Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-31
Astron.Astrophys. 414 (2004) 1081-1090
Astronomy and Astrophysics
Astrophysics
10 pages, 14 .eps figures, accepted in A&A
Scientific paper
10.1051/0004-6361:20034037
Phase differences and amplitude ratios at different colour photometric bands are currently being used to discriminate pulsation modes in order to facilitate mode identification of kappa-driven non-radial pulsating stars. In addition to physical inputs (e.g., mass, T_eff, etc.), these quantities depend on the non-adiabatic treatment of the atmosphere. This paper presents theoretical results concerning Delta Scuti pulsating stars. The envelope of each of these stellar structures possesses a convection zone whose development is determined by various factors. An interacting pulsation-atmosphere physical treatment is introduced which supplies two basic non-adiabatic physical quantities: the relative effective temperature variation and the phase lag phi^T, defined as the angle between effective temperature variations and radial displacement. These quantities can be used to derive the phase differences and amplitude ratios. Numerical values for these quantities depend critically on the alpha MLT parameter used to calculate the convection in the envelope. The dependence on alpha was analized and it was found that the use of colour observations may be of considerable importance in testing the MLT. Finally, examples are given of how alpha introduces uncertainties in the theoretical predictions regarding phases and amplitudes of photometric variations in Delta Scuti pulsating stars.
Dupret Marc-Antoine
Garrido Rafa
Moya Andres
No associations
LandOfFree
Non-adiabatic theoretical observables in Delta Scuti 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 Non-adiabatic theoretical observables in Delta Scuti stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-adiabatic theoretical observables in Delta Scuti stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-634941