The Delta Scuti Star Rho Puppis: the Perfect Target to Probe the Theory Predicting Solar-like Oscillations in Cool Delta Scuti Stars

AbstractThe direct fit of theoretical pulsation frequencies to the observations (i.e. stellar seismology) proved to be a very efficient tool in the study of solar oscillations. In the case of other multiperiodic variables, like δ Scuti stars, Ap stars and white dwarfs the method suffers from the disturbing abundance of possible nonradial modes. Colour and/or radial velocity (or line profile) measurements can narrow down the number of possibilities, but these kinds of data are not often available with the desired accuracy and sampling rate. Since pulsational frequencies are the most readily and accurately computed and measured quantities of pulsation, we address the question of the accurate fit of the nonradial pulsation frequencies to the observations in the case of δ Scuti stars.

Download Full-text

Frequency Oscillations in the Delta Scuti Star V534 Tauri: Preliminary Results of the STEPHI IX Campaign

International Astronomical Union Colloquium ◽

10.1017/s0252921100058516 ◽

2000 ◽

Vol 176 ◽

pp. 477-478

Author(s):

L. Fox Machado ◽

Z. P. Li ◽

E. Michel ◽

M. Alvarez ◽

M. M. Hernández ◽

...

Keyword(s):

Main Sequence ◽

Class Iii ◽

Significant Progress ◽

Instability Strip ◽

Preliminary Results ◽

Scuti Star ◽

Delta Scuti Star ◽

Delta Scuti ◽

Scuti Stars ◽

Made In

The δ Scuti stars are pulsating variables located in the lower part of the Cepheid instability strip with spectral types from A2 to F0 on the main sequence, and from A3 to F5 at luminosity class III. These variables show short periods (< 0.3day) and luminosity amplitudes ranging from a few thousandths of a magnitude to several tenths. Over the last few years, significant progress has been made in the detection of pulsating modes in the framework of the multisite campaigns, e.g. STACC (Frandsen et al. 1996), DSN (Breger et al. 1998), STEPHI (Michel et al. 2000). For the 1998 STEPHI IX photometry campaign, the δ Scuti star V534 Tau of the Pleiades cluster (see Table 1) was monitored during a three week, three continent run. Preliminary results are reported here.

Download Full-text

First light curve analysis of the high-amplitude Delta Scuti star GSC 4552–1498

New Astronomy ◽

10.1016/j.newast.2017.01.009 ◽

2017 ◽

Vol 54 ◽

pp. 86-90

Author(s):

S.J. Jafarzadeh ◽

A. Poro

Keyword(s):

Light Curve ◽

High Amplitude ◽

Curve Analysis ◽

Light Curve Analysis ◽

Scuti Star ◽

Delta Scuti Star ◽

Delta Scuti

Download Full-text

The unusual Delta Scuti star θ2 Tau

Stellar Pulsation - Lecture Notes in Physics ◽

10.1007/3-540-17668-3_186 ◽

2008 ◽

pp. 122-125

Author(s):

Michel Breger ◽

E. Antonello ◽

L. Mantegazza ◽

Huang Lin ◽

Jiang Shi-yang ◽

...

Keyword(s):

Scuti Star ◽

Delta Scuti Star ◽

Delta Scuti

Download Full-text

The Delta Scuti Star GX Pegasi: A Theoretical Investigation of its Power Spectrum

International Astronomical Union Colloquium ◽

10.1017/s0252921100014147 ◽

1993 ◽

Vol 134 ◽

pp. 181-183

Author(s):

E. Michel ◽

M. J. Goupil ◽

Y. Lebreton ◽

A. Baglin

Keyword(s):

Power Spectrum ◽

Theoretical Investigation ◽

Main Sequence ◽

Main Sequence Star ◽

Mode Identification ◽

Star Models ◽

Convective Core ◽

Scuti Star ◽

Delta Scuti Star ◽

Delta Scuti

Target of a STEPHI multisite campaign, the Delta Scuti star GX Pegasi has been found to oscillate with at least five simultaneous, close frequencies (table I).Mode identification together with informations about the star that such an identification can provide are outlined below (see also Michel et al, 1992b).The mode identification is carried out by means of a comparison between the observed frequencies and the adiabatic frequencies of models appropriate to this star. Models that match GX Peg’s position in a Hertzsprung-Russell diagram have masses in the range 1.9 – M⊙. When included, convective core overshoot is handled as in Maeder and Meynet (1989). According to these models, GX Peg is a rather evolved, main sequence star.

Download Full-text