Analysis of the multiple system with chemically peculiar component phi Draconis

LIŠKA, Jiří. Analysis of the multiple system with chemically peculiar component phi Draconis. Monthly Notices of the Royal Astronomical Society. Priestley and Weale, 2016, vol. 461, No 1, p. 939-947. ISSN 0035-8711. Available from: https://dx.doi.org/10.1093/mnras/stw1355.

Basic information

• Original name: Analysis of the multiple system with chemically peculiar component phi Draconis
• Authors: LIŠKA, Jiří (203 Czech Republic, guarantor, belonging to the institution).
• Edition: Monthly Notices of the Royal Astronomical Society, Priestley and Weale, 2016, 0035-8711.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10308 Astronomy
• Country of publisher: United Kingdom of Great Britain and Northern Ireland
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 4.961
• RIV identification code: RIV/00216224:14310/16:00094209
• Organization unit: Faculty of Science
• Doi: http://dx.doi.org/10.1093/mnras/stw1355
• UT WoS: 000383272500070
• Keywords in English: binaries: spectroscopic; binaries: visual; stars: chemically peculiar; stars: individual: phi Dra; stars: variables: general
• Tags: AKR, rivok

Abstract

The star phi Dra comprises a spectroscopic binary and a third star that together form a visual triple system. It is one of the brightest chemically peculiar stars of the upper main sequence. Despite these facts, no comprehensive study of its multiplicity has been performed yet. In this work, we present a detailed analysis of the triple system based on available measurements. We use radial velocities taken from four sources in the literature in a re-analysis of the inner spectroscopic binary (Aab). An incorrect value of the orbital period of the inner system Aab about 27 d was accepted in literature more than 40 yr. A new solution of orbit with the 128-d period was determined. Relative position measurements of the outer visual binary system (AB) from Washington Double Star Catalog were compared with known orbital models. Furthermore, it was shown that astrometric motion in system AB is well described by the model of Andrade with a 308-yr orbital period. Parameters of A and B components were utilized to estimate individual brightness for all components and their masses from evolutionary tracks. Although we found several facts which support the gravitational bond between them, unbound solution cannot be fully excluded yet.

Links

• GA13-10589S, research and development project: Name: Ztráta hmoty horkých hmotných hvězd

Investor: Czech Science Foundation