Search Publications
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…
First Orbit and Mass Determinations for Nine Visual Binaries
Ling, J. F.
This paper presents the first published orbits and masses for nine visual double stars: WDS 00149-3209 (B 1024), WDS 01006+4719 (MAD 1), WDS 03130+4417 (STT 51), WDS 04357+3944 (HU 1084), WDS 19083+2706 (HO 98 AB), WDS 19222-0735 (A 102 AB), WDS 20524+2008 (HO 144), WDS 21051+0757 (HDS 3004 AB), and WDS 22202+2931 (BU 1216). Masses were calculated…
Chandra Observations of the Nuclear Star Cluster and Ultraluminous X-Ray Sources in NGC 2139
Böker, Torsten; Ho, Luis C.; Shields, Joseph C. +3 more
We report Chandra observations of the Scd galaxy NGC 2139, which is known to host a recently formed (107.6 yr) nuclear star cluster. The star cluster is undetected in X-rays, with an upper bound on 0.5-7 keV luminosity of L X < 7.1 × 1037 erg s-1. This bound implies a bolometric accretion luminosity &…