Results 61 to 70 of about 313,515 (389)

Experience in CCD Photometry at the Tartu Observatory

Open Astronomy, 2003
We give overview of the CCD instrumentation and data reduction techniques used at the Tartu Observatory. The first results from photometric observations of the peculiar variable V838 Mon are presented.
Tuvikene T., Kolka I.
doaj   +1 more source

Efficiency of BRDF sampling and bias on the average photometric behavior [PDF]

, 2018
The Hapke model has been widely used to describe the photometrical behavior of planetary surface through the Bi-directional Reflectance Distribution Function (BRDF), but the uncertainties about retrieved parameters has been difficult to handle so far.
arxiv   +1 more source

Photometric Redshifts for Galaxies in the GOODS Southern Field

, 2003
We use extensive multi-wavelength photometric data from the Great Observatories Origins Deep Survey (GOODS) to estimate photometric redshifts for a sample of 434 galaxies with spectroscopic redshifts in the Chandra Deep Field South.
Benitez, N., Bonn, Cimatti, A., Cristiani, S., Daddi, E., Dahlen, T., di Arcetri, Osservatorio Astrofisico, di Bologna, Osservatorio Astrofisico, di Trieste, Osservatorio Astronomico, Dickinson, M., Erben, T., ESO, Ferguson, H. C., Giavalisco, M., Grogin, N. A., Idzi, R., JHU, JPL, Koekemoer, A. M., Mignoli, M., Mobasher, B., Moustakas, L. A., Nonino, M., Oxford, Rosati, P., Schirmer, M., Stern, D., STScI, Vanzella, E., Wolf, C., Zamorani, G.   +30 more
core   +1 more source

Atmospheric Extinction Corrections for WET Observations

Open Astronomy, 2003
Account of the extinction in the Earth’s atmosphere is an important part of the WET light curve reduction procedures. Usually, WET observations are not corrected for the second order extinction effects: the dependence of the extinction coefficient on ...
Pakštienė E., Solheim J. E.
doaj   +1 more source

Photometric Sensing of Active Chlorine, Total Chlorine, and pH on a Microfluidic Chip for Online Swimming Pool Monitoring

Sensors, 2020
A microfluidic sensor was studied for the photometric detection of active chlorine, total chlorine, and pH in swimming pool samples. The sensor consisted of a four-layer borosilicate glass chip, containing a microchannel network and a 2.2 mm path length,
Sait Elmas, Aneta Pospisilova, Aneta Anna Sekulska, Vasil Vasilev, Thomas Nann, Stephen Thornton, Craig Priest   +6 more
doaj   +1 more source

New Results from Long-time Photometric Study of UX Orionis Star GM Cephei [PDF]

arXiv, 2021
New results from long-term optical photometric observations of the pre-main sequence star GM Cep from UX Orionis type are reported. During ongoing photometric monitoring of the GM Cep four deep minimums in brightness are observed. The collected multicolour photometric data shows the typical of UXor variables colour reversal during the minimums in ...
arxiv  

The FORS Deep Field: Field selection, photometric observations and photometric catalog [PDF]

, 2002
The FORS Deep Field project is a multi-colour, multi-object spectroscopic investigation of an approx. 7 times 7 region near the south galactic pole based mostly on observations carried out with the FORS instruments attached to the VLT telescopes.
Appenzeller, I., Bender, R., Böhm, Armin, Drory, N., Fricke, K. J., Gabasch, A., Heidt, J., Hopp, U., Jäger, K., Kümmel, M., llenhoff, C., Mehlert, D., Moorwood, A., Möllenhoff, C., Nicklas, H., Noll, S., Saglia, R. P., Seifert, W., Seitz, S., Snigula, J., Stahl, O., Sutorius, E., Szeifert, T., Wagner, S. J., Ziegler, B.   +24 more
core   +2 more sources

On a New Technique for Discovering Variable Stars

Open Astronomy, 2003
A technique for discovering variable stars based on the calculation of the correlation coefficients is proposed. Applications of the technique are shown on the results of numerical experiments and on the Hipparcos photometric data.
Mironov A. V., Zakharov A. I., Nikolaev F. N.   +2 more
doaj   +1 more source

A Photometric Redshift Galaxy Catalog from the Red-Sequence Cluster Survey [PDF]

, 2005
The Red-Sequence Cluster Survey (RCS) provides a large and deep photometric catalog of galaxies in the $z'$ and $R_c$ bands for ~90 square degrees of sky, and supplemental $V$ and $B$ data have been obtained for 33.6 deg$^{2}$. We compile a photometric redshift catalog from these 4-band data by utilizing the empirical quadratic polynomial photometric ...
arxiv   +1 more source

IVOA Recommendation: IVOA Photometry Data Model

, 2013
The Photometry Data Model (PhotDM) standard describes photometry filters, photometric systems, magnitude systems, zero points and its interrelation with the other IVOA data models through a simple data model.
Allen, Mark, Apellaniz, Jesus Maiz, Baines, Deborah, Derriere, Sebastien, Hatziminaoglou, Evanthia, Lemson, Gerard, Louys, Mireille, McDowell, Jonathan, Osuna, Pedro, Rodrigo, Carlos, Salgado, Jesus   +10 more
core   +2 more sources