Open AccessThe Line Variability of 78 Vir (A2p SrCrEu) in the Mid-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/ac5333
Subject(s) - ultraviolet , chromium , line (geometry) , manganese , spectral line , calcium , phase (matter) , nickel , chemistry , ultraviolet radiation , astrophysics , analytical chemistry (journal) , physics , environmental chemistry , optics , astronomy , radiochemistry , geometry , mathematics , organic chemistry
Line variations are studied in the mid-ultraviolet spectra of 78 Vir collected with IUE between phases of far-UV (FUV) maximum and FUV minimum. The mid-UV spectrum of 78 Vir is populated with low-lying transitions of iron-peak elements. The lines of Cr ii and Ca ii are found to be stronger at phase of FUV minimum, while the lines of Ni ii probably vary in anti phase with those of chromium and calcium. Those of Fe ii and Mn ii do not show convincing variations between the two phases. The analysis of these mid-ultraviolet spectra suggests that iron and manganese are uniformly distributed over the surface of 78 Vir, while chromium, calcium and nickel are not but more ultraviolet lines should be studied to confirm this.