Search Publications
Understanding structure in line-driven stellar winds using ultraviolet spectropolarimetry in the time domain
Nazé, Yaël; Ignace, Richard; Scowen, Paul A. +13 more
The most massive stars are thought to lose a significant fraction of their mass in a steady wind during the main-sequence and blue supergiant phases. This in turn sets the stage for their further evolution and eventual supernova, and preconditions the surrounding medium for all following events, with consequences for ISM energization, chemical enr…
Ultraviolet spectropolarimetry with Polstar: using Polstar to test magnetospheric mass-loss quenching
Cheung, M. C. M.; Wade, G. A.; Nazé, Y. +17 more
Polstar is a proposed NASA MIDEX space telescope that will provide high-resolution, simultaneous full-Stokes spectropolarimetry in the far ultraviolet, together with low-resolution linear polarimetry in the near ultraviolet. This observatory offers unprecedented capabilities to obtain unique information on the magnetic and plasma properties of the…
Prospect for UV observations from the Moon. III. Assembly and ground calibration of Lunar Ultraviolet Cosmic Imager (LUCI)
Brosch, Noah; Mathew, Joice; Sreejith, A. G. +14 more
The Lunar Ultraviolet Cosmic Imager (LUCI) is a near-ultraviolet (NUV) telescope with all-spherical mirrors, designed and built to fly as a scientific payload on a lunar mission with Team Indus—the original Indian entry to the Google Lunar X-Prize. Observations from the Moon provide a unique opportunity of a stable platform with an unobstructed vi…
A catalogue of 108 extended planetary nebulae observed by GALEX
Pradhan, Ananta C.; Panda, Swayamtrupta; Ojha, Devendra K. +2 more
We present the ultraviolet (UV) imaging observation of planetary nebulae (PNe) using archival data of Galaxy Evolution Explorer (GALEX). We found 358 PNe detected by GALEX in near-UV (NUV). We have compiled a catalogue of 108 extended PNe with sizes greater than
UV astronomy throughout the ages: a historical perspective
Linsky, Jeffrey L.
Astronomers have long recognized the critical need for ultraviolet imaging, photometry and spectroscopy of stars, planets, and galaxies, but this need could not be satisfied without access to space and the development of efficient instrumentation. When UV measurements became feasible, first with rockets and then with satellites, major discoveries …
Spectral behavior of Nova GQ Mus in the ultraviolet
Sanad, M. R.; Abdel-Sabour, M. A.
We present ultraviolet spectroscopic study of nova GQ Mus observed with the International Ultraviolet Explorer (IUE) during the period 1983–1985. Different spectra showing the changes in line fluxes at different times are presented. The outflow velocity of the ionized ejecta was calculated to be 1010–2900
Ultraviolet spectral variations of symbiotic nova PU Vul during and after second eclipse
Sanad, M. R.
I have analyzed spectral data of the symbiotic nova PU Vul observed with the International Ultraviolet Explorer (IUE) during the period 1993–1996. The study concentrated on the two sources of nebular emitting regions, the first is a nebula around the white dwarf partially eclipsed by a cool giant star and the second is a very extended nebular regi…
Ultraviolet spectral behavior of AO Psc and V1223 Sgr from the HST and IUE satellites
Sanad, M. R.
We present a spectroscopic study of two intermediate polar systems, AO Psc and V1223 Sgr observed with the Hubble Space Telescope Space Telescope Imaging Spectrograph (HST STIS) and International Ultraviolet Explorer (IUE) during the period 1980–2000. The reddening of two systems is determined from the 2200 Å feature. The ultraviolet emission line…
Ultraviolet spectroscopy of V Sagittae in high, intermediate and low states from HST and IUE satellites
Sanad, M. R.
We present the first phase resolved ultraviolet spectroscopic study of V Sge in high, intermediate and low states observed with the Hubble Space Telescope High Resolution Spectrograph (HST HRS) and International Ultraviolet Explorer (IUE) during the period 1978–1996 to diagnose the ultraviolet fluxes of C IV 1550 Å and He II 1640 Å emission lines …
Similarities and differences in the spectral behavior of W Ser and UX Mon in the ultraviolet
Sanad, M. R.; Bobrowsky, M.
We present ultraviolet spectra of two eclipsing interacting binary systems, W Ser and UX Mon, with good coverage over the 14.16-day and 5.9-day orbital periods, respectively, using observations taken by the International Ultraviolet Explorer (IUE) during the period between 1978–1993 and 1981–1991. Two profiles of W Ser and UX Mon showing variation…