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Intense molecular emission from the Lagoon nebula, M8.
White, G. J.; McCaughrean, M. J.; Tothill, N. F. H. +3 more
The discovery is reported of the second strongest source of mm and submm wavelength CO line emission, towards M8, the Lagoon Nebula in Sagittarius. The ~31Msun_ molecular core has dimensions ~0.2x0.3pc and is centred on the O7V star Herschel 36 (H36), near the Hourglass Nebula in the core of M8. Emission from the CO line wings extends t…
Trapped energetic ions in Jupiter's inner magnetosphere
Anglin, J. D.; Burrows, J. R.; Mu, J. L. +1 more
Ion measurements made with the high-flux telescope at ~1MeV/nucleon during the passage of the Ulysses spacecraft through Jupiter's inner magnetosphere are presented. Stable pancake-shaped pitch angle distributions were observed for protons inside ~17RJ. They are fitted by a time-independent model in which an assumed directional flux at …
An Unusual Brightening of the Eclipsing Binary Star AKO 9 in the Globular Cluster 47 Tucanae Observed with the Hubble Space Telescope
Minniti, Dante; Pryor, Carlton; Tinney, Christopher G. +3 more
Fifteen sequential images of the core of the globular cluster 47 Tucanae taken in ultraviolet light with the Hubble Space Telescope have revealed one star that increased in brightness by more than 2 mag in less than an hour. By the end of our observations, this star was the brightest object in the core of the cluster in our bandpass. Aurière et al…
The barium stars in the Hertzsprung-Russel diagram.
Bergeat, J.; Knapik, A.
We present absolute magnitudes for a sample of 52 barium stars observed by the HIPPARCOS satellite, and their location in the HR diagram. Our plot (Fig. 1) is restricted to stars with parallax accuracies better than 22%. The luminosity classes range from Ib supergiants down to V dwarfs on the main sequence, as expected from spectral classificaiton…
Three-Dimensional Orbits of Metal-poor Halo Stars and the Formation of the Galaxy
Yoshii, Yuzuru; Chiba, Masashi
We present the three-dimensional orbital motions of metal-poor stars in conjunction with their metal abundances, for the purpose of getting insight into the formation process of the Galaxy. Our sample stars, which include metal-deficient red giants and RR Lyrae variables observed by the HIPPARCOS satellite, are least affected by known systematics,…
Energetic and relativistic nuclei and electron experiment of the SOHO mission
Valtonen, E.; Peltonen, J.; Peltonen, P. +17 more
The design of the ERNE experiment of the ESA and NASA collaborative SOHO mission is described. ERNE will investigate the sun by measuring energetic particles. Starting from the design objectives, as determined by the scientific goals of the experiment, and from the adopted basic solutions, the design and structure of the instrument are presented i…
RY Persei: an Early-Type Interacting Close Binary
Olson, Edward C.; Plavec, Mirek J.
We have analyzed photometric and spectroscopic data for the totally-eclipsing binary RY Persei. It is a semidetached binary of the Algol type. However, both the gainer (B4: V) and the loser (F7: II-III) are significantly more massive (6.25 and 1.6 M_sun), hotter, and more luminous (Mbol about -3.3 and -0.2 mag, respectively) than a typi…
Using photochemistry to explain the formation and observation of C 2 in comets
Weaver, Harold A.; A'Hearn, Michael F.; Sorkhabi, Osman +4 more
Laboratory data taken from the laser-induced fluorescence (LIF) spectrum of C 2(X 1Σg+) radicals produced during the 193 nm laser photolysis of C 2H 2 has been used to explain the band profiles of the Hubble Space Telescope (HST) on nucleus spectra of the C 2 Mulliken sys…
High-Resolution Hubble Space Telescope Observations of Zn II and CR II Absorption toward the Magellanic Clouds
Roth, Katherine C.; Blades, J. Chris
We present high-resolution (3.5 km s-1) spectra of Zn II and Cr II absorption obtained with the Hubble Space Telescope toward four Magellanic Cloud stars. We have detected absorption from the full extent of the Milky Way disk + halo with an average depletion measure of [Cr/Zn] = -1.07 +/- 0.05. In addition, we identify absorption from t…
Models of optical/UV continuum in AGN: constraints from the NGC 5548 monitoring campaign
Czerny, B.; Loska, Z.
We analyse the data from the International Ultraviolet Explorer (IUE) observational campaign on the Seyfert galaxy NGC 5548 in the context of 10 phenomenological models. On the basis of the optical/UV data, as well as of constraints from the X-ray observations, we can favour one model of the nucleus: an accretion disc with an inner radius cut-off …