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ISO observations of obscured Asymptotic Giant Branch stars in the Large Magellanic Cloud
Waters, L. B. F. M.; Blommaert, J. A. D. L.; van Loon, J. Th. +8 more
We present ISO photometric and spectroscopic observations of a sample of 57 bright Asymptotic Giant Branch stars and red supergiants in the Large Magellanic Cloud, selected on the basis of IRAS colours indicative of high mass-loss rates. PHOT-P and PHOT-C photometry at 12, 25 and 60 mu m and CAM photometry at 12 mu m are used in combination with q…
A 1.4-GHz survey of the southern European Large-Area ISO Survey region
Genzel, R.; Cesarsky, C.; Danese, L. +13 more
A deep survey of the European Large-Area ISO Survey (ELAIS) field in the southern celestial hemisphere (hereinafter S1) has been carried out with the Australia Telescope Compact Array (ATCA) at 1.4 GHz. The S1 region, covering about 4 deg^2, has also been surveyed in the mid- and far-infrared (5-200 µm) with the Infrared Space Observatory (I…
Correlated Errors in HIPPARCOS Parallaxes toward the Pleiades and the Hyades
Gould, Andrew; Narayanan, Vijay K.
We show that the errors in the Hipparcos parallaxes toward the Pleiades and the Hyades open clusters are spatially correlated over angular scales of 2°-3°, with an amplitude of up to 2 mas. This correlation is stronger than expected based on the analysis of the Hipparcos catalog. We predict the parallaxes of individual cluster members, πpm
Strong H_2O and high-J CO emission towards the Class 0 protostar L1448-mm
Liseau, R.; White, G. J.; Benedettini, M. +9 more
The spectrum of the Class 0 source L1448-mm has been measured over the wavelength range extending from 6 to 190 mu m with the Long Wavelength Spectrometer (LWS) and the Short Wavelength Spectrometer (SWS) on the Infrared Space Observatory (ISO). The far infrared spectrum is dominated by strong emission from gaseous H_2O and from CO transitions wit…
Gravitationally Lensed Gamma-Ray Bursts as Probes of Dark Compact Objects
Hurley, K.; Norris, J. P.; Marani, G. F. +2 more
If dark matter in the form of compact objects comprises a large fraction of the mass of the universe, then gravitational lensing effects on gamma-ray bursts are expected. We utilize BATSE and Ulysses data to search for lenses of different mass ranges, which cause lensing in the milli, pico, and femto regimes. Null results are used to set weak limi…
Hubble Space Telescope observations of the Martian aphelion cloud belt prior to the Pathfinder mission: Seasonal and interannual variations
Wolff, Michael J.; James, Philip B.; Lee, Steven W. +1 more
The presence of a globally extant equatorial belt of water ice clouds on Mars is quantitatively investigated using data from three seasons of our Hubble Space Telescope synoptic monitoring program (1993-1997). A subset of the 1996-1997 images covers the landing site of the Mars Pathfinder including a set of images taken after touchdown. Using mult…
Infrared emission of hot water in the atmosphere of Mira
Yamamura, I.; de Jong, T.; Cami, J.
The ISO/SWS spectrum of
Heliospheric interstellar H temperature from SOHO/SWAN H cell data
Schmidt, W.; Bertaux, J. -L.; Lallement, R. +3 more
We show a first comparison between selected SOHO/SWAN H cell data recorded in 1996-1997 and a simple classical ``hot model'' of the interstellar (IS) H flow in the inner heliosphere. Our goal is to obtain some constraints on the interplanetary background Ly-alpha profiles, for the first time without any assumption on the H cell characteristics. Fo…
The Young Age of the Extremely Metal-deficient Blue Compact Dwarf Galaxy SBS 1415+437
Thuan, Trinh X.; Izotov, Yuri I.; Foltz, Craig B.
We use Multiple Mirror Telescope (MMT) spectrophotometry and Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) spectra and Wide Field and Planetary Camera 2 (WFPC2) V and I images to study the properties and evolutionary status of the nearby (D=11.4 Mpc) extremely metal-deficient blue compact dwarf (BCD) galaxy SBS 1415+437 (≡CG 389). T…
The Extragalactic Distance Scale Key Project. XVIII. The Discovery of Cepheids and a New Distance to NGC 4535 Using the Hubble Space Telescope
Kelson, D. D.; Ford, H. C.; Ferrarese, L. +23 more
We report on the discovery of Cepheids in the Virgo spiral galaxy NGC 4535, based on observations made with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope (HST). NGC 4535 is one of 18 galaxies observed as a part of The HST Key Project on the Extragalactic Distance Scale, which aims to measure the Hubble constant to 10% a…