Results 41 to 50 of about 264 (177)

The deep eclipses of RW Aur revisited by long‐term photometric and spectroscopic monitoring

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract RW Aurigae is a young stellar system containing a classical T Tauri star as the primary component. It shows deep, irregular dimmings, first detected in 2010. At the University Observatory Jena, we carried out optical follow‐up observations. We performed multiband (BVRI) photometry of the system with the Cassegrain‐Teleskop‐Kamera II and the ...
Oliver Lux, Markus Mugrauer, Richard Bischoff   +2 more
wiley   +1 more source

An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST

The Astrophysical Journal
We present a direct measurement of extinction curves using corrected Gaia XP spectra of the common sources in Gaia DR3 and LAMOST DR7. Our analysis of approximately 370,000 high-quality samples yielded a high-precision average extinction curve for the ...
Ruoyi Zhang, Haibo Yuan, Bowen Huang, Tao Wang, Lin Yang, Gregory M. Green, Xiangyu Zhang   +6 more
doaj   +1 more source

Interstellar Reddening Towards S188, Hw4 and We1–6 [PDF]

Symposium - International Astronomical Union, 1993
Photoelectric UBV photometry of stars was carried out in the angular vicinity (radius = 15′) of 3 planetary nebulae. An extinction distance relation was constructed for the line of sight towards each planetary nebula. This relation was verified by published data on nearby stars and star clusters. The distances derived are 850 ± 300 pc for PK 128 −04 1 (
openaire   +1 more source

The Extinction Law in Type Ia Supernovae Hosts from Background Galaxy Measurements: Toward a 1% Determination of H0

The Astrophysical Journal
In the most precise distance ladder determination of H _0 , the observed near-infrared fluxes of Cepheids are corrected for dust, assuming that the extinction law in large, star-forming spiral hosts of Type Ia supernovae (SNe Ia) is similar to the Milky ...
Yukei S. Murakami, Adam G. Riess, Henry C. Ferguson, Alexei V. Filippenko, Thomas G. Brink, WeiKang Zheng, Daniel M. Scolnic   +6 more
doaj   +1 more source

oMEGACat. VII. Tracing Interstellar and Intracluster Medium of ω Centauri Using Sodium Absorptions

The Astrophysical Journal
We investigate the foreground interstellar medium along the line of sight and intracluster medium of ω Centauri ( ω Cen) by measuring the equivalent width of Na I D absorptions from MUSE observations. The large line-of-sight velocity difference between ω
Z. Wang, A. C. Seth, M. Latour, J. Strader, M. Häberle, N. Neumayer, C. Clontz, S. Kamann, M. S. Nitschai, M. Alfaro-Cuello, A. Bellini, A. Feldmeier-Krause, M. Libralato, A. P. Milone, P. J. Smith, S. O. Souza, G. van de Ven   +16 more
doaj   +1 more source

Large Interstellar Polarisation Survey

Astronomy & Astrophysics
Our understanding of dust in the diffuse interstellar medium remains incomplete with regard to the structure, composition, size distribution, and alignment properties of its grains.
Siebenmorgen Ralf, Bagnulo Stefano, Fanciullo Lapo, Vannieuwenhuyse Thomas, Guillet Vincent   +4 more
doaj   +1 more source

The Panchromatic Hubble Andromeda Treasury. XX. The Disk of M31 is Thick

The Astronomical Journal, 2023
We present a new approach to measuring the thickness of a partially face-on stellar disk, using dust geometry. In a moderately-inclined disk galaxy, the fraction of reddened stars is expected to be 50% everywhere, assuming that dust lies in a thin ...
Julianne J. Dalcanton, Eric F. Bell, Yumi Choi, Andrew E. Dolphin, Morgan Fouesneau, Léo Girardi, David W. Hogg, Anil C. Seth, Benjamin F. Williams   +8 more
doaj   +1 more source

On the Methods of Correction for the Interstellar Reddening of Planetary Nebulae [PDF]

Symposium - International Astronomical Union, 1968
Knowledge of the interstellar extinction is of great importance for the study of the properties of planetary nebulae. An estimate of the interstellar reddening for an individual nebula may be obtained by means of three independent methods. In the first method the observed Balmer decrement is compared with the theoretical decrement (case B of Baker and ...
openaire   +1 more source

Interstellar Reddening Effect on the Age Dating of Population II Stars

Galaxies, 2017
The age measurement of the stellar halo component of the Galaxy is based mainly on the comparison of the main sequence turn-off luminosity of the globular cluster (GC) stars with theoretical isochrones.
Sergio Ortolani, Santi Cassisi, Maurizio Salaris   +2 more
doaj   +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