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162 papers · 1 filter
The Seventh Data Release of the Sloan Digital Sky Survey
K. Abazajian
This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDS…
The Full Spectrum Galactic Terrarium: MHz to TeV Observations of Various Critters
Mallory S. E. Roberts, C. Brogan, S. Ransom +13
Multi-wavelength studies at radio, infrared, optical, X-ray, and TeV wavelengths have discovered probable counterparts to many Galactic sources of GeV emission detected by EGRET. T…
Aetherizing Lambda: Barotropic Fluids as Dark Energy
Eric V. Linder, Robert J. Scherrer
We examine the class of barotropic fluid models of dark energy, in which the pressure is an explicit function of the density, p = f(ρ). Through general physical considerations we c…
The three dimensional dynamic structure of the inner Orion Nebula
C. R. O'Dell, W. J. Henney, N. P. Abel +2
The three dimensional structure of the brightest part of the Orion Nebula is assessed in the light of published and new data. We find that the widely accepted model of a concave bl…
Fundamental Properties of Low-Mass Stars and Brown Dwarfs
Michael C. Liu, Keivan G. Stassun, France Allard +7
Precise measurements of the fundamental properties of low-mass stars and brown dwarfs are key to understanding the physics underlying their formation and evolution. While there has…
A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates
C. J. Cyganowski, B. A. Whitney, E. Holden +12
Using images from the Spitzer GLIMPSE Legacy survey, we have identified more than 300 extended 4.5 micron sources (abbreviated EGO, Extended Green Object, for the common coding of…
A Survey for a Coeval, Comoving Group Associated with HD 141569
Alicia N. Aarnio, Alycia J. Weinberger, Keivan G. Stassun +2
We present results of a search for a young stellar moving group associated with the star HD 141569, a nearby, isolated Herbig AeBe primary member of a 5+/-3 Myr-old triple star sys…
Phantom Dark Energy Models with a Nearly Flat Potential
Robert J. Scherrer, A. A. Sen
We examine phantom dark energy models produced by a field with a negative kinetic term and a potential that satisfies the slow roll conditions: [(1/V)(dV/dphi)]^2 << 1 and (1/V)(d^…
Hilltop Quintessence
Sourish Dutta, Robert J. Scherrer
We examine hilltop quintessence models, in which the scalar field is rolling near a local maximum in the potential, and w is close to -1. We first derive a general equation for the…
On the dangers of using the growth equation on large scales in the Newtonian gauge
James B. Dent, Sourish Dutta
We examine the accuracy of the growth equation , which is ubiquitous in the cosmological literature, in the context of the Newtonian gauge. By comparin…
High Velocity Features in the Orion Nebula
C. R. O'Dell, W. J. Henney
We have used widely spaced in time Hubble Space Telescope images to determine tangential velocities of features associated with outflows from young stars. These observations were s…
A Spectroscopic Orbit for Regulus
D. R. Gies, S. Dieterich, N. D. Richardson +8
We present a radial velocity study of the rapidly rotating B-star Regulus that indicates the star is a single-lined spectroscopic binary. The orbital period (40.11 d) and probable…
Surprising dissimilarities in a newly formed pair of 'identical twin' stars
Keivan G. Stassun, Robert D. Mathieu, Phillip A. Cargile +3
The mass and chemical composition of a star are the primary determinants of its basic physical properties--radius, temperature, luminosity--and how those properties evolve with tim…
Detection of a Hot Subdwarf Companion to the Be Star FY Canis Majoris
Geraldine J. Peters, Douglas R. Gies, Erika D. Grundstrom +1
The rapid rotation of Be stars may be caused in some cases by past mass and angular momentum accretion in an interacting binary in which the mass donor is currently viewed as a sma…
A new perspective on the relation between dark energy perturbations and the late-time ISW effect
James B. Dent, Sourish Dutta, Thomas J. Weiler
The effect of quintessence perturbations on the ISW effect is studied for a mixed dynamical scalar field dark energy (DDE) and pressureless perfect fluid dark matter. A new and gen…
Spatially-resolved Chandra Imaging Spectroscopy of the classical/weak-lined T Tauri system V710 Tau
Sonali J. Shukla, David A. Weintraub, Joel H. Kastner
We present spatially-resolved X-ray observations of the binary T Tauri star system V710 Tau. Using Chandra's Advanced CCD Imaging Spectrometer (ACIS), we imaged this 3.2'' separati…
Stellar Rotation in M35: Mass-Period Relations, Spin-Down Rates, and Gyrochronology
Søren Meibom, Robert D. Mathieu, Keivan G. Stassun
We present the results of a 5 month photometric time-series survey for stellar rotation over a 40'x40' field on the 150 Myr open cluster M35. We report rotation periods for 441 sta…
Evolution of Oscillating Scalar Fields as Dark Energy
Sourish Dutta, Robert J. Scherrer
Oscillating scalar fields, with an oscillation frequency much greater than the expansion rate, have been proposed as models for dark energy. We examine these models, with particula…
Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
M. Kowalski, D. Rubin, G. Aldering +67
We present a new compilation of Type Ia supernovae (SNe Ia), a new dataset of low-redshift nearby-Hubble-flow SNe and new analysis procedures to work with these heterogeneous compi…
Neutral Hydrogen Clouds in the M81/M82 Group
Katie M. Chynoweth, Glen I. Langston, Min S. Yun +3
We have observed a 3 degree x 3 degree area centered on the M81/M82 group of galaxies using the Robert C. Byrd Green Bank Telescope (GBT) in a search for analogs to the High Veloci…
The Pre-Main-Sequence Eclipsing Binary ASAS J052821+0338.5
H. C. Stempels, L. Hebb, K. G. Stassun +4
In this paper we present the first results of a detailed spectroscopic and photometric analysis of the V = 11.7m eclipsing binary ASAS J052821+0338.5. With the FIES spectrograph at…
The Intrinsic Properties of SDSS Galaxies
Ariyeh H. Maller, Andreas A. Berlind, Michael R. Blanton +1
The observed properties of galaxies vary with inclination; for most applications we would rather have properties that are independent of inclination, intrinsic properties. One way…
Quiescent H2 Emission From Pre-Main Sequence Stars in Chamaeleon I
Jeffrey S. Bary, David A. Weintraub, Sonali J. Shukla +2
We report the discovery of quiescent emission from molecular hydrogen gas located in the circumstellar disks of six pre-main sequence stars, including two weak-line T Tauri stars (…
Chemical abundances in six nearby star-forming regions: implications for galactic evolution and planet searches around very young stars
N. C. Santos, C. Melo, D. J. James +3
In this paper we present a study of chemical abundances in six star-forming regions. Stellar parameters and metallicities are derived using high-resolution, high S/N spectra of wea…