Science Archives Publication System

Is it possible to observe the emission from the boundary layers of FU Ori stars?

Bibcode: 1997AstL...23..604E

Rossi, C.; Giovannelli, F.; Vittone, A. A. +3 more

Our estimates show that the optical depth of the stellar wind from the FU Ori stars FU Ori, V1057 Cyg, and Z CMa in the Balmer and Paschen contunua can be greater than unity. It is probably for this reason that no optical and ultraviolet emission is observed from the innermost and hottest regions of these objects the boundary layers of accretion d…

1997 • Astronomy Letters

IUE 1

Latitudinal and Radial Variation of >2 GeV Protons and Alpha Particles derived by Ulysses COSPIN/KET and Neutron Monitor Network Observations

Bibcode: 1997ICRC....2...85H

Heber, B.; Raviart, A.; Dröge, W. +6 more

1997 • International Cosmic Ray Conference

Ulysses 1

Investigation of the Guide Star Catalog

DOI: 10.1515/astro-1997-0234 Bibcode: 1997BaltA...6..313M

Smirnov, O. M.; Malkov, O. Y.

The Guide Star Catalog (GSC) was initially created at STScI to support the operational requirements of the Hubble Space Telescope (HST), specifically, to provide an all-sky set of reference coordinates for pointing and tracking. A new version of the catalog, GSC 1.1, includes bright stars from the HIPPARCOS INCA database. The GSC is widely used by…

1997 • Baltic Astronomy

Hipparcos 1

Diamagnetic effect of the ion pile-up region of comet halley

DOI: 10.1016/S0273-1177(97)00548-6 Bibcode: 1997AdSpR..20..283I

Neubauer, F. M.; Israelevich, P. L.; Ershkovich, A. I.

The ion pile-up region in the comet Halley ionosphere observed on the inbound leg of the Giotto trajectory is accompanied by a decrease of the magnetic field strength. This magnetic field dip is explained by means of a diamagnetic effect of the plasma density increase in the pile-up region. No similar magnetic effect of the enhanced plasma density…

1997 • Advances in Space Research

Giotto 1

Extreme ultraviolet observations of the solar corona: first results from the coronal diagnostic spectrometer on SOHO

DOI: 10.1016/S0273-1177(97)01059-4 Bibcode: 1997AdSpR..20.2239H

Mason, H. E.; Harrison, R. A.; Culhane, J. L. +9 more

We present first results from the Coronal Diagnostic Spectrometer (CDS) aboard the ESA/NASA Solar and Heliospheric Observatory (SOHO). CDS is a double spectrometer operating in the 151-785 A˚ range. This region of the solar spectrum is rich in emission lines from trace elements in the solar atmosphere, which can be used to derive diagnostic inform…

1997 • Advances in Space Research

SOHO 1

Intensity Gradients of Anomalous Cosmic Ray Oxygen Throughout the Heliosphere

Bibcode: 1997ICRC....2..257C

Klecker, B.; Mewaldt, R. A.; Cummings, A. C. +6 more

1997 • International Cosmic Ray Conference

Ulysses 1

Distinct Shock Acceleration Processes: ULYSSES Observations

Bibcode: 1997ICRC....1..385M

Trochoutsos, P. C.; Marhavilas, P.; Sarris, E. t. +1 more

1997 • International Cosmic Ray Conference

Ulysses 1

Radioactive isotopes in the cosmic rays

DOI: 10.1016/S0375-9474(97)00211-X Bibcode: 1997NuPhA.621...52D

Duvernois, M. A.

The primary (source) and secondary (spallogenic) galactic cosmic rays offer an opportunity to study recently synthesized nuclear material. The radioactive isotopes in both populations are of interest for understanding the cosmic ray source and propagation. This paper briefly reports on Ulysses High Energy Telescope (HET) observations of some cosmi…

1997 • Nuclear Physics A

Ulysses 0

The Chromospheric Activity on V711 Tau

Bibcode: 1997JASS...14...59K

Kang, Young-Woon

The relationship between Mg ¥± emission line and light variation of V711 Tau has been derived to investigate the chromospheric activity on V711 Tau. First, a shape of an optical light curve was compared with that of ultraviolet constructed from the IUE low resolution spectra. Second, the intensities of Mg ¥± k emission lines have been reduced from…

1997 • Journal of Astronomy and Space Sciences

IUE 0

Are Abell Clusters Correlated with Gamma-Ray Bursts?

Bibcode: 1997ICRC....3...53H

Cline, T.; Hurley, K.; Kouveliotou, C. +4 more

1997 • International Cosmic Ray Conference

Ulysses 0