Search Publications
Multiple Populations in NGC 1851: Abundance Variations and UV Photometric Synthesis in the Washington and HST/WFC3 Systems
Cummings, Jeffrey D.; Geisler, D.; Villanova, S.
The analysis of multiple populations (MPs) in globular clusters (GCs), both spectroscopically and photometrically, is key in understanding their formation and evolution. The relatively narrow Johnson U, F336W, and Stromgren and Sloan u filters have been crucial in exhibiting these MPs photometrically, but in Paper I we showed that the broader Wash…
Far Ultraviolet Spectroscopy of Old Novae. II. RR Pic, V533 Her, and DI Lac
Sion, Edward M.; Godon, Patrick; Jones, Liam
The old novae V533 Her (Nova Her 1963), DI Lac (Nova Lac 1910), and RR Pic (Nova Pic 1891) are in (or near) their quiescent stage, following their nova explosions, and continue to accrete at a high rate in the aftermath of their explosions. They exhibit continua that are steeply rising into the FUV, as well as absorption lines and emission lines o…
On the Relation of Silicates and SiO Maser in Evolved Stars
Jiang, Biwei; Liu, Jiaming
The SiO molecule is one of the candidates for the seed of silicate dust in the circumstellar envelope of evolved stars, but this opinion is challenged. In this work we investigate the relation of the SiO maser emission power and the silicate dust emission power. With both our own observation by using the PMO/Delingha 13.7 m telescope and archive d…
New Orbits for 18 Binaries
Cvetković, Z.; Pavlović, R.
Orbital elements of 18 visual binaries are computed using the measurements collected in the Fourth Catalog of Interferometric Measurements of Binary Stars; 15 orbits are determined for the first time and three orbits are revised. Eleven of the binaries, denoted as HDS, were discovered during the Hipparcos mission. The remaining binaries were disco…
Disrupted Asteroid P/2016 G1. II. Follow-up Observations from the Hubble Space Telescope
Moreno, F.; Pinilla-Alonso, N.; Licandro, J. +3 more
After the early observations of the disrupted asteroid P/2016 G1 with the 10.4 m Gran Telescopio Canarias (GTC) and modeling of the dust ejecta, we have performed a follow-up observational campaign of this object using the Hubble Space Telescope (HST) during two epochs (2016 June 28 and July 11). The analysis of these HST images with the same mode…
A New Look at the Integrated Radio/Microwave Continuum Spectrum of Galactic Supernova Remnant IC 443
Onić, D.; Leahy, D.; Urošević, D.
Recent observations of the microwave sky, by space telescopes such as the Wilkinson Microwave Anisotropy Probe and Planck, have opened a new window into the analysis of continuum emission from supernova remnants (SNRs). In this paper, different emission models that can explain the characteristic shape of currently known integrated radio/microwave …
Point and Compact Hα Sources in the Interior of M33
Joner, Michael D.; Roming, Peter W. A.; Hintz, Eric G. +2 more
A variety of interesting objects such as Wolf-Rayet stars, tight OB associations, planetary nebulae, X-ray binaries, etc., can be discovered as point or compact sources in Hα surveys. How these objects distribute through a galaxy sheds light on the galaxy star formation rate and history, mass distribution, and dynamics. The nearby galaxy M33 is an…
A New Orbit for the Eclipsing Binary V577 Oph
Jeffery, Elizabeth J.; Barnes, Thomas G., III; Skillen, Ian +1 more
Pulsating stars in eclipsing binary systems are unique objects for providing constraints on stellar models. To fully leverage the information available from the binary system, full orbital radial velocity curves must be obtained. We report 23 radial velocities for components of the eclipsing binary V577 Oph, whose primary star is a δ Sct variable.…
Hubble COS Spectroscopy of the Dwarf Nova CW Mon: The White Dwarf in Quiescence?
Szkody, Paula; Sion, Edward M.; Godon, Patrick +4 more
We present a synthetic spectral analysis of the HST COS spectrum of the U Geminorum-type dwarf nova CW Mon, taken during quiescence as part of our COS survey of accreting white dwarfs (WDs) in Cataclysmic Variables. We use a synthetic photosphere and optically thick accretion disk spectra to model the COS spectrum as well as archival IUE spectra o…
Near-infrared Polarimetric Study of the N159/N160 Star-forming Complex in the Large Magellanic Cloud
Kwon, Jungmi; Tamura, Motohide; Jeong, Woong-Seob +4 more
We present near-infrared polarimetric results for the N159/N160 star-forming complex in the Large Magellanic Cloud with SIRPOL, the polarimeter of the Infrared Survey Facility. We separated foreground sources using their visual extinction derived from near-infrared photometric data. The 45 young stellar candidates and 2 high-excitation blobs were …