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