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IUE Spectra and Emission-Line Fluxes for Eight Planetary Nebulae

Feibelman, Walter A.

We present IUE spectra and observed emission-line fluxes for the planetary nebulae NGC 2438, NGC 2610, NGC 5307, NGC 6620, NGC 7354, K3-27, PB 8, and He 2-182. All data have been processed by the final archive NEWSIPS routines. PB 8 and He 2-182 display strong C IV λ1549 P Cygni profiles from which terminal wind velocities of -2835+/-500 km s^…

The δ Scuti Star DK Virginis (HR 5005) Revisited

Pamyatnykh, A. A.; Jerzykiewicz, Mikołaj

An analysis of Hp photometry of DK Virginis is carried out. The analysis reveals two frequencies, f₁=9.2095 and f₂=7.5764 cycles day^-1. These values turn out to be good enough to bridge the gap between the two available series of ground-based data, obtained in 1973 and 1980, so that the frequencies can be refined. …

Astrophysics in 1999

Aschwanden, Markus J.; Trimble, Virginia

The year 1999 saw the arrival of a star with three planets, a universe with three parameters, and a solar corona that could be heated at least three ways. In addition, there were at least three papers on every question that has ever been asked in astrophysics, from ``Will the Universe expand forever?'' to ``Does mantle convection occur in one or t…

V1073 Cygni: A New Light Curve and Analysis

Morris, Steven L.; Naftilan, Stephen A.

A new CCD light curve of the A-type W UMa star V1073 Cygni has been obtained, and the differential-corrections method of Wilson and Devinney was used to compute a new set of system parameters. The same analysis has been applied to the other photometric light curves in the literature, including the Hipparcos light curve. A new ephemeris is determin…

Periodicities in the Ultraviolet Flux of α Orionis

Houck, J. R.; Hajian, Arsen R.; Terzian, Yervant +1 more

We have used low-resolution spectra from the International Ultraviolet Explorer (IUE) to look for periodicities in the ultraviolet flux from α Orionis. The total continuum flux for each observation was integrated, producing longwave (1900-3200 Å) and shortwave (1250-1750 Å) light curves. The periodograms resulting from the shortwave data are noise…

Close Approaches of Stars to the Solar System Based on Hipparcos Data

García-Sánchez, Joan

Astrometry of the ω Centauri Hubble Space Telescope Calibration Field

Mighell, Kenneth J.

Astrometry, on the International Celestial Reference Frame (epoch J2000.0), is presented for the Walker (1994, PASP, 106, 824) stars in the ω Centauri (=NGC 5139=C1323-1472) Hubble Space Telescope (HST) Wide Field/Planetary Camera (WF/PC) calibration field of Harris et al. (1993, AJ, 105, 1196). Harris et al. stars were first identified on a WFPC2…