peculiar stars

peculiar stars

Stars with spectral features that do not correspond exactly with the usual classification of spectral types. In general they are designated by a ‘p’ after their spectral type, as with Ap stars, but specific features are given other suffixes, e.g. ‘e’ for emission or ‘m’ for metallic lines.
References in periodicals archive ?
Your pages repeatedly assert that astronomers have "deduced" what goes on inside peculiar stars, black holes, Martian history, and so on, whereas in fact they have come up with explanations that are consistent with most of the observed facts and appear superior to competing explanations.
Another looked at the spectrophotometry of Chemical Peculiar stars to determine the effective temperatures and surface gravities [18].
My interests include the relationships among the normal and non-magnetic Chemically Peculiar stars. Since 1984, I have been a Guest Investigator at the Dominion Astrophysical Observatory (Victoria, BC, Canada).
My students have also participated in comparing results of similar spectral type stars or of normal and peculiar stars with similar effective temperatures (e.g., normal A and metallic lined A stars [29]).
Equally important are the newly found binary CSPN with intermediate periods, which appear linked to chemically peculiar stars whose composition was modified by binary evolution.
Chemically peculiar stars of the upper main sequence
Dr Dworetsky went on to outline the four main types of chemically peculiar star. These are: Am stars, which show strong heavy metal lines, no magnetic field, and and are slow rotators; Ap stars, which show lines of strontium, chromium and rare earth elements, a strong magnetic field, and generally slow rotation; mercury-manganese stars, which show abundance of singly ionised Hg and Mn, but weak magnetic fields and very slow rotation rates; and finally, helium-weak stars, which have weaker helium lines than would be expected from their colour.
Sanduleak of Case Western Reserve University in Cleveland has been cataloguing certain kinds of peculiar stars for a long time.
In the end Przybylski's rare-earth star failed to overturn stellar-evolution theory and instead became the coolest member of a set of many chemically peculiar stars with quiet atmospheres that suffer from heavy-ion levitation.