Search Publications
Absolute Magnitude Calibration for the W UMa-Type Systems Based on HIPPARCOS Data
Rucinski, S. M.; Duerbeck, H. W.
Hipparcos parallax data for 40 contact binary stars of the W UMa-type (with epsilon M_V < 0.5) are used to derive a new, (B-V)-based absolute-magnitude calibration of the form M_V = M_V(log P,B-V). The calibration covers the ranges 0.26 < (B-V)_0 < 1.14, 0.24 < P < 1.15 day, and 1.4 < M_V < 6.1; it is based on a solution weigh…
A Catalog and Atlas of Cataclysmic Variables-Second Edition
Shara, Michael M.; Downes, Ronald; Webbink, Ronald F.
We present a catalog of all 1020 known cataclysmic variables (CVs). This paper is a major update of the first edition of the catalog (Downes and Shara 1993, PASP, 105, 127), which contained coordinates (measured in the reference frame of the Hubble Space Telescope Guide Star Survey for the non-novae, and obtained from the literature for the novae)…
Luminosities of SX Phoenicis, Large-Amplitude Delta Scuti, and RR Lyrae Stars
McNamara, D.
Strömgren _uvbyβ photometry of SX Phoenicis and large-amplitude δ Scuti variables is analyzed to determine the mean temperatures, metal abundances, and surface gravities of the stars. The mean temperatures and fundamental periods are used in conjunction with the pulsation equation and stellar models to derive masses, radii, surface gravities, and …
The Ultraviolet Imaging Telescope: Instrument and Data Characteristics
O'Connell, R. W.; Bohlin, R. C.; Stecher, T. P. +16 more
The Ultraviolet Imaging Telescope (\UIT) was flown as part of the \AstroMiss\ observatory on the Space Shuttle Columbia in December 1990 and again on the Space Shuttle Endeavor in March 1995. Ultraviolet (1200-3300\AA) images of a variety of astronomical objects, with a 40\arcmin\ field of view and a resolution of about 3\arcsec, were recorded on …
The Star-Formation History in the Vicinity of NGC 1866 in the Large Magellanic Cloud
Watson, A. M.; Holtzman, J. A.; Stapelfeldt, K. R. +15 more
To expand on the recent single WFPC2 field obtained in the vicinity of this cluster, we have measured the luminosity function in a one-third by one-half degree field in the LMC with the 40 inch telescope at Siding Spring Observator. Combining our results with recent 4-meter and WFPC2 observations, we examine the constraints on the star formation h…
High S/N Echelle Spectroscopy in Young Stellar Groups. I. Observations and Data Reduction
Brown, A. G. A.; Le Poole, R. S.; David, M. +4 more
This is the first paper in a series in which we study the kinematical structure and dynamical evolution of OB associations and young stellar clusters. By means of high-resolution high-S/N spectroscopic observations, we aim at obtaining accurate stellar radial and rotational velocities and information on binarity in a selected number of such system…
The Mass of the Classical Cepheid V350 SGR
Bohm-Vitense, E.; Evans, N. R.; Carpenter, K. +2 more
Two medium resolution spectra of the hot companion of the Cepheid V350 Sgr have been obtained with the Goddard High Resolution Spectrograph aboard the Hubble Space Telescope. Comparison of these spectra (in the wavelength range 1840 to 1880 \AA) with the spectrum of $\alpha$ Lyr shows that V350 Sgr B has a projected rotation velocity which may be …
The Mount Wilson Halo Mapping Project 1975-1985 I: The UBV(RI)_M_W Photometric System Compared with Other Standard Systems: The Adopted Trigonometric HR Diagram in (R-I)_M_W and (V-I)_M_W
Sandage, A.
Photometry of stars is described that defines a UBV(RI)_M_W photometric system, established between 1975 and 1980 using the Mount Wilson 60-inch and 100-inch reflectors. The MW natural system has been reduced to the UBV(RI)_C Cape-Cousins system by linear equations for stars hotter than M0. Strong non-linear color and magnitude equations exit in R…
The IUE Spectrum of the Binary Nucleus of the Planetary Nebula NGC 1514
Feibelman, W. A.
Archival IUE low-dispersion spectra and the first ultraviolet high-dispersion spectrum of the binary nucleus of NGC 1514 have been analyzed. Both SWP and LWR low-dispersion spectra show variability by as much as a factor of two in the continuum level between the years 1978 and 1989. Weak P Cygni features for OV lambda 1371 and C IV lambda 1549 yie…
The Supergiant Binary BM CAS
Evans, N. R.; Fernie, J. D.
Attracted by an earlier claim (Thiessen 1956) that BM Cas is an eclipsing binary with one component a classical Cepheid, we have obtained new photometry and IUE ultraviolet spectra of the system. While we verify that there is variability in addition to the eclipses, we conclude that there is no classical Cepheid present. The variability is irregul…