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A Revised Calibration of the MV-W(O I 7774) Relationship using Hipparcos Data: Its Application to Cepheids and Evolved Stars

Abstract: A new calibration of the MV {W(O I 7774) relationship has been calculated using better reddening and distance estimates for a sample of 27 calibrator stars of spectral types A to G, based on accurate parallaxes and proper motions from the Hipparcos and Tyc

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Optical Line Profile Variability of the B1+Neutron Star Binary System LS I+65010 (2S 0114+650)

Abstract: We present high-resolution spectroscopic observations of the massive X-ray binary system LS I +65 010 (2S 0114+650) in the optical wavelength region. A correlation between equivalent width and radial velocity of photospheric absorption lines is found. The

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The Optical and Near-Infrared Counterpart of IRAS 18476+2054

Abstract: We present here, for the first time, an optical and near-infrared (NIR) identification for the previously unstudied IRAS PSC source 18476+2054. Direct imaging in BVRICiJKs and optical spectroscopy were obtained. The optical counterpart is identified as a va

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CCD Photometry of the Open Clusters NGC 2658, NGC 2849, and NGC 3247
J. A. Ahumada

Abstract: We present CCD photometry of the galactic open clusters NGC 2658, NGC 2849, and NGC 3247. By means of the comparison between the observed cluster sequences and the Padova theoretical isochrones, we derive the following parameters: for NGC 2658, E(B _V ) =

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Relation between Source and Temperature Fluctuations in Photoionized Nebulae

Abstract: The magnitude of the temperature fluctuations (t2) required to explain the observed inconsistencies between metallicities inferred from recombination lines and from forbidden lines cannot be attained by steady-state equilibrium photoionization models. If,

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Photometry of Fourteen Main Belt Asteroids
R. Gil Hutton

Abstract: The results of CCD photometry of 14 main belt asteroids obtained between 1996 and 2000 are presented. For most of them, the V or R composite lightcurves and the values of the synodic rotational period are derived. There exists no previous determination of

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H2 Velocity Structure in HH 211

Abstract: We describe the velocity structure of the molecular outflow HH211 in the 2.12 Um line of H2. Observations were obtained using an IR Fabry-Pérot interferometer with a spectral resolution of 24 km s_1. It is observed that the eastern lobe of the outflow is b

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Lyngå 1, A Small Open Cluster Containing a Red-Supergiant Member

Abstract: We present CCD UBVRI (Cousins system) photometric observations complemented with spectroscopic and polarimetric observations that were carried out in the open cluster Lynga 1. Our data indicate that the cluster reddening is EB_V = 0:45 _ 0:03, the ratio AV

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VLA Detection of a Double Radio Source at the Center of the HH 288 Quadrupolar Outflow

Abstract: We present high angular resolution (_ 0:``3) VLA observations at 3.5 cm toward the region of the quadrupolar outflow HH 288. Previous VLA observations made at low angular resolution (_ 7``) had revealed the presence of the source VLA2, that is associated w

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Galaxy Formation Simulations with Scalar Field Dark Matter
T. Matos G. Torres

Abstract: We present simulations of galaxy formation using a scalar field cosmological model in which the dark matter is modeled by scalar field . In the Scalar Field Dark Matter (SFDM) model the dark matter consists of an ultra-light particle, with mass m 10_23 eV.

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Additional Atmospheric Opacity Measurements at Millimeter Wavelengths from San Pedro Mártir Sierra in Baja California
D. Hiriart

Abstract: Measurements of the atmospheric zenith opacity at a wavelength of 1.4mm (210 GHz) carried out at the Observatorio Astronómico Nacional in the Sierra San Pedro Mártir, Baja California, México are presented. The data cover 251 days in 1999. Measurements were

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The Radial Velocity Profiles of some Proplyds in the Orion Nebula

Abstract: We use H scanning Fabry-Perot interferometric data on the Orion Nebula in order to study the proplyds of the central region. We find that Fabry-Perot interferometry constitutes an effective technique for the detection and identification of proplyds. Some o

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