Results 21 to 30 of about 563,854 (280)
Radial velocities of early-type stars [PDF]
Symposium - International Astronomical Union, 1970 With the Fehrenbach objective prism radial velocities of about 700 stars of type B0 to A0 were determined in two fields of the Southern Milky Way (lII = 295° bII = −0.6°; lII = 320° bII = −2.5°), with a mean error of ±20 km s−1. An additional photographic UBV-photometry with plates of the ADH-telescope at Boyden Observatory was accomplished.
openaire +1 more source
New Methods in Modeling of Hot Stellar Atmospheres
Open Astronomy, 2013 In the present study we had three main aims. First to study the possibility of reducing the initial model atmosphere data to short analytical polynomials.
Sapar A., Poolamäe R., Sapar L.
doaj +1 more source
Post-outburst Evolution of Bona Fide FU Ori-type V2493 Cygnus: A Spectro-photometric Monitoring
The Astrophysical Journal, 2023 We present here the results of 8 yr of our near-simultaneous optical–near-infrared spectro-photometric monitoring of the bona fide FU Ori (FUor)-type candidate V2493 Cygnus (V2493 Cyg) starting from 2013 September to 2021 June.
Arpan Ghosh +13 more
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Early-type stars in the core of the young open cluster Westerlund2 [PDF]
, 2006 Aims. The properties of the early-type stars in the core of the Westerlund2 cluster are examined in order to establish a link between the cluster and the very massive Wolf-Rayet binary WR20a as well as the HII complex RCW49. Methods.
A. F. J. Moffat +48 more
core +8 more sources
A New High-Precision Correction Method of Temperature Distribution in Model Stellar Atmospheres
Open Astronomy, 2013 The main features of the temperature correction methods, suggested and used in modeling of plane-parallel stellar atmospheres, are discussed. The main features of the new method are described.
Sapar A., Poolamäe R., Sapar L.
doaj +1 more source
Tidal friction in early-type stars [PDF]
The Astrophysical Journal, 1989 The tidal torque on an early-type star is concentrated near the boundary between the convective core and radiative envelope and a train of gravity waves is excited there. The angular momentum which the torque removes from the fluid is transported outward by the gravity waves, which carry negative angular momentum.
Goldreich, Peter, Nicholson, Philip D.
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Chemical Abundances of Early Type Stars [PDF]
Symposium - International Astronomical Union, 1998 X-rays from early-type stars are emitted by the corona or the stellar wind. The materials in the surface layer of early-type stars are not contaminated by nuclear reactions in the stellar inside. Therefore, abundance study of the early-type stars provides us an information of the abundances of the original gas.
S. Tanaka +5 more
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The coupling of a young stellar disc with the molecular torus in the Galactic centre
, 2010 The Galactic centre hosts, according to observations, a number of early-type stars. About one half of those which are orbiting the central supermassive black hole on orbits with projected radii $\gtrsim$ 0.03 pc form a coherently rotating disc ...
Aarseth +28 more
core +1 more source
Magnetic fields in non-convective regions of stars [PDF]
Royal Society Open Science, 2017 We review the current state of knowledge of magnetic fields inside stars, concentrating on recent developments concerning magnetic fields in stably stratified (zones of) stars, leaving out convective dynamo theories and observations of convective ...
Jonathan Braithwaite, Henk C. Spruit
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Adaptive Optics Near-Infrared Spectroscopy of the Sgr A* Cluster
, 2002 We present K-band $\lambda/\Delta\lambda$ ~ 2600 spectroscopy of five stars (K ~ 14 - 16 mag) within 0.''5 of Sgr A*, the radio source associated with the compact massive object suspected to be a 2.6 x 10$^{6}$ \msun black hole at the center of our ...
A. M. Ghez +7 more
core +2 more sources