Results 21 to 30 of about 9,445 (119)
Spectroscopic survey of emission-line stars – I. B[e] stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 15 pages, 7 figures, accepted for publication in ...
Aret, Anna +2 more
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Infrared emission lines of Mg II in B stars [PDF]
Symposium - International Astronomical Union, 1994 Recently, Chang et. al. (1992) and Carlsson, Rutten and Shchukina (1992) (CRS) demonstrated the non-LTE formation mechanism behind the 12 μm Mg I emission lines (6g–7h, 6h–7i) observed in the solar spectrum (Murcray et. al., 1981). CRS stress the generality of this mechanism showing that it is a natural consequence of the recombination flow from the ...
T. A. Aaron Sigut, J. B. Lester
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On the Formation of Balmer Emission Lines in the Model Envelopes of Be Stars [PDF]
Symposium - International Astronomical Union, 1994 We consider the formation of the Balmer emission lines and the decrement Hα/Hβ/Hγ, by solving the non-LTE problems in elementary regions of the envelope divided by equal line-of-sight velocities. These envelope-elements are characterized by different optical depths in the Balmer lines and by different dilution factors for the incident stellar radiation.
T. Kogure, S. Suzuki, M. Mon
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Spectroscopy of unusual emission-line stars
The Astronomical Journal, 1988 New spectroscopic observations are reported for ten stars that have been identified in the literature as having H-alpha emission with suspected F, G, or K spectral types. Three of the stars are shown to be BE stars, two are confirmed as early-type supergiants, three show composite (F or K + B) spectra, one is a 'post-T Tauri' star, and one is an ...
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Orbits and outflows of emission-line stars
, 2021 The optical spectra of some stars exhibit spectral lines in emission, which is characteristic of them having powerful radiatively driven winds. These stars are known as emission-line stars. In this thesis, I study the orbits and outflows of the most luminous and massive emission-line stars: Luminous Blue Variables and Wolf-Rayet stars.
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Non-emission-line young stars of intermediate mass [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 7 pages, 5 figures, accepted by ...
Manoj, P., Maheswar, G., Bhatt, H. C.
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(Sub)millimeter emission lines of molecules in born-again stars [PDF]
Astronomy & Astrophysics, 2017 7 pages, 4 figures and 3 tables.
D. Tafoya +9 more
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Symbiotic stars and other Hα emission-line stars towards the Galactic bulge★ [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 Symbiotic stars are interacting binaries with the longest orbital periods and their multi-component structure makes them rich astrophysical laboratories. The accretion of a high mass loss rate red giant wind on to a white dwarf (WD) makes them promising Type Ia supernovae (SNe Ia) progenitors.
B. Miszalski +2 more
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Star Clusters in Quasars: Bloated Stars as Broad Emission Line Clouds [PDF]
Symposium - International Astronomical Union, 1989 Many scenarios of the evolution of star clusters in the centers of galaxies involve the formation of a central supermassive object. Since black hole formation is not 100% efficient in mass usage, stars are left over. This paper investigates the properties of such stars and proposes that their externally heated atmospheres become “bloated” due to ...
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Linear Spectropolarimetry of Young and Other Emission Line Stars [PDF]
, 2006 The aim of this article is to demonstrate the useful role that can be played by spectropolarimetric observations of young and evolved emission line stars that analyse the linearly polarized component in their spectra. At the time of writing, this demonstration has to be made on the basis of optical data since there is no common-user infrared facility ...
Drew, Janet +4 more
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