Search Publications
Cosmic Origins Spectrograph Observations of the Chemical Composition of SNR LMC N132D
Shull, J. Michael; Danforth, Charles W.; France, Kevin +4 more
We present new far-ultraviolet (far-UV) spectra of an oxygen-rich knot in the Large Magellanic Cloud supernova remnant N132D, obtained with the Hubble Space Telescope (HST)-Cosmic Origins Spectrograph (COS). Moderate-resolution (Δv ≈ 200 km s-1) spectra in the HST far-UV bandpass (1150 Å lsim λ lsim 1750 Å) show emission from several io…
VIMS spectral mapping observations of Titan during the Cassini prime mission
Drossart, Pierre; Sotin, Christophe; Sicardy, Bruno +29 more
This is a data paper designed to facilitate the use of and comparisons to Cassini/visual and infrared mapping spectrometer (VIMS) spectral mapping data of Saturn's moon Titan. We present thumbnail orthographic projections of flyby mosaics from each Titan encounter during the Cassini prime mission, 2004 July 1 through 2008 June 30. For each flyby w…
Energy-Scale Calibration of the Suzaku X-Ray Imaging Spectrometer Using the Checker Flag Charge-Injection Technique in Orbit
Dotani, Tadayasu; Miller, Eric D.; Mori, Hideyuki +25 more
The X-ray Imaging Spectrometer (XIS) aboard the Suzaku satellite is an X-ray CCD camera system that has superior performance, such as a low background, high quantum efficiency, and good energy resolution in the 0.2--12keV band. Because of radiation damage in orbit, however, the charge-transfer inefficiency (CTI) has increased, and hence the energy…
CoRoT-2a Magnetic Activity: Hints for Possible Star–Planet Interaction
Pagano, Isabella; Lanza, Antonino F.; Baglin, Annie +3 more
CoRoT-2a is a young (≈0.5 Gyr) G7V star accompanied by a transiting hot-Jupiter, discovered by the CoRoT satellite (Alonso et al. Astron Astrophys 482:L21, 2008; Bouchy et al. Astron Astrophys 482:L25, 2008). An analysis of its photospheric activity, based on spot modelling techniques previously developed by our group for the analysis of the Sun a…
X-ray optical depth diagnostics of T Tauri accretion shocks
Peres, G.; Sciortino, S.; Drake, J. J. +4 more
Context: In classical T Tauri stars, X-rays are produced by two plasma components: a hot low-density plasma, with frequent flaring activity, and a high-density lower temperature plasma. The former is coronal plasma related to the stellar magnetic activity. The latter component, never observed in non-accreting stars, could be plasma heated by the s…
Massive Star Multiplicity: The Cepheid W Sgr
Evans, Nancy Remage; Massa, Derck; Proffitt, Charles
We have obtained spectra of the W Sgr system with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope (HST). The spectra resolve the system into a distant companion B which is the hottest star in the system and the spectroscopic binary (A = Aa + Ab). A and B are separated by 0farcs16. We have extracted the spectra of both of the…
The Nuclear Outflows and Feedback in the Seyfert 2 Galaxy Markarian 573
Shields, Joseph C.; Pogge, Richard W.; Martini, Paul +2 more
We present a study of outflow and feedback in the well known Seyfert 2 galaxy Markarian 573 using high-angular resolution long-slit spectrophotometry obtained with the Hubble Space Telescope Imaging Spectrograph (STIS). Through analysis of the kinematics and ionization state of a biconical outflow region emanating from the nucleus, we find that th…
Hemispheric variation of coronal mass ejections in cycle 23
Gao, Peng-Xin; Li, Ke-Jun; Shi, Xiang-Jun
In this paper, we analyse the behaviour of the activity of coronal mass ejection (CME) observed by the Large Angle and Spectrometric Coronagraph Experiment on board the Solar and Heliospheric Observatory (SOHO/LASCO) in cycle 23 from 1997 to 2007 separately for the Northern and Southern hemispheres. The results show the following. (1) At all and l…
Solar irradiance forecast and far-side imaging
Haberreiter, M.; Fontenla, J. M.; Lindsey, C. +2 more
This paper presents a new approach to forecasting short-term Lyα solar irradiance variations due to the presence and evolution of magnetically heated regions in the Sun's outer atmosphere. This scheme is based on images of the solar disk at key wavelengths, currently Ca II K filtergrams, maps of backscattered solar Lyα from the interplanetary medi…
Toward an experimentally determined Al26m(p,γ)Si27 reaction rate in ONe novae
Clark, J. A.; Parikh, A.; Deibel, C. M. +3 more
Strong evidence of the nucleosynthesis of Galactic Al26 has been found through measurements involving excesses in Mg26 from the decay of Al26 in meteoritic inclusions and the 1.809-MeV γ-ray line detected by satellites such as CGRO and INTEGRAL. Several sites for the production of Al26 have been suggested, including ONe novae. Destruction of Al26 …