Titre du document

## Results of a Search for Bright ? Cephei Variables in the Southern Sky

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Nom du Corpus

#### AstroConcepts

Auteur(s)
• B. E. J. Pagel
Résumé

The radial velocities of seven bright southern early B-type stars, known to have variable velocity, have been systematically examined at the Radcliffe Observatory in an effort to detect the presence of short periods (3 to 7 hours) characteristic of ? Cephei variables. Positive results were obtained for three stars: ? Cru $(0\lt2K\lt14\,\text{km/sec})$, ?1 Lup (2K=11 km/sec), and ? Lup (2K=15 km/sec). Definitive periods have been derived for ?1 Lup and ? Lup, while a provisional period is suggested for ? Cru. ? Cru and ?1 Lup have been observed photoelectrically by the staff of the Cape Observatory and found to have short-period variations in light with a range of about 0m.04. In the case of ?1 Lup, the light variation shows the same period as the velocity variation, with the phase relationship typical of ? Cephei variables. In the case of ? Cru, all that can be said is that the light variation has approximately the period of the velocity variation. ? Lup was observed photoelectrically by A. B. Muller at the Leiden Observatory Southern Station; no variation in excess of 0m.01 has so far been detected. ?1 Lup fits closely the period–luminosity relations derived for ? Cephei variables by Blaauw and Savedoff and by Petrie. It is clearly a typical member of the group with constant velocity amplitude. ? Lup comes tolerably near to the period-luminosity relation, but, until some variation in light can be established, one cannot quite exclude the possibility that it is a single-lined spectroscopic binary. ? Cru, in spite of its early spectral type (B0), would seem to be related to the ? Cephei group, though it is anomalous in a number of ways.

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Année de publication
1956
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
5.001
Nom du concept
• Beta Cephei stars
Catégories Science-Metrix
• 1 - natural sciences ; 2 - physics & astronomy ; 3 - astronomy & astrophysics
Catégories Inist
• 1 - sciences appliquees, technologies et medecines ; 2 - sciences biologiques et medicales ; 3 - sciences medicales ; 4 - maladies metaboliques
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
60CEA7EB9D100DA7DC610F4547BCBB8DC8AE12EA