Results 11 to 20 of about 66,780 (247)

Is Life an Unavoidable Consequence of the Formation of the Universe? Investigating the Formation of Bio-Precursors and the Signature of Earth-Like Living Forms

Frontiers in Astronomy and Space Sciences, 2018
This contribution to the Research Topic “Imagining the Future of Astronomy and Space Sciences” focuses on astrobiology and exoplanetary research. Understanding the origin of life is the main scientific challenge to this century and an interdisciplinary ...
Ana I. Gomez de Castro
doaj   +1 more source

The Colorado Ultraviolet Transit Experiment Mission Overview

The Astronomical Journal, 2023
Atmospheric escape is a fundamental process that affects the structure, composition, and evolution of many planets. The signatures of escape are detectable on close-in, gaseous exoplanets orbiting bright stars, owing to the high levels of extreme ...
Kevin France, Brian Fleming, Arika Egan, Jean-Michel Desert, Luca Fossati, Tommi T. Koskinen, Nicholas Nell, Pascal Petit, Aline A. Vidotto, Matthew Beasley, Nicholas DeCicco, Aickara Gopinathan Sreejith, Ambily Suresh, Jared Baumert, P. Wilson Cauley, Carolina Villarreal D’Angelo, Keri Hoadley, Robert Kane, Richard Kohnert, Julian Lambert, Stefan Ulrich   +20 more
doaj   +1 more source

The radial velocity curve of HD153919 (4U1700-37) revisited [PDF]

, 2003
We have re-analysed all available high-resolution ultraviolet IUE spectra of the high-mass X-ray binary HD153919/4U1700-37. The radial velocity semi-amplitude of 20.6 +/- 1.0 km/s and orbital eccentricity of 0.22 +/- 0.04 agree very well with the values ...
Ankay, Barziv, Clark, Conti, Evans, G. Hammerschlag-Hensberge, Gies, Haberl, Hammerschlag-Hensberge, Hammerschlag-Hensberge, Heap, Humphreys, Jones, Kaper, Kaper, Kaper, L. Kaper, M. H. van Kerkwijk, Quaintrell, Rubin, Stickland, Stickland, Van Kerkwijk, Van Kerkwijk, Van Paradijs, Zuiderwijk   +25 more
core   +4 more sources

A Giant Planet Undergoing Extreme-Ultraviolet Irradiation By Its Hot Massive-Star Host [PDF]

, 2017
The amount of ultraviolet irradiation and ablation experienced by a planet depends strongly on the temperature of its host star. Of the thousands of extrasolar planets now known, only six have been found that transit hot, A-type stars (with temperatures ...
Bayliss, D., Beatty, T. G., Bieryla, A., Bozza, V., Buchhave, L. A., Collins, K. A., Colón, K. D., Crepp, J. R., Curtis, I. A., DePoy, D. L., Dumont, M. T., D’Ago, G., Eastman, J. D., Ellis, T., Esquerdo, G. A., Fukui, A., Fulton, B. J., Gaillard, C., Gaudi, B. S., Gonzales, E. J., Gould, A., Gregorio, J., Howard, A. W., Ito, A., James, D. J., Jang-Condell, H., Jensen, Eric L.N., Johnson, M. C., Joner, M. D., Kasper, D. H., Kielkopf, J. F., Kuhn, R. B., Labadie-Bartz, J., Latham, D. W., Lund, M. B., Manner, M., Marshall, J. L., Matt, K., McLeod, K. K., Narita, N., Novati, S. C., Oberst, T. E., Penny, M., Pepper, J., Pogge, R. W., Reed, P. A., Relles, H., Rodriguez, J. E., Scarpetta, G., Siverd, R. J., Stassun, K. G., Stephens, D. C., Stevens, D. J., Stockdale, C., Tan, T. G., Trueblood, M., Trueblood, P., Yeigh, R. R., Zambelli, R., Zhou, G.   +59 more
core   +3 more sources

Nonequilibrium Ionization Modeling of Petschek-type Shocks in Reconnecting Current Sheets in Solar Eruptions

The Astrophysical Journal, 2023
Nonequilibrium ionization (NEI) is essentially required for astrophysical plasma diagnostics once the plasma status departs from the assumption of ionization equilibrium.
Chengcai Shen, John C. Raymond, Nicholas A. Murphy   +2 more
doaj   +1 more source

Interpreting the Si ii and C ii Line Spectra from the COS Legacy Archive Spectroscopic SurveY Using a Virtual Galaxy from a High-resolution Radiation-hydrodynamic Simulation

The Astrophysical Journal, 2023
Observations of low-ionization state metal lines provide crucial insights into the interstellar medium (ISM) of galaxies, yet, disentangling the physical processes responsible for the emerging line profiles is difficult.
Simon Gazagnes, Valentin Mauerhofer, Danielle A. Berg, Jeremy Blaizot, Anne Verhamme, Thibault Garel, Dawn K. Erb, Karla Z. Arellano-Córdova, Jarle Brinchmann, John Chisholm, Matthew Hayes, Alaina Henry, Bethan L. James, Anne Jaskot, Nika Jurlin, Crystal L. Martin, Michael Maseda, Claudia Scarlata, Evan D. Skillman, Stephen M. Wilkins, Aida Wofford, Xinfeng Xu   +21 more
doaj   +1 more source

The Challenge to Large Optical Telescopes from X-ray Astronomy [PDF]

, 2002
In the ROSAT era of the mid-1990's, the problems facing deep X-ray surveys could be largely solved with 10 m class telescopes. In the first decade of this new millennium, with X-ray telescopes such as the Chandra X-ray Observatory and XMM-Newton in ...
Hornschemeier, Ann E.
core   +3 more sources

Discovery of 20 UV-emitting SNRs in M31 with UVIT

The Astronomical Journal, 2023
We present the first catalog of supernova remnants (SNRs) in M31 that exhibit diffuse ultraviolet (UV) emission. UV images of M31 were obtained by the Ultraviolet Imaging Telescope (UVIT) on the AstroSat satellite, and the list of SNRs was obtained from ...
Denis Leahy, Christopher Monaghan, Sujith Ranasinghe   +2 more
doaj   +1 more source

Simultaneous Estimates of Star-cluster Age, Metallicity, Mass, and Extinction (SESAMME). I. Presenting an MCMC Approach to Spectral Stellar Population Fitting

The Astrophysical Journal, 2023
We present the first version release of SESAMME, a public, Python-based full spectrum fitting tool for Simultaneous Estimates of Star-cluster Age, Metallicity, Mass, and Extinction.
Logan H. Jones, Svea Hernandez, Linda J. Smith, Bethan L. James, Alessandra Aloisi, Søren Larsen   +5 more
doaj   +1 more source

UV and EUV Instruments

, 2010
We describe telescopes and instruments that were developed and used for astronomical research in the ultraviolet (UV) and extreme ultraviolet (EUV) regions of the electromagnetic spectrum.
A. Boggess, A. Boksenberg, A. Gregorio, A. Vuillemin, A.A. Boyarchuk, A.A. Boyarchuk, A.F. Davidsen, A.L. Broadfoot, A.M. Smith, A.M. Zvereva, B. Valcu, B.G. Taylor, C. de Jager, C. Morales, C.B. Opal, C.S. Weller, D.C. Martin, D.J. Sahnow, E. Pfeffermann, E.B. Jenkins, E.G. Schmidt, E.J. Korpela, F. Paresce, F.G. Ocallaghan, G.A. Gurzadyan, G.A. Gurzadyan, G.G. Spear, G.M. Tovmasyan, G.R. Carruthers, G.R. Carruthers, G.R. Carruthers, G.R. Carruthers, G.R. Carruthers, H.W. Moos, H.W. Moos, J. Barnstedt, J. Edelstein, J. Murthy, J. Murthy, J.B. Pearce, J.B. Rogerson, J.D. Fix, J.J. Bloch, J.W. Kruk, K.G. Henize, K.H. Nordsieck, K.O. Mason, L. Strüder, L.H. Aller, M. Hurwitz, M. Hurwitz, M. Hurwitz, M. Hurwitz, M. Laget, M. Maucherat-Joubert, M.A. Barstow, M.C. Weisskopf, M.R. Molnar, N. Gehrels, N.A. Dimov, N.A. Dimov, N.A. Dimov, N.A. Dimov, N.E. White, P. Morissey, P.R. Wesselius, R. Giacconi, R. Stalio, R. Wilson, R.C. Bless, R.C. Henry, R.J. van Duinen, S. Bowyer, S. Bowyer, S. Bowyer, S. Bowyer, S. Bowyer, S. Bowyer, T.P. Stecher, V.G. Kurt, V.G. Kurt, W. Tobin, W.G. Fastie, Y. Kondo   +83 more
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