Watching ZZ Ceti evolve
نویسندگان
چکیده
منابع مشابه
Gravity Modes in Zz Ceti Stars. Ii. Eigenvalues and Eigenfunctions
We report on numerical calculations of nonadiabatic eigenvalues and eigenfunctions for g-modes in ZZ Ceti variables. The spectrum of overstable l \ 1 modes delineates the instability strip. Its blue edge occurs where for the n \ 1 mode. Here u is radian frequency and is about 4 times the uq c B 1 q c thermal time at the bottom of the surface convection zone. As a ZZ Ceti cools, its convection z...
متن کاملGravity-modes in Zz Ceti Stars Iii. Eigenvalues and Eigenfuctions
We report on numerical calculations of nonadiabatic eigenvalues and eigenfunctions for g-modes in ZZ Ceti variables. The spectrum of overstable l = 1 modes delineates the instability strip. Its blue edge occurs where ωτc ≈ 1 for the n = 1 mode. Here ω is radian frequency and τc is about four times the thermal timescale at the bottom of the surface convection zone. As a ZZ Ceti cools, its convec...
متن کاملBPM 24754 : A new Southern ZZ Ceti star ?
We report the discovery of a new long–period ZZ Ceti star through the analysis of photometric time series gathered on 7 nights between 1995 and 1996. The light curve displays a periodic variation with a period of ∼ 18 min in white light and the frequency analysis reveals a low frequency peak at ∼ 0.92 mHz with an amplitude varying from 0.007 to 0.025 mag present every night. BPM 24754 is the 28...
متن کاملPG 1541 + 650 : A new ZZ Ceti white dwarf ?
We report the discovery of a new pulsating DA white dwarf, or ZZ Ceti, from the list of the Palomar-Green survey, rediscovered in the ongoing Hamburg Quasar survey (HQS). PG1541+650 is one of the ZZ Ceti candidates listed in the analysis of 80 DA white dwarfs from the HQS. With an effective temperature of 12000 K, for a surface gravity logg=7.79, it lies in the ZZ Ceti instability strip. It is ...
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This paper introduces an innovative visualisation technique for exposing the software defects that develop as a software project evolves. The application of this technique to a large-scale industrial software project is described together with the way in which the technique was modified to enable integration with the software configuration management process. The paper shows how a number of for...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2009
ISSN: 1742-6596
DOI: 10.1088/1742-6596/172/1/012074