• Aucun résultat trouvé

The UV spectrum of the Be star HD 50138.

N/A
N/A
Info
Télécharger
Protected

Academic year: 2021

Partager "The UV spectrum of the Be star HD 50138."

Copied!
1
0
0

Chargement.... (Voir le texte intégral maintenant)

Texte intégral

(1)

Be Star Newsletter, Number 8, September 1983

-2-COHTRIBUnOHS

•

•••

THE UV SPECTRUM OF THE Be STAR HD 50138

D. HUTSEMEKERS Institut d'Astrophysique

Liège - Belgique

-=-ABSTRACT

The lUE satellite was used to record the high resolution ultraviolet

o

spectrum (H -v 1250 - 3180 A )of the Be star HD 50138.The most prominent spectral features of this object belong ta various ionisation stages and show very ttifferent line profiles. Tbc:Iaedue ta the SiIV resonance lines are wide and asymmetrical, giving evidelJce of en expansion of the atmosphere in which they are fQrmed (Vedge '" 600 km/s). The Mg II resonance Unes show a longward emissioa protïle quite unusual for a Be star, which could be caused by a fluores-cence mechanism driven by Ly 8.

The lines due to Fe II show a complete shell spectrum (about 300 lines are identified), indicating a small but definite expansion. ln the long wavelength range, aclear emission is seen for the most intense Fe

n

multiplets and is pro-bably related to the decrease of the continuum.

Références

Télécharger maintenant ( PDF - 1 Page - 382.87 KB )

Documents relatifs

Rotations d'un condensat de Bose-Einstein

Dans ce dernier cas, l’´etat du condensat n’est pas un ´etat de vorticit´e uniforme — son moment cin´etique est partag´e entre le mode quadrupolaire et le r´eseau de

Modélisation du niveau instantané de la mer en conditions paroxysmales : Caractérisation des contributions à différentes échelles de temps et d’espace

Figure A.13 – Trajectoire du typhon BOLAVEN au cours du temps et comparaison du niveau observé à Jiangjun, du niveau prédit par le CWB avec celui modélisé par la

Notations. Let H be a Hilbert space. We denote by sp(T ) the spectrum of T and by sp

Université Denis Diderot 2012-2013.. Mathématiques M1

More light on the 2ν5 Raman overtone of SF6: Can a weak anisotropic spectrum be due to a strong transition anisotropy?

To showcase the procedure that we followed to reveal any pressure broadening or narrowing effects on the anisotropic spectrum, the spectrum is shown (symbols) for a

What could a Boolean category be?

In a more specific mean- ing a Boolean category should provide the abstract algebraic structure underlying the proofs in Boolean Logic, in the same sense as a Carte- sian

Book Experimental Mathematics In Action pdf - Web Education

The goal of this course is to present a coherent variety of acces- sible examples of modern mathematics where intelligent com- puting plays a significant role and in doing so

Could Representative Democracy Be Reformed? A Citizens’ perspective

That is why as a second step, we propose to dig deeper into this question of the compatibility of representative democracy with the alternatives of

The ultraviolet spectrum of the Be star HD 50138

[r]