Results 141 to 150 of about 476,629 (275)

Optical Photometry of the GRB 010222 Afterglow

, 2001
The optical afterglow of GRB 010222 was observed using the recently installed 2-m telescope at the Indian Astronomical Observatory, Hanle, and the telescopes at the Vainu Bappu Observatory, Kavalur, beginning ~ 0.6 day after the detection of the event.
Cowsik, R., Prabhu, T. P., Anupama, G. C., Bhatt, B. C., Sahu, D. K., Ambika, S., Padmakar, Bhargavi, S. G.   +7 more
openaire   +2 more sources

Astrometry and Photometry with Coronagraphs

, 2006
We propose a solution to the problem of astrometric and photometric calibration of coronagraphic images with a simple optical device which, in theory, is easy to use. Our design uses the Fraunhofer approximation of Fourier optics. Placing a periodic grid
Anand Sivaramakrishnan, Ben R. Oppenheimer, Chanan G., Lyot B., Yaitskova N., Yaitskova N.   +5 more
core   +1 more source

A novel image reconstruction method applied to deep Hubble Space Telescope Images [PDF]

, 1997
We have developed a method for the linear reconstruction of an image from undersampled, dithered data, which has been used to create the distributed, combined Hubble Deep Field images -- the deepest optical images yet taken of the universe. The algorithm,
Fruchter, Andrew, Hook, Richard
core   +3 more sources

New Extinction and Mass Estimates from Optical Photometry of the Very Low Mass Brown Dwarf Companion CT Chamaeleontis B with the Magellan AO System [PDF]

, 2015
We used the Magellan adaptive optics (MagAO) system and its VisAO CCD camera to image the young low mass brown dwarf companion CT Chamaeleontis B for the first time at visible wavelengths. We detect it at r', i', z', and Ys.
Bailey, Vanessa, Barman, Travis S., Briguglio, Runa, Close, Laird M., Follette, Katherine B., Hinz, Philip, Males, Jared R., Morzinski, Katie M., Puglisi, Alfio, Rodigas, Timothy J., Wu, Ya-Lin, Xompero, Marco   +11 more
core   +2 more sources

Benjamín Thomson, Count Rumford

Revista CENIC Ciencias Químicas, 2016
Benjamin Thomson, Count Rumford (1752-1814), was a self-educated scientist, military man, and political economist, living during the turbulent period of the American Revolution and the European Wars of the 18th and 19th centuries. He carried on important
Jaime Wisniak
doaj  

Discovery of two L & T binaries with wide separations and peculiar photometric properties

, 2011
We present spatially resolved photometric and spectroscopic observations of two wide brown dwarf binaries uncovered by the SIMP near-infrared proper motion survey.
Allen, Allers, Artigau, Artigau, Boss, Bowler, Bowler, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burningham, Burrows, Burrows, Chiu, Damien Gratadour, David Lafrenière, Dupuy, Duquennoy, Geballe, Ghez, Jayawardhana, Jonathan Gagné, Kasper, Knapp, Konopacky, Konopacky, Lison Malo, Liu, Liu, Liu, Liu, Liu, Looper, Loïc Albert, Marley, Marley, Maxted, McElwain, McGovern, McLean, Metchev, Metchev, Michael Liu, Mohanty, Monet, Padoan, Padoan, Pravdo, Racine, Reid, Reiners, Reipurth, René Doyon, Salim, Schmidt, Scholz, Skrutskie, Stephens, Trent J. Dupuy, Zacharias, Étienne Artigau   +62 more
core   +2 more sources

Improving Optical Photo-z Estimates Using Submillimeter Photometry [PDF]

arXiv
Estimating the redshifts of distant galaxies is critical for determining their intrinsic properties, as well as for using them as cosmological probes. Measuring redshifts spectroscopically is accurate, but expensive in terms of telescope time, hence it has become common to measure `photometric' redshifts, which are fits to photometry taken in a number ...
arxiv  

Optical photometry of Sco X-2

Astronomy & Astrophysics, 1997
We present optical photometry of the galactic bulge low-mass X-ray binary GX 349+2 (Sco X-2) obtained in July 1993 and March 1996. Short-term variations up to one magnitude are present on time scales of a few hours, which are related to the known X-ray behaviour of the source.
O. Barziv, E. Kuulkers, R.M. Méndez, F. van der Hooft, P.J. Groot, M. van der Klis, C. Kemper, J.A. van Paradijs   +7 more
openaire   +2 more sources

Identification and Removal of Noise Modes in Kepler Photometry

, 2012
We present the Transiting Exoearth Robust Reduction Algorithm (TERRA) --- a novel framework for identifying and removing instrumental noise in Kepler photometry.
Erik A. Petigura, Geoffrey W. Marcy, Tenenbaum P., Van Cleve J. E.   +3 more
core   +1 more source

Millisecond optical photometry of the DQ Herculis objects

The Astronomical Journal, 1988
The results of millisecond optical photometry of the DQ Herculis stars EX Hya, H2252-035, V1223 Sgr, and AE Aqr obtained at the Las Campanas Observatory and Cerro Tololo Inter-American Observatory during the years 1985, 1986, and 1987 are reported. The data for coherent and incoherent features are searched for.
James N. Imamura, Thomas Y. Steiman-Cameron   +1 more
openaire   +2 more sources