Results 241 to 250 of about 10,060 (266)

Emission-line Stars and Early-type Stars with Gaia

EAS Publications Series, 2010
Gaia will provide accurate parallaxes, spectrophotometry and spectroscopy for hundreds of thousands of emission-line stars across the whole HR diagram. In preparation for the Gaia mission, we are developing algorithms to recognize and classify emission-line stars. A large collection of ground-based spectroscopic observations has been collected and will
R. Blomme, Y. Frémat, A. Lobel, C. Martayan   +3 more
openaire   +1 more source

The contribution of stars to the AGN line emission

AIP Conference Proceedings, 1992
It has been suggested that the presence of red giants in the vicinity of an active nucleus can contribute significantly to the line emission by the reprocessing of the continuum radiation onto the red giant’s surface or in the stellar wind that usually accompanies these stars. We present herein the line profiles and the corresponding transfer functions
Jason A. Taylor, Demosthenes Kazanas
openaire   +1 more source

Spectroscopic Observations of Emission-line Stars

Publications of the Astronomical Society of Australia, 1991
AbstractIn this paper we present the results of spectroscopic observations for 34 emission-line stars (ELSs) in the Orion belt region, which were detected in an extensive survery. Spectral classification and the intensities of Hα and Hβ emission have revealed that the observed ELSs are probably T-Tauri type stars.
T. Kogure, K. Ogua, M. Nakano, S. Yoshida   +3 more
openaire   +1 more source

Early-type Emission-line Stars

2007
Wolf-Rayet (WR) stars owe its name to the discoverers, C. Wolf and G. Rayet. They are one of the most conspicuous stellar objects in spectral features, activities, and in the processes of stellar evolution. They are spectroscopically characterized by the following features.
Tomokazu Kogure, Kam-Ching Leung
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The N III Emission Lines in the Of Stars

Publications of the Astronomical Society of the Pacific, 1973
Recent work has lead to an improved understanding of the physical mechanisms which produce the NIH emission lines in Of stars. The present status of the problem is briefly reviewed in this paper.
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Early-Type Emission-Line Stars

1982
Early-type emission-line stars keep the continuous interest of the scientists. As it is believed the emission lines are formed in the extensive envelopes surrounding these stars. The various objects of this sort could be generally grouped into the following classes: a) the Of stars; b) the Wolf-Rayet stars; c) the Be-stars; d) the Shell stars; e) the B-
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Reddening-Free Q Parameters to Classify B-Type Stars with Emission Lines

Galaxies, 2023
Yael Aidelman, Lydia Sonia Cidale
exaly  

Observations of Emission-Line Stars

Publications of the Astronomical Society of the Pacific, 1965
openaire   +1 more source

Optical spectroscopy of Be stars: Peak separation of Balmer emission lines

Astronomische Nachrichten, 2023
Kiril A Stoyanov, Radoslav K Zamanov, Michael F Bode   +2 more
exaly  

First high-resolution optical spectra of the distant emission-line star VES 723 (IRAS 02110+6212)

Monthly Notices of the Royal Astronomical Society, 2021
Anatoly Miroshnichenko, M V Yushkin, V E Panchuk   +2 more
exaly