Journal Article

Mode identification of three low-amplitude classical Cepheids: V1334 Cyg, V440 Per and V636 Cas

V. V. Kovtyukh, R. E. Luck, F. A. Chekhonadskikh and S. I. Belik

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 426, issue 1, pages 398-401
Published in print October 2012 | ISSN: 0035-8711
Published online October 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21763.x
Mode identification of three low-amplitude classical Cepheids: V1334 Cyg, V440 Per and V636 Cas

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Abstract

To identify the pulsation mode of three low-amplitude classical Cepheids, namely V1334 Cyg, V440 Per and V636 Cas, we use absolute magnitudes which are based upon Mv–Fe ii/Fe i line depth relations. We determine that V1334 Cyg is pulsating in the first overtone, and that V440 Per and V636 Cas are fundamental mode pulsators. Their low amplitudes are due to their position close to the edge of the instability strip.

Keywords: supergiants; stars: variables: Cepheids

Journal Article.  2147 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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