Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...199..191p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 199, no. 1-2, June 1988, p. 191-200.
Astronomy and Astrophysics
Astrophysics
27
Cepheid Variables, Light Curve, Peculiar Stars, Stellar Envelopes, Blue Stars, Fourier Analysis, Giant Stars, Helium, Power Spectra
Scientific paper
Results obtained on V1719 Cyg defined to be equal to HD 200925 (period 0.267 d), V798 Cyg (0.196 d), and V974 Oph (0.191 d) are presented here. These three Delta Sct-type variables show an asymmetric light curve with a descending branch steeper than the ascending one, a feature that has, so far, never been found in any such variable. A double-mode pulsation with f(1)f(2) = 0.800 is definitely established for V1719 Cyg. New measures secured on V798 Cyg suggest a possible second period with an uncertain value between f(2) = 7.41 c/d and its aliases. The light curve of V974 Oph also shows cycle-to-cycle variations that can be accounted for by a second period. The physical characteristics of these variables, in particlar those of V1719 Cyg, are discussed, and it is suggested that the phenomena observed may be accounted for by helium settling within the stellar envelope.
Antonello Elio
Poretti Ennio
No associations
LandOfFree
The peculiar light curves of some large amplitude Delta SCT stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The peculiar light curves of some large amplitude Delta SCT stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The peculiar light curves of some large amplitude Delta SCT stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1176540