Serendipitous Discovery and Parallax of a Nearby L Dwarf

A field star serendipitously observed in a parallax program proved to have a proper motion of 562 mas/yr and a parallax of 82 +- 2 mas. The star is identified with 2MASS J07003664+3157266. A Keck LRIS spectrum shows its spectral type to be L3.5, as expected from its infrared and optical colors and absolute magnitude. This object had not been previously recognized as an L dwarf, perhaps because of crowding at its relatively low Galactic latitude (b = +15.8 degrees).Comment: PASP, in press. 8 pages incl.2 postscript figures, plus one jpeg figur

Measurement of the partial cross-sections sigmaTT, sigmaLT and sigmaT + epsilon-sigmaL of the p(e,e\u27pion+)n reaction at the Delta(1232) resonance

The partial cross-sections sigmaLT, sigmaTT, and sigmaT+&egr;sigmaL have been measured for the H(e, e\u27pi+)n reaction, at Q 2 = 0.127 (GeV/c)2, W = 1232 MeV and theta piq = 44.45°, in a recent experiment at the MIT/Bates Linear Accelerator Center. The experiment was done with the Bates Out Of Plane Spectrometer system (OOPS) using a high duty factor (\u3e50%) 950 MeV unpolarized electron beam. The One Hundred Inch Proton Spectrometer (OHIPS) detected electrons, and three OOPS modules provided out of plane hadron detection in two sequential sets of simultaneous measurements. The sigmaLT partial cross section is sensitive to the coulombic quadrupole amplitude C2, and can be used to extract the ratio (CMR) of C2 to the dominant magnetic dipole (M1) amplitude, and sigmaTT is similarly sensitive to the electric quadrupole (E2) amplitude and can be used to evaluate the E2 to M1 ratio (EMR). These measurements in the pi+ channel complement pi0 channel measurements of the same responses which were made during the same experiment; the different sensitivities to background terms in the two charge channels will provide increased precision in the CMR and EMR extraction, and permit isospin decomposition of the multipoles

Teaching Lower Laryngeal Position with EMG Biofeedback

The authors explore new and innovative ways to teach singers how to maintain the lower laryngeal position while singing - a component of classical singing technique that many consider essential to achieving a vibrant, focused, and resonant tone