Search Publications
An All-sky Catalog of Bright M Dwarfs
Gaidos, Eric; Lépine, Sébastien
We present an all-sky catalog of M dwarf stars with apparent infrared magnitude J < 10. The 8889 stars are selected from the ongoing SUPERBLINK survey of stars with proper motion µ > 40 mas yr-1, supplemented on the bright end with the Tycho-2 catalog. Completeness tests which account for kinematic (proper motion) bias sugge…
Young Planetary Nebulae: Hubble Space Telescope Imaging and a New Morphological Classification System
Morris, Mark R.; Sahai, Raghvendra; Villar, Gregory G.
Using Hubble Space Telescope images of 119 young planetary nebulae (PNs), most of which have not previously been published, we have devised a comprehensive morphological classification system for these objects. This system generalizes a recently devised system for pre-planetary nebulae, which are the immediate progenitors of PNs. Unlike previous c…
The Relationships among Compact Stellar Systems: A Fresh View of Ultracompact Dwarfs
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean P. +1 more
We use a combined imaging and spectroscopic survey of the nearby central cluster galaxy, M87, to assemble a sample of 34 confirmed ultracompact dwarfs (UCDs) with half-light radii of gsim10 pc measured from Hubble Space Telescope images. This doubles the existing sample in M87, making it the largest such sample for any galaxy, while extending the …
Star Clusters in M31. II. Old Cluster Metallicities and Ages from Hectospec Data
Caldwell, Nelson; Harding, Paul; Rose, James A. +2 more
We present new high signal-to-noise spectroscopic data on the M31 globular cluster (GC) system, obtained with the Hectospec multifiber spectrograph on the 6.5 m MMT. More than 300 clusters have been observed at a resolution of 5 Å and with a median S/N of 75 per Å, providing velocities with a median uncertainty of 6 km s-1. The primary …
The Southern Proper Motion Program. IV. The SPM4 Catalog
Beers, Timothy C.; Lee, Young Sun; Casetti-Dinescu, Dana I. +8 more
We present the fourth installment of the Yale/San Juan Southern Proper Motion Catalog, SPM4. The SPM4 contains absolute proper motions, celestial coordinates, and B, V photometry for over 103 million stars and galaxies between the south celestial pole and -20° declination. The catalog is roughly complete to V = 17.5 and is based on photographic an…
Distance Scale Zero Points from Galactic RR Lyrae Star Parallaxes
Kochukhov, Oleg; Nelan, Edmund P.; Freedman, Wendy L. +15 more
We present new absolute trigonometric parallaxes and proper motions for seven Population II variable stars—five RR Lyr variables: RZ Cep, XZ Cyg, SU Dra, RR Lyr, and UV Oct; and two type 2 Cepheids: VY Pyx and κ Pav. We obtained these results with astrometric data from Fine Guidance Sensors, white-light interferometers on Hubble Space Telescope. W…
Star Clusters in M31. V. Internal Dynamical Trends: Some Troublesome, Some Reassuring
Caldwell, Nelson; Strader, Jay; Seth, Anil C.
We present internal velocity dispersions and precise radial velocities for 200 globular clusters (GCs) in M31 that are derived using new high-resolution spectra from MMT/Hectochelle. Of these, 163 also have King model structural parameters that allow us to estimate their mass-to-light ratios. This is, by far, the largest such data set available fo…
The Nuclear Structure in Nearby Luminous Infrared Galaxies: Hubble Space Telescope NICMOS Imaging of the GOALS Sample
Sanders, D. B.; Surace, J. A.; Inami, H. +16 more
We present results of Hubble Space Telescope (HST) NICMOS H-band imaging of 73 of the most luminous (i.e., log[L IR/L sun]>11.4) infrared galaxies (LIRGs) in the Great Observatories All-sky LIRG Survey. This data set combines multi-wavelength imaging and spectroscopic data from space-based (Spitzer, HST, GALEX, and Chandra…
Dust Heating Sources in Galaxies: The Case of M33 (HERM33ES)
Boquien, M.; Calzetti, D.; van der Werf, P. +8 more
Dust emission is one of the main windows to the physics of galaxies and to star formation as the radiation from young, hot stars is absorbed by the dust and reemitted at longer wavelengths. The recently launched Herschel satellite now provides a view of dust emission in the far-infrared at an unequaled resolution and quality up to 500 µm. In…
The Be Star Spectra (BeSS) Database
Neiner, C.; Floquet, M.; de Batz, B. +3 more
Be stars vary on many timescales, from hours to decades. A long time base of observations to analyze certain phenomena in these stars is therefore necessary. Collecting all existing and future Be star spectra into one database has thus emerged as an important tool for the Be star community. Moreover, for statistical studies, it is useful to have c…