Open AccessThe Line Variability of 78 Vir (A2p SrCrEu) in the Far-ultraviolet
Author(s) -
Richard Monier
Publication year - 2022
Publication title -
research notes of the aas
Language(s) - English
Resource type - Journals
ISSN - 2515-5172
DOI - 10.3847/2515-5172/ac5b7b
Subject(s) - far ultraviolet , ultraviolet , excitation , line (geometry) , spectral line , chromium , astrophysics , physics , emission spectrum , atomic physics , analytical chemistry (journal) , materials science , chemistry , optics , astronomy , metallurgy , geometry , mathematics , chromatography , quantum mechanics
Line variations are studied in the far-ultraviolet spectra of 78 Vir collected with International Ultraviolet Explorer at phases of far-UV maximum and at phases of far-UV minimum . The far-UV spectrum of 78 Vir is populated with low-excitation transitions of light elements and iron-peak elements. The low excitation C i and N i lines are stronger at phases of far-UV minimum . Carbon appears to be underabundant and aluminum very underabundant in the atmosphere of 78 Vir. The lines of Si i and Si ii are stronger at phases of far-UV minimum . Many lines which strengthen at phases of far-UV minimum are due to low-excitation lines of Fe ii and Cr ii which suggests that both iron and chromium are unevenly distributed over the surface of 78 Vir.