Titre du document

Combined Light and Velocity Measurements of the Variable Star 12 Lacertae

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Nom du Corpus

AstroConcepts

Auteur(s)
  • A. ABRAMI 1
  • G. BAKOS 2
  • P. BROGLIA 3
  • B. CESTER 1
  • J. F. HEARD 2
  • M. HACK 3
  • M. HURUHATA 4
  • C. DE JAGER 5
  • J. KUBIKOVSKI 6
  • J. J. KUMSISVIII 7
  • R. LYNDS 8
  • N. L. MAGALASHVILI 7
  • S. V. NEKRASSOVA 9
  • G. J. ODGERS 10
  • J. J. RUIZ 11
  • J. SAHADE 12
  • H. J. SMITH 13
  • M. J. SMYTH 14
  • N. THOMAS 8
  • M. WALKER 15
Affiliation(s)
  • Trieste, Italy.
  • Richmond Hill, Canada.
  • Merate, Italy.
  • Tokyo, Japan.
  • Utrecht, Netherlands.
  • Bialkov, Poland.
  • Abastumani, U.S.S.R.
  • Berkeley, U.S.A.
  • Simeis, U.S.S.R.
  • Victoria, Canada.
  • Dannemora, U.S.A.
  • Mt. Wilson, U.S.A.
  • New Haven, U.S.A.
  • Dunsink, Ireland.
  • Palomar, U.S.A.
Résumé

DURING the summer and autumn of 1956, fifteen observatories co-operated in securing brightness and radial velocity measurements of the variable star 12 Lacertae. The variable belongs to the group of Beta Canis Majoris stars, consisting of about a dozen known members, which vary in light and radial velocity. Stars of this group have spectral types B2, B3, and luminosity classification IIIV, and their periods range between 0.15d. and 0.25d. The amplitudes of the light curves are small, of the order of some tenths of a magnitude. The light and radial-velocity curves are often not quite regular, showing that they are the result of several components. Thus the star 12 (DD) Lacertae has a principal period of 4h. 38m. and a secondary period of 4h. 44m., while recently a third component of 3h. 45m. has been found, and a fourth one of 3.9h. has been suggested. The periods occur in the variation of both the light and the radial velocity. The presence of components with closely similar periods and amplitudes of the same order produces the beat phenomenon, characteristic of a number of stars of the Beta Canis Majoris group. The occurrence of this relatively large number of components produces the observed complexity of the light and velocity curves.

Langue(s) du document
Indéterminé
Année de publication
1957
Revue

Nature

Éditeur
Nature
Type de publication
journal
Type de document
other
Présence de XML structuré
Oui
Version de PDF
1.3
Score de qualité du texte
4.505
Nom du concept
  • Beta Canis Majoris stars
Catégories Science-Metrix
  • 1 - general ; 2 - general science & technology ; 3 - general science & technology
Catégories Inist
  • 1 - sciences appliquees, technologies et medecines ; 2 - sciences biologiques et medicales ; 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - General ; 2 - Multidisciplinary ; 3 - Multidisciplinary
Catégories WoS
  • 1 - science ; 2 - multidisciplinary sciences
Identifiant ISTEX
B9E99468CE991D9A81DC9B0EFE66D7E95F70C8AC
ark:/67375/GT4-S2V255MH-M
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