Results 21 to 30 of about 199,190 (345)
Gamma Cas Stars as Be+White Dwarf Binary Systems
The Astrophysical Journal Letters, 2022 The origin of the bright and hard X-ray emission flux among the γ Cas subgroup of B-emission line (Be) stars may be caused by gas accretion onto an orbiting white dwarf (WD) companion.
Douglas R. Gies +2 more
doaj +1 more source
Emission Lines in Star Forming Galaxies [PDF]
Symposium - International Astronomical Union, 1995 Magris et al. (1993, Proceedings of the ESO/OHP Workshop on Dwarf Galaxies, ed. G. Meylan) have combined the spectral evolution population synthesis code of Bruzual & Charlot (1993, ApJ 405, 538) with the multipurpose photoionization-shock code MAPPINGS (Binette et al.
Gustavo A. Bruzual, Gladis C. Magris
openaire +1 more source
Emission activity of the Be star 60 Cygni [PDF]
Serbian Astronomical Journal, 2017 In this paper we present results of spectroscopic analysis of the H® line profile of the Be star 60 Cygni. We present time evolution of the equivalent width of the H® line profiles during years 1992 - 2016 and V=R variation during years 1995 ...
Šejnová K., Votruba V.
doaj +1 more source
Reddening-Free Q Parameters to Classify B-Type Stars with Emission Lines
Galaxies, 2023 The emission-line B-type stars constitute a heterogeneous group. Many of these stars show similar optical spectroscopic features and color indices, making it difficult to classify them adequately by means of photometric and spectroscopic techniques. Thus,
Yael Aidelman, Lydia Sonia Cidale
doaj +1 more source
Mass Outflow and Chromospheric Activity of Red Giant Stars in Globular Clusters II. M13 and M92 [PDF]
, 2009 High resolution spectra of 123 red giant stars in the globular cluster M13 and 64 red giant stars in M92 were obtained with Hectochelle at the MMT telescope.
A. K. Dupree +32 more
core +1 more source
Survey of X-Rays from Massive Stars Observed at High Spectral Resolution with Chandra
The Astrophysical Journal, 2023 Identifying trends between observational data and the range of physical parameters of massive stars is a critical step to the still-elusive full understanding of the source, structure, and evolution of X-ray emission from the stellar winds, requiring a ...
Pragati Pradhan +4 more
doaj +1 more source
Constraints to the magnetospheric properties of T Tauri stars. I. The C II], Fe II] and Si II] ultraviolet features [PDF]
, 2014 The C II] feature at ~2325 Angstrom is very prominent in the spectra of T Tauri stars (TTSs). This feature is a quintuplet of semiforbidden transitions excited at electron temperatures around 10,000 K that, together with the nearby Si II] and Fe II ...
de Castro, Ana Ines Gomez +1 more
core +3 more sources
A photometric catalogue of southern emission-line stars [PDF]
Astronomy & Astrophysics, 2001 42 pages, no figures, to appear in Astronomy & ...
de Winter, D. +7 more
openaire +2 more sources
The nature of LINER galaxies: Ubiquitous hot old stars and rare accreting black holes [PDF]
, 2013 Galaxies, which often contain ionised gas, sometimes also exhibit a so-called low-ionisation nuclear emission line region (LINER). For 30 years this was attributed to a central mass-accreting supermassive black hole (AGN) of low luminosity, making LINER ...
Alves, J. +21 more
core +2 more sources
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.
openaire +2 more sources