Results 61 to 70 of about 22,353 (228)

New Astronomical Observatory Design for the Detection and Tracking of Satellite Objects: The Satellite Robotic Observatory (SRO)

open access: yesRemote Sensing
Robotic Astronomical Observatories (RAOs) have provided very good results in different research projects in astrophysics/astronomy. Their applications in the detection, tracking, and identification of near-Earth objects have contributed to the ...
Francisco Espartero   +3 more
doaj   +1 more source

Optical Multicolor Photometry of Spectrophotometric Standard Stars

open access: yesThe 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   +4 more
openaire   +3 more sources

Flickers, Bursts, and Dips: Detecting Rapid Variability with the g(2) Autocorrelation Function

open access: yesThe Astrophysical Journal
Rapid optical transient events can be hard to detect because of the limited number of photons they produce. I discuss a method of inferring the presence of fast, chaotic variability in photometry using the normalized autocorrelation function, what is ...
Brian C. Lacki
doaj   +1 more source

Resolving Stellar Populations outside the Local Group: MAD observations of UKS2323-326 [PDF]

open access: yes, 2008
We present a study aimed at deriving constraints on star formation at intermediate ages from the evolved stellar populations in the dwarf irregular galaxy UKS2323-326.
A. Baruffolo   +40 more
core   +1 more source

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

open access: yes, 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   +58 more
core   +2 more sources

Detection of the Sgr A* activity at 3.8 and 4.8 microns with NACO

open access: yes, 2004
L'-band (lambda=3.8 microns) and M'-band (lambda=4.8 microns) observations of the Galactic Center region, performed in 2003 at VLT (ESO) with the adaptive optics imager NACO, have lead to the detection of an infrared counterpart of the radio source Sgr A*
Balick   +35 more
core   +1 more source

Demonstrating high-precision photometry with a CubeSat: ASTERIA observations of 55 Cancri e [PDF]

open access: yes, 2020
ASTERIA (Arcsecond Space Telescope Enabling Research In Astrophysics) is a 6U CubeSat space telescope (10 cm x 20 cm x 30 cm, 10 kg). ASTERIA's primary mission objective was demonstrating two key technologies for reducing systematic noise in photometric ...
Babuscia, Alessandra   +21 more
core   +2 more sources

Optical CCD photometry of the microquasar LS 5039 [PDF]

open access: yesAstronomy & Astrophysics, 2004
We report optical CCD observations of the microquasar LS 5039. Its photometric behaviour is studied over differ- ent orbital periods with a time separation of three years. We do not detect evidences of an ellipsoidal modulation above the ±0.01 mag level, thus confirming the previous results reported by Clark et al. (2001).
Josep Martí   +4 more
openaire   +1 more source

High Speed Optical Photometry of LMXBs and CVs [PDF]

open access: yesProceedings of the International Astronomical Union, 2012
AbstractHigh speed photometry of several accreting binaries was obtained using the McDonald Observatory 2.1m telescope and ARGOS CCD photometer. A broad-band filter (BVR) was used in order to maximize flux and maintain a short (1-10s) integration time on faint targets.
Lorena Monroy   +6 more
openaire   +2 more sources

Lucky Imaging Adaptive Optics of the brown dwarf binary GJ569Bab

open access: yes, 2011
The potential of combining Adaptive Optics (AO) and Lucky Imaging (LI) to achieve high precision astrometry and differential photometry in the optical is investigated by conducting observations of the close 0\farcs1 brown dwarf binary GJ569Bab.
A. Díaz-Sánchez   +51 more
core   +3 more sources

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