parent sample is the kinematically selected Hipparcos sample of de Zeeuw et al., restricted to the 138 F-type members. We have obtained classification-resolution optical spectra and have also determined the spectroscopic accretion disk fraction. With… 

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References

SHOWING 1-10 OF 103 REFERENCES

The History of Low-Mass Star Formation in the Upper Scorpius OB Association

We use a large sample of about 100 low-mass pre–main-sequence (PMS) stars in the Upper Scorpius OB association to explore the star formation history and the initial mass function of this association.

A Large-Area Search for Low-Mass Objects in Upper Scorpius. II. Age and Mass Distributions

We present continued results from a wide-field, ~150 deg2, optical photometric and spectroscopic survey of the northern part of the ~5 Myr old Upper Scorpius OB association. Photometry and spectral

Some Characteristics of the B and A Stars in the Upper Scorpius Complex

More accurate spectral classifications from new McDonald spectrograms are given for seventy-five Henry Draper B0-B9 stars in the region of the Upper Scorpius part of the Scorpio-Centaurus

Post-T Tauri Stars in the Nearest OB Association

We present results of a spectroscopic survey of X-ray– and proper-motion–selected samples of late-type stars in the Lower Centaurus–Crux (LCC) and Upper Centaurus–Lupus (UCL) subgroups of the nearest

Exploring the Full Stellar Population of the Upper Scorpius OB Association

We investigate the stellar population and star formation history of the Upper Scorpius OB association, the most nearby region of recent massive star formation, over the full stellar mass range from

Herbig Ae/Be Stars in nearby OB Associations

We have carried out a study of the early-type stars in nearby OB associations spanning an age range of ∼3–16 Myr, with the aim of determining the fraction of stars that belong to the Herbig Ae/Be

Evidence for Mass-dependent Circumstellar Disk Evolution in the 5 Myr Old Upper Scorpius OB Association

We present 4.5, 8, and 16 μm photometry from the Spitzer Space Telescope for 204 stars in the Upper Scorpius OB association. The data are used to investigate the frequency and properties of

Discovery of a Wide Companion near the Deuterium-burning Mass Limit in the Upper Scorpius Association

We present the discovery of a companion near the deuterium-burning mass limit located at a very wide distance, at an angular separation of 4.6″ ± 0.1″ (projected distance of ~ 670 AU) from UScoCTIO

THE INITIAL MASS FUNCTION AND DISK FREQUENCY OF THE ρ OPHIUCHI CLOUD: AN EXTINCTION-LIMITED SAMPLE

We have completed an optical spectroscopic survey of an unbiased, extinction-limited sample of candidate young stars covering 1.3 deg2 of the ρ Ophiuchi star-forming region. While infrared, X-ray,

DISCOVERY OF AN ∼23 MJup BROWN DWARF ORBITING ∼700 AU FROM THE MASSIVE STAR HIP 78530 IN UPPER SCORPIUS

We present the discovery of a substellar companion on a wide orbit around the ∼ 2.5 M☉ star HIP 78530, which is a member of the 5 Myr old Upper Scorpius association. We have obtained follow-up
...