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Orbit Determination of Double-lined Spectroscopic Binaries by Fitting the Revised Hipparcos Intermediate Astrometric Data
Ren, Shulin; Fu, Yanning
Untill now, the Hipparcos intermediate astrometric data (HIAD) have contributed little to the full orbit determination of double-lined spectroscopic binaries (SB2s). This is because the photocenter of such a binary system is usually not far from the system mass center, and its orbital wobble is generally weak with respect to the accuracy of the HI…
Simultaneous X-ray and Ultraviolet Observations of the SW Sextantis Star DW Ursae Majoris
Dhillon, V. S.; Szkody, Paula; Hoard, D. W. +6 more
We present the first pointed X-ray observation of DW Ursae Majoris, a novalike cataclysmic variable (CV) and one of the archetype members of the SW Sextantis class, obtained with the XMM-Newton satellite. These data provide the first detailed look at an SW Sex star in the X-ray regime (with previous X-ray knowledge of the SW Sex stars limited prim…
Chandra Observation of Polaris: Census of Low-mass Companions
Evans, Nancy Remage; Schlegel, Eric; Karovska, Margarita +5 more
We have observed Cepheid Polaris (α UMi A: F7 Ib [Aa] + F6 V [Ab]) with Chandra ACIS-I for 10 ks. An X-ray source was found at the location of Polaris with log LX = 28.89 erg s-1 (0.3-8 keV) and kT = 0.6 keV. A spectrum this soft could come from either the supergiant or the dwarf, as shown by comparable coronal stars. Two res…
Observational Study of the Multistructured Planetary Nebula NGC 7354
Miranda, L. F.; Vázquez, R.; Olguín, L. +3 more
We present an observational study of the planetary nebula (PN) NGC 7354 consisting of narrowband Hα and [N II]λ6584 imaging as well as low- and high-dispersion long-slit spectroscopy, and VLA-D radio continuum. According to our imaging and spectroscopic data, NGC 7354 has four main structures: a quite round outer shell and an elliptical inner shel…
UCAC3 Proper Motion Survey. I. Discovery of New Proper Motion Stars in UCAC3 with 0farcs40 yr-1 > µ >= 0farcs18 yr-1 Between Declinations -90° and -47°
Henry, Todd J.; Finch, Charlie T.; Zacharias, Norbert
This paper presents 442 new proper motion stellar systems in the southern sky between declinations -90° and -47° with 0farcs40 yr-1 > µ >= 0farcs18 yr-1. These systems constitute a 25.3% increase in new systems for the same region of the sky covered by previous SuperCOSMOS RECONS (SCR) searches that used Schmidt p…
First Views of a Nearby LIRG: Star Formation and Molecular Gas in IRAS 04296+2923
Meier, David S.; Turner, Jean L.; Beck, Sara C. +3 more
We present a first look at the local luminous infrared galaxy (LIRG) IRAS 04296+2923. This barred spiral galaxy, overlooked because of its location behind the Taurus molecular cloud, is among the half dozen closest (D = 29 Mpc) LIRGs. More IR-luminous than either M82 or the Antennae, it may be the best local example of a nuclear starburst caused b…
UCAC3: Astrometric Reductions
Finch, Charlie T.; Zacharias, Norbert; Wycoff, Gary L.
Presented here are the details of the astrometric reductions from the x, y data to mean right ascension (R.A.), declination (decl.) coordinates of the third U.S. Naval Observatory CCD Astrograph Catalog (UCAC3). For these new reductions we used over 216,000 CCD exposures. The Two-Micron All-Sky Survey (2MASS) data are used extensively to probe for…
An Analytic Parameterization of Self-Gravity Wakes in Saturn's Rings, with Application to Occultations and Propellers
Porco, Carolyn C.; Hedman, Matthew M.; Burns, Joseph A. +4 more
We have developed a semianalytic method of parameterizing N-body simulations of self-gravity wakes in Saturn's rings, describing their photometric properties by means of only six numbers: three optical depths and three weighting factors. These numbers are obtained by fitting a sum of three Gaussians to the results of a density-estimation procedure…
The Multiple Pre-main-sequence System HBC 515 in L1622
Reipurth, Bo; Aspin, Colin; Herbig, George
The bright pre-main-sequence star HBC 515 (HD 288313) located in the L1622 cometary cloud in Orion has been studied extensively with optical/infrared imaging and ultraviolet/optical/infrared spectroscopy. The spectra indicate that HBC 515 is a weakline T Tauri star (TTS) of spectral type K2V. Adaptive optics imaging in the K band reveals that HBC …
WIYN Imaging of the Globular Cluster Systems of the Spiral Galaxies NGC 891 and NGC 4013
Rhode, Katherine L.; Young, Michael D.; Windschitl, Jessica L.
We present results from a WIYN 3.5 m telescope imaging study of the globular cluster (GC) systems of the edge-on spiral galaxies NGC 891 and NGC 4013. We used the 10' × 10' Minimosaic Imager to observe the galaxies in BVR filters to projected radii of ~20 kpc from the galaxy centers. We combined the WIYN data with archival and published data from …