Search Publications
The Recent Star Formation History of NGC 5102
Freeman, Kenneth C.; Norman, Colin A.; Hidalgo, Sebastian L. +2 more
We present Hubble Space Telescope photometry of young stars in NGC 5102, a nearby gas-rich post-starburst S0 galaxy with a bright young stellar nucleus. We use the IAC-pop/MinnIAC algorithm to derive the recent star formation history in three fields in the bulge and disk of NGC 5102. In the disk fields, the recent star formation rate has declined …
Massive Star Formation in NGC 2074
Chu, You-Hua; Gruendl, Robert A.; Chen, C. -H. Rosie +2 more
Spitzer observations of the Large Magellanic Cloud (LMC) have revealed a large population of young stellar objects (YSOs), but complementary high-resolution images in the optical or near-IR wavelengths are still needed to resolve the multiplicity and immediate environments of the YSOs. The Hubble Space Telescope imaged the star-forming region NGC …
Observations and Analyses of the Eccentric Orbit Eclipsing Binary HP Draconis
Oblak, E.; Milone, E. F.; Kurpińska-Winiarska, M.
We present results of an analysis of all available data of the double-lined spectroscopic and eclipsing binary HP Draconis. The analyses make use of unpublished radial velocity (RV) and extensive photoelectric photometry data as well as published Hipparcos photometric observations and RV data from Asiago Observatory. The system is eccentric and th…
Variable O VI and N V Emission from the X-ray Binary LMC X-3: Heating of the Black Hole Companion
Tripp, Todd M.; Steiner, James F.; McClintock, Jeffrey E. +8 more
Based on high-resolution ultraviolet spectroscopy obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) and the Cosmic Origins Spectrograph, we present new detections of O VI and N V emission from the black hole X-ray binary (XRB) system LMC X-3. We also update the ephemeris of the XRB using recent radial velocity measurements obtained w…
Orbital Solutions and Absolute Elements of the Eclipsing Binary EE Aquarii
Sowell, James R.; Wronka, Marissa Diehl; Gold, Caitlin +1 more
EE Aqr is a 7.9 mag Algol variable with a 12 hr orbital period. The Wilson-Devinney program is used to simultaneously solve 11 previously published light curves together with two existing radial velocity curves. The resulting masses are M 1 = 2.24 ± 0.13 M sun and M 2 = 0.72 ± 0.04 M sun, and the radii a…
A Search for RR Lyrae Variables in the Central Region of M54
Mighell, Kenneth J.; Montiel, Edward J.
We have analyzed archival Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2) observations of the central region of the globular cluster M54. The 12 irregularly timed observations (6 F555W, 6 F814W) were reduced using the HSTphot stellar photometry package. Our statistical analysis of the HSTphot photometry yielded 50 variable stars…
XMM-Newton Observations of the Radio-Loud Broad Absorption Line Quasar FBQS J131213.5+231958
Mathur, Smita; Dai, Xinyu
We present XMM-Newton observations of the broad absorption line (BAL) quasar FBQS J131213.5+231958. The X-ray spectrum of the source can be well described by an absorbed power-law model in which the absorber is either ionized or only partially covers the continuum source. This can explain the apparent lack of absorption observed in the Chandra spe…
The Young Stellar Population of the Nearby Late-type Galaxy NGC 1311
Windhorst, Rogier A.; Eskridge, Paul B.; Jansen, Rolf A. +1 more
We have extracted point-spread-function-fitted stellar photometry from near-ultraviolet, optical, and near-infrared images, obtained with the Hubble Space Telescope, of the nearby (D ≈ 5.5 Mpc) SBm galaxy NGC 1311. The ultraviolet and optical data reveal a population of hot main-sequence (MS) stars with ages of 2-10 Myr. We also find populations o…
Brorfelde Schmidt CCD Catalog
Zacharias, N.; Wycoff, G. L.; Clausen, J. V. +4 more
The Brorfelde Schmidt CCD Catalog (BSCC) contains about 13.7 million stars, north of +49° decl. with precise positions and V, R photometry. The catalog has been constructed from the reductions of 18,667 CCD frames observed with the Brorfelde Schmidt Telescope between 2000 and 2007. The Tycho-2 catalog was used for astrometric and photometric refer…