Results 71 to 80 of about 64,703 (265)

The JWST Resolved Stellar Populations Early Release Science Program. V. DOLPHOT Stellar Photometry for NIRCam and NIRISS

The Astrophysical Journal Supplement Series
We present NIRCam and NIRISS modules for DOLPHOT, a widely used crowded-field stellar photometry package. We describe details of the modules including pixel masking, astrometric alignment, star finding, photometry, catalog creation, and artificial star ...
Daniel R. Weisz, Andrew E. Dolphin, Alessandro Savino, Kristen B. W. McQuinn, Max J. B. Newman, Benjamin F. Williams, Nitya Kallivayalil, Jay Anderson, Martha L. Boyer, Matteo Correnti, Marla C. Geha, Karin M. Sandstrom, Andrew A. Cole, Jack T. Warfield, Evan D. Skillman, Roger E. Cohen, Rachael Beaton, Alessandro Bressan, Alberto Bolatto, Michael Boylan-Kolchin, Alyson M. Brooks, James S. Bullock, Charlie Conroy, Michael C. Cooper, Julianne J. Dalcanton, Aaron L. Dotter, Tobias K. Fritz, Christopher T. Garling, Mario Gennaro, Karoline M. Gilbert, Leo Girardi, Benjamin D. Johnson, L. Clifton Johnson, Jason Kalirai, Evan N. Kirby, Dustin Lang, Paola Marigo, Hannah Richstein, Edward F. Schlafly, Erik J. Tollerud, Andrew Wetzel   +40 more
doaj   +1 more source

BVR CCD Photometric observation analysis of spiral galaxy Ic 467

Iraqi Journal of Physics, 2019
The structure and composition of the stellar population in the surface brightness galaxy Ic 467 is studied using BVR CCD photometry. The observations were obtained on the 1.88m optical telescope of Kottamia Astronomical Observatory, KAO, Egypt.
Sinan H. Ali
doaj   +1 more source

The Whole is Greater than the Sum of the Parts: Optimizing the Joint Science Return from LSST, Euclid and WFIRST [PDF]

, 2015
The focus of this report is on the opportunities enabled by the combination of LSST, Euclid and WFIRST, the optical surveys that will be an essential part of the next decade's astronomy.
Bean, R., Connolly, A., Dell'antonio, I., Frieman, J., Gawiser, E., Gehrels, N., Gladney, L., Heitmann, K., Helou, G., Hirata, C., Ho, S., Ivezić, Ž., Jain, B., Jarvis, M., Kahn, S., Kalirai, J., Kim, A., Lupton, R., Mandelbaum, R., Marshall, P., Newman, J. A., Perlmutter, S., Postman, M., Rhodes, J., Spergel, D., Strauss, M. A., Tyson, J. A., Walkowicz, L., Wood-Vasey, W. M.   +28 more
core   +1 more source

Deep photometry of the Draco dwarf spheroidal galaxy [PDF]

The Astronomical Journal, 1986
We report the results of deep CCD photometry of two overlapping fields in the Draco dwarf spheroidal galaxy. We find (B-V)o,g = m0.69, indicating a mean [Fe/H] = −2.0. The width of the giant branch below the horizontal branch is somewhat wider than our observational errors permit, from which we infer there is a spread in metallicities amongst the Draco
Bruce W. Carney, P. Seitzer
openaire   +1 more source

On the Age Distribution of Classical Cepheids in the Galaxy

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
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

Machine Learning versus Spectral Energy Distribution Fitting: A Comparative Analysis of Accuracy in Stellar Mass Estimation

The Astrophysical Journal
Traditional spectral energy distribution (SED)–fitting methods for stellar mass estimation face persistent challenges including systematic biases and computational constraints.
Vahid Asadi, Akram Hasani Zonoozi, Hosein Haghi   +2 more
doaj   +1 more source

The Nature of Starbursts: I. The Star Formation Histories of Eighteen Nearby Starburst Dwarf Galaxies

, 2010
We use archival HST observations of resolved stellar populations to derive the star formation histories (SFHs) of 18 nearby starburst dwarf galaxies.
Aloisi, Andrew Dolphin, Angeretti, Annibali, Aparicio, Benjamin Williams, Bertelli, Bolatto, Bottinelli, Cannon, Cannon, Cole, Colless, Daniel Weisz, David Stark, de Blok, de Vaucouleurs, Dohm-Palmer, Drozdovsky, Drozdovsky, Evan D. Skillman, Gieren, Gil de Paz, Gogarten, Grocholski, Harris, Harris, Heckman, Heckman, Heydari-Malayeri, Holtzman, Holtzman, Huchtmeier, Huchtmeier, Israel, Israel, John M. Cannon, Jon Holtzman, Julianne Dalcanton, Karachentsev, Kaviraj, Kennicutt, Kristen B. W. McQuinn, Lee, Lee, Leroy, López-Sánchez, Madau, Marlowe, Marlowe, Mas-Hesse, Mayer, McQuinn, McQuinn, Meurer, Méndez, Nishi, O'Connell, Oey, Omukai, Sakai, Scalo, Schaerer, Schlegel, Sebastian Hidalgo-Rodríguez, Skillman, Skillman, Skillman, Spaans, Taylor, Thornley, Tremonti, Tully, van Zee, van Zee, Walter, Weisz, Williams, Wilson   +78 more
core   +1 more source

Lactea: Web‐Based Spectrum‐Preserving Multi‐Resolution Visualization of the GAIA Star Catalog

Computer Graphics Forum, Volume 44, Issue 3, June 2025.
Abstract The explosion of data in astronomy has resulted in an era of unprecedented opportunities for discovery. The GAIA mission's catalog, containing a large number of light sources (mostly stars) with several parameters such as sky position and proper motion, is playing a significant role in advancing astronomy research and has been crucial in ...
Reem Alghamdi, Markus Hadwiger, Guido Reina, Alberto Jaspe‐Villanueva   +3 more
wiley   +1 more source

Infrared Imaging and Photometry of a Sample of Seyfert Galaxies [PDF]

Symposium - International Astronomical Union, 1989
It is well know that the determination of the local luminosity function of Seyfert nuclei meets several difficulties produced by: the determination of a suitable sample, the estimation of the nuclear magnitudes biased from the contribution from the host galaxies, which may be dominant if the nucleus is faints and the presumably large errors associated ...
ZITELLI V, WADE R, Danese, Luigi, DEZOTTI G, GRANATO G, MANDOLESI N.   +5 more
openaire   +2 more sources

Review of asteroid, meteor, and meteorite‐type links

Meteoritics &Planetary Science, Volume 60, Issue 4, Page 928-973, April 2025.
Abstract With the goal to determine the origin of our meteorites in the asteroid belt, video and photographic observations of meteors have now tracked 75 meteorite falls. Six years ago, there were just hints that different meteorite types arrived on different orbits, but now, the number of orbits (N) is high enough for distinct patterns to emerge.
Peter Jenniskens, Hadrien A. R. Devillepoix   +1 more
wiley   +1 more source