The pulsation mode of the cluster Cepheid V1726 Cygni

Citation
Dg. Turner et al., The pulsation mode of the cluster Cepheid V1726 Cygni, PUB AST S P, 113(784), 2001, pp. 715-722
Citations number
42
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
ISSN journal
0004-6280 → ACNP
Volume
113
Issue
784
Year of publication
2001
Pages
715 - 722
Database
ISI
SICI code
0004-6280(200106)113:784<715:TPMOTC>2.0.ZU;2-6
Abstract
CCD V-band observations and archival O-C estimates are presented for the 4. 237 day Cepheid V1726 Cyg, which is a member of the open cluster C2128+488 (Anon. Platais), and the data are analyzed in conjunction with other availa ble photometric data in order to study the star's period variations. An O-C analysis of the data yields of following improved ephemeris for the variab le, HJD(max) = 2,444,020.5892 + 4.2369334E + 2.044 x 10(-8)E(2), which impl ies that the period of V1726 Cyg is increasing at a rate of +0.304 +/- 0.02 6 s yr(-1), consistent with a star in the third crossing of the instability strip provided that it is pulsating in the first-overtone, rather than fun damental, mode. Overtone pulsation for V1726 Cyg is also indicated by its l ow amplitude, sinusoidal light curve, and derived Fourier parameters, despi te reservations about the significance of the latter. No evidence is found for random cycle-to-cycle variations in period for V1726 Cyg.