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Infrared and Millimetric Study of the Young Outflow Cepheus E
Cernicharo, José; Testi, Leonardo; Molinari, Sergio +3 more
The Cepheus E outflow has been studied in the mid- and far-IR using the ISOCAM and Long Wavelength Spectrometer (LWS) instruments and at millimetric wavelengths using the Owens Valley Radio Observatory (OVRO). In the near- and mid-IR, its morphology is similar to that expected for a jet-driven outflow, where the leading bow shocks entrain and acce…
Deep Hubble Space Telescope imaging surveys and the formation of spheroidal galaxies
Franceschini, Alberto; Rodighiero, Giulia; Fasano, Giovanni
We have extended our previous analysis of morphologically selected elliptical and S0 galaxies in the Hubble Deep Field (HDF) North to include Hubble Space Telescope (HST) data in the HDF South and the HDFS-NICMOS areas. Our final sample amounts to 69 E/S0 galaxies with K<20.15 over an area of 11arcmin2. Although a moderately small nu…
Deep Hubble Space Telescope WFPC2 Photometry of M31's Thick Disk (?)
Sarajedini, Ata; Van Duyne, Jeffrey
We present deep color-magnitude diagrams (CMDs) for a field along the outer disk of M31 based on archival Hubble Space Telescope Wide Field Planetary Camera 2 observations in the F555W (~V) and F814W (~I) filters. The CMDs, which contain a total of about 50,000 stars, feature a prominent red giant branch (RGB) along with a significant population o…
2D modelling of the light distribution of early-type galaxies in a volume-limited sample - II. Results for real galaxies
D'Onofrio, M.
In this paper we analyse the results of the two-dimensional (2D) fit of the light distribution of 73 early-type galaxies belonging to the Virgo and Fornax clusters, a sample volume- and magnitude-limited down to MB=-17.3, and highly homogeneous. In our previous paper (Paper I) we have presented the adopted 2D models of the surface-brigh…
Hubble Space Telescope Spectroscopy of the Dwarf Nova RX Andromedae. I. The Underlying White Dwarf
Szkody, Paula; Sion, Edward M.; Cheng, F. H. +3 more
We obtained Hubble Space Telescope Goddard High Resolution Spectrograph phase-resolved spectroscopic observations of the dwarf nova RX Andromedae at three times in its outburst cycle: (1) near the end of an extraordinarily deep and long dwarf nova quiescence, 3 months after the last outburst; (2) during the rise to outburst; and (3) near the end o…
An active binary XY UMa revisited
Chochol, D.; Vittone, A. A.; Errico, L. +4 more
New extensive multicolour photoelectric photometry, performed since 1994, is presented. 17 more-or-less complete light curves were obtained and analyzed. The Wilson-Devinney code applied to the BVRI light curves without the maculation effect together with published spectroscopic mass ratio and semi-major axis yielded new absolute parameters of the…
Modeling Mid-Ultraviolet Spectra. I. Temperatures of Metal-poor Stars
Dorman, Ben; Rood, Robert T.; Peterson, Ruth C.
Determining the properties of remote globular clusters and elliptical galaxies using evolutionary population synthesis requires a library of reliable model stellar fluxes. Empirical libraries are limited to spectra of stars in the solar neighborhood, with nearly solar abundances and abundance ratios. We report here a first step toward providing a …
The composition of circumstellar gas and dust in 51 Oph
Waters, L. B. F. M.; van den Ancker, M. E.; Meeus, G. +2 more
We analyze ISO archive data of the nearby bright emission-line star 51 Oph, previously classified as a proto-planetary system similar to beta Pic. The infrared spectrum reveals the presence of gas-phase emission bands of hot ( ~ 850 K) CO, CO_2, H_2O and NO. In addition to this, partially crystalline silicate dust is present. The solid-state bands…
Time-resolved Hubble Space Telescope Spectroscopy of Four Eclipsing Magnetic Cataclysmic Variables
Schmidt, Gary D.; Stockman, H. S.
Time-resolved, multiepoch, Hubble Space Telescope ultraviolet eclipse spectrophotometry is presented for the magnetic cataclysmic variables (MCVs) V1309 Ori, MN Hya, V2301 Oph, and V1432 Aql. Separation of the eclipse light curves into specific wavebands allows the multiple emission components to be distinguished. Accretion-heated photospheric spo…
Optical spectroscopy of X-Mega targets - II. The massive double-lined O-type binary HD 93205
Morel, T.; Rauw, G.; Barbá, R. H. +8 more
A new high-quality set of orbital parameters for the O-type spectroscopic binary HD 93205 has been obtained combining échelle and coudé CCD observations. The radial velocity orbits derived from the Heii λ4686Å (primary component) and Hei λ4471Å (secondary component) absorption lines yield semi-amplitudes of 133+/-2 and 314+/-2kms-1 for …