Results 101 to 110 of about 482,777 (285)

MCAO near-IR photometry of the Globular Cluster NGC 6388: MAD observations in crowded fields

, 2008
Deep photometry of crowded fields, such as Galactic Globular Clusters, is severely limited by the actual resolution of ground-based telescopes. On the other hand, the Hubble Space Telescope does not provide the near-infrared (NIR) filters needed to allow
A. Baruffolo, A. Moretti, A. P. Milone, A. Sarajedini, Anderson, Anderson, Arcidiacono, Ashman, Bedin, Bedin, Busso, C. Arcidiacono, Caloi, Carretta, Cassisi, Catelan, D'Antona, D'Antona, De Angeli, E. Diolaiti, E. Marchetti, G. Piotto, Girardi, Gratton, Gullieuszik, Harris, Hawarden, Hughes, J. Anderson, J. Farinato, J. Kolb, L. R. Bedin, Lee, M. Lombini, Marchetti, Milone, Pancino, Penny, Pietrinferni, Piotto, Piotto, R. Brast, R. Donaldson, R. Falomo, R. Ragazzoni, Ragazzoni, Ragazzoni, Ragazzoni, Raimondo, Rich, Rich, S. Tordo, Salaris, Sarajedini, Schlegel, Sirianni, Stetson, Valenti, Yoon   +58 more
core   +2 more sources

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

Optical Multicolor Photometry of Spectrophotometric Standard Stars

The Astronomical Journal, 2007
76 pages, 48 figures - published version available here: http://www.journals.uchicago.edu/AJ/journal/issues/v133n3/205588/205588.html .
Arlo U. Landolt, Arlo U. Landolt, Arlo U. Landolt, Alan Uomoto, Alan Uomoto   +4 more
openaire   +3 more sources

Gaia Search for Stellar Companions of TESS Objects of Interest V

Astronomische Nachrichten, EarlyView.
ABSTRACT In this paper, we present the latest results of our ongoing multiplicity survey of (Community) TESS Objects of Interest, using astrometry and photometry from the latest data release of the ESA Gaia mission to detect stellar companions of these stars and to characterize their properties.
Markus Mugrauer, Ann‐Kathrin Kollak, Lara Pietsch, Kai‐Uwe Michel   +3 more
wiley   +1 more source

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

On the Age Distribution of Classical Cepheids in the Galaxy

Astronomische Nachrichten, EarlyView.
ABSTRACT We revisit the problem of the positive correlation between age and Galactocentric distance seen in Galactic Classical Cepheids, which at first sight may seem counter‐intuitive in the context of inside‐out galaxy formation. To explain it, we use the Besançon Galaxy Model and a simulation of star particles in the Galactic disc coupled with ...
Friedrich Anders, Chloé Padois, Marc Vilanova Sar, Marcin Semczuk, Marc del Alcázar‐Julià, Francesca Figueras   +5 more
wiley   +1 more source

Precision of a Low-Cost InGaAs Detector for Near Infrared Photometry [PDF]

, 2013
We have designed, constructed, and tested an InGaAs near-infrared camera to explore whether low-cost detectors can make small (<1 m) telescopes capable of precise (<1 mmag) infrared photometry of relatively bright targets. The camera is constructed around the 640x512 pixel APS640C sensor built by FLIR Electro-Optical Components.
arxiv   +1 more source

Luminous Red Galaxies: Selection and classification by combining optical and infrared photometry [PDF]

ApJ 803 105 (2015), 2015
We describe a new method of combining optical and infrared photometry to select Luminous Red Galaxies (LRGs) at redshifts $z > 0.6$. We explore this technique using a combination of optical photometry from CFHTLS and HST, infrared photometry from the WISE satellite, and spectroscopic or photometric redshifts from the DEEP2 Galaxy Redshift Survey or ...
arxiv   +1 more source

A novel treatment of biogas digestate waste for biochar production and its adsorption of methylene blue and malachite green in a binary system

Biofuels, Bioproducts and Biorefining, EarlyView.
Abstract This study presents a novel treatment of biogas digestate to produce biochar at processing temperatures of 500–700 °C. The resulting biochar was applied for the simultaneous removal of methylene blue (MB) and malachite green (MG) in a binary system.
Van Hau Duong, Pham Xuan Phuong, Phan Thi Duy Thuan, Altyn Taisheva, Dinh Van Dung, Le Dinh Phung, Nguyen Thi Hong Bich, Nguyen Duy Luu, Dinh Quang Khieu, Filip Mercl, Hynek Roubík   +10 more
wiley   +1 more source

Multiwavelength spectral and high time resolution observations of SWIFT J1753.5-0127: new activity? [PDF]

, 2008
We have conducted an extensive observational campaign of SWIFT J1753.5-0127 during June 2007 after its bright outburst episode in 2005. We have performed multi-band optical photometry, optical spectroscopy, X-ray spectroscopy and timing and ULTRACAM optical photometry simultaneously in three bands.
arxiv   +1 more source