Titre du document

The Frequency of Cepheid Binaries

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Nom du Corpus

AstroConcepts

Auteur(s)
  • T. Lloyd Evans
Résumé

New radial velocity observations are presented for 24 Cepheids previously observed by others. All the available data are discussed; of the 18 stars for which observations are adequate one, S Mus, is certainly a binary; AH Vel and possibly V Car may be binaries. V 636 Sco, found to have a variable ?-velocity by Feast, is a long period binary. Re-examination of the literature on Cepheid radial velocities has revealed one new spectroscopic binary, AW Per, which was previously known to have a composite spectrum. At least 15 per cent of Cepheids are in spectroscopic binary systems of long period. There appears to be a deficiency of Cepheids in binary systems with periods of about one year. The confirmed and suspected Cepheid binaries have systematically smaller light amplitudes than Cepheids in general. Photometric criteria for the detection of hot companions to Cepheids are discussed and a list of possible examples found from UBV photometry is given. One, KN Cen, is found spectroscopically to be composite. The nature of the companions are examined. If the unseen companion of S Sge is a main sequence star, the Cepheid probably pulsates in the first harmonic.

Langue(s) du document
Indéterminé
Année de publication
1968
Revue

Monthly Notices of the Royal Astronomical Society

Éditeur
OUP
Type de publication
journal
Type de document
research-article
Présence de XML structuré
Non
Version de PDF
1.4
Score de qualité du texte
4.305
Nom du concept
  • Blue stragglers
Catégories Science-Metrix
  • 1 - natural sciences ; 2 - physics & astronomy ; 3 - astronomy & astrophysics
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Space and Planetary Science
  • 1 - Physical Sciences ; 2 - Physics and Astronomy ; 3 - Astronomy and Astrophysics
Catégories WoS
  • 1 - science ; 2 - astronomy & astrophysics
Identifiant ISTEX
49388695A0784C3CDF818FAA7979E99B3BCEBA37
ark:/67375/HXZ-J731D4KS-0
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