Philip C. Myers

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This paper studies the dynamical evolution of young groups/clusters, with N = 100 − 1000 members, from their embedded stage out to ages of ∼ 10 Myr. We use N -body simulations to explore how their evolution depends on the system size N and the initial conditions. Motivated by recent observations suggesting that stellar groups begin their evolution with(More)
One of the central goals of the Spitzer Legacy Project ‘‘FromCores to Disks’’ (c2d) is to determine the frequency of circumstellar disks aroundweak-line T Tauri stars (WTTSs) and to study the properties and evolutionary status of these disks.Herewe present a census of disks for a sample of over 230WTTSs located in the c2d IRACandMIPSmaps of the Ophiuchus,(More)
Crucial steps in the formation of stars and planets can be studied only at midto far-infrared wavelengths, where the Space Infrared Telescope (SIRTF) provides an unprecedented improvement in sensitivity. We will use all three SIRTF instruments (Infrared Array Camera [IRAC], Multiband Imaging Photometer for SIRTF [MIPS], and Infrared Spectrograph [IRS]) to(More)
We present an analysis of K–band stellar distributions for the young stellar clusters GGD 12-15, IRAS 20050+2720, and NGC 7129, which range in far-IR luminosity from 227 to 5.68 ×103 L⊙ and are all still associated with their natal molecular clouds. The data used for this analysis includes near-IR data obtained with FLAMINGOS on the MMT Telescope and newly(More)
OBJECTIVES The aim of this study was to examine the suitability of nurse practitioners for assessing and managing urgent clinical problems presenting in primary care. METHODS Patients registered at a suburban group practice presenting with acute medical problems were offered the choice of seeing a GP or a nurse practitioner. The outcomes of 1000(More)
The c2d Spitzer Legacy project obtained images and photometry with both IRAC and MIPS instruments for five large, nearby molecular clouds. Three of the clouds were also mapped in dust continuum emission at 1.1 mm, and optical spectroscopy has been obtained for some clouds. This paper combines information drawn from studies of individual clouds into a(More)
Millimeter wavelength observations are presented of NGC 1333 IRAS 4, a group of highly-embedded young stellar objects in Perseus, that reveal motions of infall, outflow, rotation, and turbulence in the dense gas around its two brightest continuum objects, 4A and 4B. These data have finest angular resolution of ∼2 (0.0034 pc) and finest velocity resolution(More)
We examine the properties of embedded clusters within 1 kiloparsec using new data from the Spitzer Space Telescope, as well as recent results from 2MASS and other ground-based near-infrared surveys. We use surveys of entire molecular clouds to understand the range and distribution of cluster membership, size and surface density. The Spitzer data demonstrate(More)
We present the first Spitzer Infrared Spectrograph observations of the disks around classical T Tauri stars: spectra in the 5.2-30 μm range of six stars. The spectra are dominated by emission features from amorphous silicate dust, and a continuous component from 5 to 8 μm that in most cases comprises an excess above the photosphere throughout our spectral(More)