Open AccessMode identification of three low‐amplitude classical Cepheids: V1334 Cyg, V440 Per and V636 Cas
Author(s) -
Kovtyukh V. V.,
Luck R. E.,
Chekhonadskikh F. A.,
Belik S. I.
Publication year - 2012
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2012.21763.x
Subject(s) - physics , cepheid variable , amplitude , instability strip , astrophysics , overtone , mode (computer interface) , astronomy , stars , spectral line , optics , computer science , operating system
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 M v –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.