Results 141 to 150 of about 39,482 (251)

Making the Invisible Visible: Magnetic Fields in Accretion Flows Revealed by X-Ray Polarization

The Astrophysical Journal
Large-scale, strong magnetic fields are often evoked in black hole accretion flows, for jet launching in the low/hard state and to circumvent the thermal instability in the high/soft state.
Samuel Barnier, Chris Done
doaj   +1 more source

The photosphere and veiling spectrum of T Tauri stars [PDF]

, 2003
H. C. Stempels, N. Piskunov
openalex   +1 more source

Photospheric abundances: Problems, updates, implications

AIP Conference Proceedings, 2001
Current problems encountered in the spectroscopic determination of photospheric abundances are outlined and exemplified in a reevaluation of C, N, O, Ne, Mg, Si, and Fe, taking effects of NLTE and granulation into account. Updated abundances of these elements are given in Table 2.
openaire   +2 more sources

Measuring the magnetic fields in the chromospheres of low-mass stars. [PDF]

Nat Commun
Cang T, Petit P, Donati JF, Tian H, Fu J, Li H, Bellotti S, Hu X, Ma X, Lopez Ariste A, Xing K, Morin J, Lu H, Zong W.   +13 more
europepmc   +2 more sources

Analysis of Solar Surface Oscillations and Energy Transport with Bispectral Electronic Thermostatistics

The Astrophysical Journal
The ubiquitous 5 minute solar p -mode oscillations, excited at the photosphere, play a crucial role in driving various coronal instabilities and mediating upward energy transport. These modes are strongly influenced by nonthermal electron populations. To
Souvik Das, Pralay Kumar Karmakar
doaj   +1 more source

Chemical composition of photospheres in RS CVn stars [PDF]

, 2012
G. Tautvaišienė, G. Barisevičius, S. V. Berdyugina, I. Ilyin, Y. Chorniy   +4 more
openalex   +1 more source

Vortex Motions in the Solar Atmosphere: Definitions, Theory, Observations, and Modelling. [PDF]

Space Sci Rev, 2023
Tziotziou K, Scullion E, Shelyag S, Steiner O, Khomenko E, Tsiropoula G, Canivete Cuissa JR, Wedemeyer S, Kontogiannis I, Yadav N, Kitiashvili IN, Skirvin SJ, Dakanalis I, Kosovichev AG, Fedun V.   +14 more
europepmc   +1 more source

Discovery and Detailed Study of the M31 Classical Nova AT 2023tkw: Evidence for Internal Shocks

The Astrophysical Journal
We present a detailed analysis of an extragalactic slow classical nova in M31 exhibiting multiple peaks in its light curve. Spectroscopic and photometric observations were used to investigate the underlying physical processes.
Judhajeet Basu, Ravi Kumar, G.C. Anupama, Sudhanshu Barway, Peter H. Hauschildt, Shatakshi Chamoli, Vishwajeet Swain, Varun Bhalero, Viraj Karambelkar, Mansi Kasliwal, Kaustav K. Das, Igor Andreoni, Avinash Singh, Rishabh Singh Teja   +13 more
doaj   +1 more source

Non‐LTE Treatment of Molecules in the Photospheres of Cool Stars [PDF]

, 2000
Andreas Schweitzer, Peter H. Hauschildt, E. Baron   +2 more
openalex   +1 more source

Effects of a twisted magnetic rope at the stage of the appearance of a new active region in the photosphere

Solar-Terrestrial Physics
Using SDO/HMI data, we have studied the dynamics of small-scale magnetic field elements in the photosphere during the formation of small active region USAF/NOAA 12761.
Grigoryev Victor, Ermakova Lyudmila
doaj   +1 more source