Orbital and Physical Properties of the σ Ori Aa, Ab, B Triple System

We provide a complete characterization of the astrophysical properties of the σ Ori Aa, Ab, B hierarchical triple system and an improved set of orbital parameters for the highly eccentric σ Ori Aa, Ab spectroscopic binary. We compiled a spectroscopic data set comprising 90 high-resolution spectra covering a total time span of 1963 days. We applied the Lehman-Filhés method for a detailed orbital analysis of the radial velocity curves and performed a combined quantitative spectroscopic analysis of the σ Ori Aa, Ab, B system by means of the stellar atmosphere code FASTWIND. We used our own plus other available information on photometry and distance to the system for measuring the radii, luminosities, and spectroscopic masses of the three components. We also inferred evolutionary masses and stellar ages using the Bayesian code BONNSAI. The orbital analysis of the new radial velocity curves led to a very accurate orbital solution of the σ Ori Aa, Ab pair. We provided indirect arguments indicating that σ Ori B is a fast-rotating early B dwarf. The FASTWIND+BONNSAI analysis showed that the Aa, Ab pair contains the hottest and most massive components of the triple system while σ Ori B is a bit cooler and less massive. The derived stellar ages of the inner pair are intriguingly younger than the one widely accepted for the σ Orionis cluster, at 3 ± 1 Ma. The outcome of this study will be of key importance for a precise determination of the distance to the σ Orionis cluster, the interpretation of the strong X-ray emission detected for σ Ori Aa, Ab, B, and the investigation of the formation and evolution of multiple massive stellar systems and substellar objects.

Illyricvm

Ioan. Sambucus Ortelio suo, S Mitto hanc quòque tabellam qua nesessaria confinia Pannoniæ declarantur, fluviorum et aliquot locorum situs Hirschvogelii recte mutaui, Angelini autem studio plurima adieci, et inualla correxi, vt parum quis si cum Hirschvogelig hæc conjugat desiderarit si qui errores sint, dies certiora docebit.

Toldi szerelme : zenedráma három felvonásban = Toldi's Liebe : Musikdrama in drei Aufzügen /

German translation by Ludwig von Dóczi.

Pusztaszer, a honalapító magyar nemzet elsö törvényhozási közgyülése színhelyének története.

Bibliographical footnotes.

Geschichte von Östreich,

The "Register" has special t.p. and separate paging.

Gedrangte geschichte des östreichischen kaiserstaates bis auf die neueste zeit,

Mode of access: Internet.

Devocion de San Joseph : primera y segunda parte /

Mode of access: Internet.

Devocion de S. Joseph : Primera, y segunda parte /

Mode of access: Internet.

Delitiae poetarum hungaricorum /

Ioannis Filiczku ... Poemata varia, en p. 465, con portadilla propia.

Aspirationes theologicae : in quinquaginta duas anni SS. Trinitatis, intellectu ac voluntate colendae, hebdomadas distributae /

Mode of access: Internet.

Révaí nagy lexikona; ez ismeretek enciklopédiája.

Mode of access: Internet.

Geschichte der Magyaren,

1. Bd. Von der ältesten Zeit bis zum Erlöschen der Arpáden. Das Kolonisationssystem der magyarischen Könige bis zum Entstehen der königlichen Freistädte unter Sigmund 1405. Ungerns Handel und Industrie im Mittelalter. Regententafel. Erläuterungen des arpádischen Mannsstammes.--2. Bd. Die Anjou's. Von Sigmund bis zur Schlacht von Mohács. Dalmatiens Verhältniss zu Ungern. Bruchstücke aus der magyarischen Rechtsgeschichte. Krönung Ladislas V.--3. Bd. Von Ferdinand I. bis zur pragmatischen Sanktion und dem Erlöschen des habsburgischen Mannsstammes, 1526-1740. Magyarische Geschichtschreiber.

Venetian drawings, 1600-1800; [exhibition] Mills College Art Gallery, Oakland [and] California Palace of the Legion of Honor, San Francisco.

"Drawings from the collection of Janos Scholz."

Tunisias, ein Heldengedicht in zwölf Gesängen.

Mode of access: Internet.

Legenden der Heiligen auf alle Sonn- und Festtage des Jahres : in metrischer Form /

Includes bibliographical references.