Results 31 to 40 of about 6,638 (169)

Contemporaneous Observations of Hα Luminosities and Photometric Amplitudes for M Dwarfs

The Astronomical Journal, 2023
While many M dwarfs are known to have strong magnetic fields and high levels of magnetic activity, we are still unsure about the properties of their starspots and the origin of their magnetic dynamos.
Aylin García Soto, Elisabeth R. Newton, Stephanie T. Douglas, Abigail Burrows, Aurora Y. Kesseli   +4 more
doaj   +1 more source

Improved GALEX UV Photometry for 700,000 SDSS Galaxies

The Astrophysical Journal Supplement Series, 2023
The Galaxy Evolution Explorer (GALEX) satellite performed the first and only large-area UV survey, which in tandem with the Sloan Digital Sky Survey (SDSS) has facilitated modeling of the spectral energy distributions of low-redshift galaxies and the ...
Chandler Osborne, Samir Salim, Médéric Boquien, Mark Dickinson, Stéphane Arnouts   +4 more
doaj   +1 more source

Autonomous Observations in Antarctica with AMICA

Advances in Astronomy, 2010
The Antarctic Multiband Infrared Camera (AMICA) is a double channel camera operating in the 2–28 𝜇m infrared domain (KLMNQ bands) that will allow to characterize and exploit the exceptional advantages for Astronomy, expected from Dome C in Antarctica ...
Gianluca Di Rico, Maurizio Ragni, Mauro Dolci, Oscar Straniero, Angelo Valentini, Gaetano Valentini, Amico Di Cianno, Croce Giuliani, Demetrio Magrin, Carlotta Bonoli, Favio Bortoletto, Maurizio D'Alessandro, Leonardo Corcione, Alberto Riva   +13 more
doaj   +1 more source

TWO-MIRROR OBJECTIVE WITH PLANE FIELD

Наука и техника, 2006
The paper considers a light-strong anastigmat with plane field that consists of two aspherical mirrors. Calculation of design parameters is given in the paper.
N. K. Artioukhina, A. V. Bogatko
doaj   +1 more source

The Effect of Starspots on Spectroscopic Age and Mass Estimates of Nonaccreting T Tauri Stars in the Taurus–Auriga Star-forming Region

The Astrophysical Journal
Accurate age and mass determinations for young pre-main-sequence stars are made challenging by the presence of large-scale starspots. We present results from a near-infrared spectroscopic survey of 10 T-Tauri Stars in Taurus-Auriga that characterize spot-
Facundo Pérez Paolino, Jeffrey S. Bary, Lynne A. Hillenbrand, Madison Markham   +3 more
doaj   +1 more source

Kinematical and dynamical properties of recently discovered bulge and disc star clusters with WINERED

Astronomy & Astrophysics
Context. Galactic globular clusters are a very important tool in explaining the characteristics of the Milky Way. Therefore it is essential to determine the kinematical and dynamical properties of the new star cluster candidates, especially at the low ...
Petralia Ilaria, Minniti Dante, Fernández-Trincado José G., Matsunaga Noriyuki, Taniguchi Daisuke, Saroon Sasi, Garro Elisa R., Sameshima Hiroaki, Otsubo Shogo, Sarugaku Yuki, Takeuchi Tomomi   +10 more
doaj   +1 more source

How Accurately Can Obscured Galaxy Luminosities Be Measured Using Spectral Energy Distribution Fitting of Near- through Far-infrared Observations?

The Astrophysical Journal
Infrared-luminous galaxies are important sites of stellar and black hole mass assembly at most redshifts. Their luminosities are often estimated by fitting spectral energy distribution (SED) models to near- to far-infrared data, but the dependence of ...
Duncan Farrah, Kiana Ejercito, Andreas Efstathiou, David Leisawitz, Athena Engholm, Irene Shivaei, Matteo Bonato, David L. Clements, Sara Petty, Lura. K. Pitchford, Charalambia Varnava, Jose Afonso, Carlotta Gruppioni, Evanthia Hatziminaoglou, Andrew Hoffman, Mark Lacy, Brenda C. Matthews, Conor Nixon, Chris Pearson, Berke Vow Ricketti, Dimitra Rigopoulou, Loren Robinson, Locke D. Spencer, Lingyu Wang, David B. Sanders, Gerard van Belle   +25 more
doaj   +1 more source

On the Limitations of the Anomalous Microwave Emission Emissivity

Advances in Astronomy, 2012
Many studies of anomalous microwave emission (AME) have computed an AME emissivity to compare the strength of the AME detected in different regions. Such a value is usually defined as the ratio between the intensity of the AME at 1 cm and the thermal ...
Christopher T. Tibbs, Roberta Paladini, Clive Dickinson   +2 more
doaj   +1 more source

Shadow-based Framework for Estimating Transition Disk Geometries

The Astrophysical Journal
Some transition disks host misaligned inner disks with radii of several astronomical units. Understanding the geometric and physical properties of these misaligned disks is essential for advancing terrestrial planet formation models.
Ryuta Orihara, Munetake Momose
doaj   +1 more source

Variable Stars in M31 Stellar Clusters from the Panchromatic Hubble Andromeda Treasury

The Astrophysical Journal
Variable stars in stellar clusters can offer key constraints on stellar evolution and pulsation models, utilizing estimates of host cluster properties to constrain stellar physical parameters.
Richard Smith, Avi Patel, Monika D. Soraisam, Puragra Guhathakurta, Pranav Tadepalli, Sally Zhu, Joseph Liu, Léo Girardi, L. Clifton Johnson, Sagnick Mukherjee, Knut A. G. Olsen, Benjamin F. Williams   +11 more
doaj   +1 more source