Search Publications
Adaptive Optics Observations of 3 µm Water Ice in Silhouette Disks in the Orion Nebula Cluster and M43
Tokunaga, Alan T.; Terada, Hiroshi; Pyo, Tae-Soo +9 more
We present the near-infrared images and spectra of four silhouette disks in the Orion Nebula Cluster (M42) and M43 using the Subaru Adaptive Optics system. While d053-717 and d141-1952 show no water ice feature at 3.1 µm, a moderately deep (τice ~ 0.7) water ice absorption is detected toward d132-1832 and d216-0939. Taking into ac…
Hunting for Young Dispersing Star Clusters in IC 2574
Pellerin, Anne; Harris, Jason; Meyer, Martin M. +1 more
Dissolving stellar groups are very difficult to detect using traditional surface photometry techniques. We have developed a method to find and characterize non-compact stellar systems in galaxies where the young stellar population can be spatially resolved. By carrying out photometry on individual stars, we are able to separate the luminous blue s…
Proper Motions of the HH 110/270 System
Bally, J.; Raga, A. C.; Kajdič, P. +2 more
We present a study of the HH 110/270 system based on three sets of optical images obtained with the ESO New Technology Telescope, the Subaru Telescope, and the Hubble Space Telescope (HST). The ground-based observations are made in the Hα and [S II] emission lines and the HST observations are made in the Hα line only. Ground-based observations rev…
On the Nature of the Hot Component in the Symbiotic, Supersoft X-Ray Binary AG Draconis
Sion, Edward M.; Godon, Patrick; Mikolajewska, Joanna +2 more
AG Dra is a symbiotic variable consisting of a metal-poor, yellow giant mass donor underfilling its Roche lobe and a hot accreting white dwarf, possibly surrounded by an optically thick, bright accretion disk (which could be present from wind accretion). We constructed NLTE synthetic spectral models for white dwarf spectra and optically thick accr…
Orbital-phase-resolved Spectroscopy of the Intermediate Polar FO Aqr Using XMM-Newton Observatory Data
Balman, Ş.; Pekön, Y.
We present the orbital-phase-resolved analysis of an archival FO Aqr observation obtained using the X-ray Multi-Mirror Mission, European Photon Imaging Camera (pn instrument). We investigate the variation of the spin pulse amplitudes over the orbital period in order to account for the effects of orbital motion on spin modulation. The semi-amplitud…
Unveiling the New Generation of Stars in NGC 604 with Gemini-NIRI
Barbá, Rodolfo H.; Fariña, Cecilia; Bosch, Guillermo L.
We present a near-infrared study focused on the detection and characterization of the youngest stellar component of the NGC 604 giant star-forming region in the Triangulum galaxy (M 33). By means of color-color diagrams derived from the photometry of JHKs images taken with the Gemini Near Infrared Imaging and Spectrometer (NIRI), we hav…
A Spitzer-MIPS Search for Dust in Compact High-velocity H I Clouds
Elvis, Martin; Williams, Rik J.; Nicastro, Fabrizio +2 more
We employ three-band Spitzer-MIPS observations to search for cold dust emission in three neutral hydrogen compact high-velocity clouds (CHVCs) in the vicinity of the Milky Way. Far-infrared emission correlated with H I column density was previously reported in HVC Complex C, indicating that this object contains dust heated by the Galactic radiatio…
AKARI/AcuA Physical Studies of the Cybele Asteroid Family
Hasegawa, Sunao; Usui, Fumihiko; Ootsubo, Takafumi +4 more
We present a study of 107 Cybele asteroids based on the archival database "Asteroid Catalog Using AKARI (AcuA)" taken by the Infrared Astronomical Satellite. The database provides diameters D > 10 km, geometric albedos, and taxonomic information (75%) of the Cybeles. We find taxonomic diversity (mainly C-, D-, and P-type) in the population of 7…
High Ionization Species in the Nearby Interstellar Medium from an Exhaustive Analysis of the IUE INES Database
Freire Ferrero, R.; Morales Durán, C.; Halbwachs, J. -L. +1 more
Main-sequence (MS) and giant late-B and early-A type stars are the best targets for searching for nearby interstellar (IS) Si IV and C IV resonance lines because they are not able to produce them, either in atmospheric layers or in their circumstellar environment, and because many stars of these spectral types are nearby and located in the local i…
Structural Parameters for Globular Clusters in the Outer Halo of M31
Ma, Jun; Wang, Song
In this paper, we present internal surface brightness profiles, using images in the F606W and F814W filter bands observed with the Advanced Camera for Surveys on the Hubble Space Telescope, for 10 globular clusters (GCs) in the outer halo of M31. Standard King models are fitted to the profiles to derive their structural and dynamical parameters. T…