Science Archives Publication System

Evolution of SN 1987A in the ultraviolet.

Bibcode: 1993A&A...276..103S

Sanz Fernandez de Cordoba, L.

Two observational aspects of the evolution of SN 1987A in the UV are presented, based on IUE data. First, the spectral evolution of the NV, NIV], HeII, OIII], NIII] and CIII] emission lines in the period from March 13, 1987 to March 12, 1990. And secondly, the evolution of the SN 1987A continuum fluxes in various UV bands using SWP and LWP spectra…

1993 • Astronomy and Astrophysics

IUE 2

An Evidence for Gaseous Envelope Surrounding the RS CVn System lambda And

Bibcode: 1993AcA....43..139G

Glebocki, R.; Sikorski, J.

MgII h and k profiles are analyzed in 62 high dispersion IUE spectra of a long-period RS CVn binary lambda And. We find strong evidence of the presence of circumstellar matter surrounding the binary system. Estimated lower mass limit of the envelope is 6.6 times 10^{-14} M_odot. We present evidence for the changes with time of the perias…

1993 • Acta Astronomica

IUE 2

COMPTEL Observation of GRB 930131

Bibcode: 1993ICRC....1...85K

Greiner, J.; Hanlon, L.; Schönfelder, V. +11 more

1993 • 23rd International Cosmic Ray Conference (ICRC23), Volume 1

Ulysses 2

Ephemerides of the 48 HIPPARCOS minor planets for the year 1993

Bibcode: 1993A&AS...98...77B

Bec-Borsenberger, A.

To be observed by Hipparcos, the position of each object has to be known with an accuracy of 1 arcsecond and its magnitude with an accuracy of 0.5 mag. Therefore, the orbital elements of the 48 selected minor planets of the Hipparcos mission, have been improved in order to extrapolate their ephemerides with the accuracy required. Updated ephemerid…

1993 • Astronomy and Astrophysics Supplement Series

Hipparcos 2

Silicon Abundances in Population I Giants

DOI: 10.1086/116819 Bibcode: 1993AJ....106.2510B

Bohm-Vitense, Erika

Silion to carbon abundance ratios for Population I giants were determined from emission lines originating in the transition layers between stellar chromospheres and coronae. For effective temperatures larger than 6200 K we find a group of stars for which the silicon to carbon abundance ratio appears to be increased. These stars are presumably desc…

1993 • The Astronomical Journal

IUE 2

Low Energy Ion and Electron Events at Ulysses Beyond 5 AU and at IMP8 near Earth

Bibcode: 1993ICRC....3..338R

Simnett, G. M.; Lanzerotti, L. J.; Roelof, E. C. +1 more

1993 • 23rd International Cosmic Ray Conference (ICRC23), Volume 3

Ulysses 2

The '10-hour' Modulation of the Jovian Electron Spectrum in Interplanetary Space-Ulysses Observations

Bibcode: 1993ICRC....3..346R

Ferrando, P.; Raviart, A.; Ducros, R. +1 more

1993 • 23rd International Cosmic Ray Conference (ICRC23), Volume 3

Ulysses 2

A global analysis method for astrolabe observations

Bibcode: 1993A&A...280..675C

Chollet, F.

In a previous paper (Chollet & Najid 1992), we gave the general principles of a new global method to analyze the astrolabe observations. The fundamental equation was obtained from the classical one in which the corrections to the star positions at the observational epoch are replaced by developments that contain the corrections to the star pos…

1993 • Astronomy and Astrophysics

Hipparcos 2

Observations of 0.3 to 2.0 MeV Protons in the 1 to 5 AU Region with Voyager 1 and Ulysses Compared to IMP 8

Bibcode: 1993ICRC....3..334B

Armstrong, T.; Boufaida, M.

1993 • 23rd International Cosmic Ray Conference (ICRC23), Volume 3

Ulysses 2

Calibration of Hipparcos Long Period Variable Start Fields Using Multi-Color CCD Observations

Bibcode: 1993JAVSO..22....2H

Howell, Steve B.; Mattei, Janet; Benson, Priscilla J. +1 more

The first set of 4-color AAVSO CCD finder charts has been prepared using the 0.9-m telescope at Kitt peak national Observatory in Arizona. The stars selected were northern long period variable stars observed with the Hipparcos astrometric satellite, since multicolor photometry was needed on these stars to calibrate and reduce the photometric and a…

1993 • Journal of the American Association of Variable Star Observers (JAAVSO)

Hipparcos 2