Results 81 to 90 of about 20,255 (236)

Dissecting Galaxies with Quantitative Spectroscopy of the Brightest Stars in the Universe

, 2010
Measuring distances to galaxies, determining their chemical composition, investigating the nature of their stellar populations and the absorbing properties of their interstellar medium are fundamental activities in modern extragalactic astronomy helping ...
Allende Prieto, Beaulieu, Bonanos, Bono, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Deharveng, Denicolo, Dopita, Evans, Fiorentino, Freedman, Garnett, Gieren, Gieren, Gieren, Humphreys, Kaufer, Kennicutt, Kewley, Kewley, Kobulnicky, Komatsu, Kudritzki, Kudritzki, Kudritzki, Lequeux, Macri, Mager, Magrini, Maiolino, Marconi, McCarthy, McCarthy, McGaugh, Meynet, Mould, Mould, Mould, Pettini, Pietrzynski, Pilyugin, Przybilla, Przybilla, Przybilla, Przybilla, Przybilla, Przybilla, Riess, Riess, Rizzi, Rosolowsky, Rubin, Saha, Sakai, Sandage, Schiller, Schlegel, Spergel, Tegmark, Tremonti, U, Urbaneja, Urbaneja, Urbaneja, Venn, Venn, Venn, Venn, Vilchez, Vlajic, Willner, Zaritski   +76 more
core   +1 more source

The Effect of a Nonuniversal Extinction Curve on the Wesenheit Function and Cepheid Distances

The Astrophysical Journal Letters
The Wesenheit function is widely used to reduce the effects of interstellar reddening in distance measurements. Its construction, however, relies on the assumption of a universal extinction curve and on fixed values of the total-to-selective extinction ...
Dorota M. Skowron, Morgan Fouesneau, Ronald Drimmel, Shourya Khanna   +3 more
doaj   +1 more source

The 2000 outburst of the recurrent nova CI Aquilae: optical spectroscopy

, 2000
We present low- and medium resolution spectra of the recurrent nova CI Aquilae taken at 14 epochs in May and June, 2000. The overall appearance is similar to other U Sco-type recurrent novae (U Sco, V394 CrA).
Anupama, Capaccioli, Della Valle, Duerbeck, G. Fűrész, Gill, J. R. Thomson, Jenniskens, K. Sziládi, L. L. Kiss, Mazuk, Munari, Munari, Oudmaijer, Reinmuth, Schmidt, Sekiguchi, Sekiguchi, Szkody, Takamizawa, W. Ogloza, Williams, Williams   +22 more
core   +1 more source

Three-dimensional Reddening Maps of the Magellanic Clouds Constructed by RR Lyrae Stars

The Astronomical Journal
We present the first three-dimensional reddening maps of the Large and Small Magellanic Clouds (LMC and SMC) constructed using fundamental-mode RR Lyrae stars (RRab) from the Optical Gravitational Lensing Experiment (OGLE) survey.
Shun-Xuan He, Yang Huang
doaj   +1 more source

Overlapping Open Clusters NGC 1750 and NGC 1758 behind the Taurus Dark Clouds. II. CCD Photometry in the Vilnius System

Open Astronomy, 2003
Seven-color photometry in the Vilnius system has been obtained for 420 stars down to V = 16 mag in the area containing the overlapping open clusters NGC 1750 and NGC 1758 in Taurus.
Straižys V., Kazlauskas A., Černiauskas A., Boyle R. P., Vrba F. J., Philip A. G. Davis, Laugalys V., Černis K., Smriglio F.   +8 more
doaj   +1 more source

Mass–Metallicity Relationship of SDSS Star-forming Galaxies: Population Synthesis Analysis and Effects of Star Burst Length, Extinction Law, Initial Mass Function, and Star Formation Rate

The Astrophysical Journal, 2023
We investigate the mass–metallicity relationship of star-forming galaxies by analyzing the absorption line spectra of ∼200,000 galaxies in the Sloan Digital Sky Survey.
Eva Sextl, Rolf-Peter Kudritzki, H. Jabran Zahid, I-Ting Ho   +3 more
doaj   +1 more source

The Mira-based distance to the Galactic centre [PDF]

, 2018
Mira variables are useful distance indicators, due to their high luminosities and well-defined period-luminosity relation. We select 1863 Miras from SAAO and MACHO observations to examine their use as distance estimators in the Milky Way.
Casagrande, Luca, Nataf, David M., Qin, Wenzer, Wood, Peter R., Zakamska, Nadia   +4 more
core   +2 more sources

Blanco DECam Bulge Survey (BDBS). VI. Extinction Maps Toward Southern Galactic Bulge Globular Clusters

The Astrophysical Journal, 2023
We present wide-field, high resolution maps of the color excess for 14 globular clusters toward the Southern Galactic bulge. The maps were derived using Gaia EDR3 astrometry and stellar photometry from the Blanco DECam Bulge Survey, which is a deep, wide-
Justin A. Kader, Catherine A. Pilachowski, Christian I. Johnson, R. Michael Rich, Michael D. Young, Iulia T. Simion, William I. Clarkson, Scott Michael, Andrea Kunder, Anna Katherina Vivas, Andreas J. Koch-Hansen, Tommaso Marchetti   +11 more
doaj   +1 more source

Probing interstellar extinction near the 30 Doradus nebula with red giant stars

, 2013
We have studied the interstellar extinction in a field of 3' x 3' located about 6' SW of 30 Doradus in the Large Magellanic Cloud (LMC). Hubble Space Telescope observations in the U, B, V, I and Halpha bands reveal patchy extinction in this field.
De Marchi, Guido, Girardi, Leo, Panagia, Nino   +2 more
core   +1 more source

Mapping Interstellar Dust in the Foreground Outer Disk of Overlapping Galaxy Pair VV 191 with HST and JWST

The Astronomical Journal
VV 191 is a nearby ( z ∼ 0.05), overlapping (occulting) galaxy pair, where a multiple-armed spiral galaxy is backlit by an elliptical galaxy. The overlap is used to derive and map dust attenuation in two James Webb Space Telescope NIRCam filters (F090W ...
Clayton D. Robertson, Benne W. Holwerda, Jessica M. Berkheimer, Trevor Butrum, Ian Castellano, Kyle W. Cook, William C. Keel, Anton M. Koekemoer, Divya Patel, Maria del Carmen Polletta, Rogier A. Windhorst   +10 more
doaj   +1 more source