The theory of white dwarfs

Saakyan, G. S.; Sedrakyan, D. M.; Chubaryan, Eh. V.

doi:10.1007/bf01041736

Cited by 2 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Let us first discuss the numerical data in Table 1. The first five columns list the central density c ρ and the following integral parameters: mass M in units of the solar mass, equatorial radius R e = a and moment of inertia I 3 with respect to the axis of rotation of the configuration rotating with angular velocity (listed in column 5) max Ω [9]. Given next are the heights H of mountains on the surface of white dwarfs, the ellipticity ε, gravitational radiation intensity J 0 the amplitude h 0 of the gravitational wave for an observer on the earth, and the damping time 0 τ for the white dwarf owing to gravitational radiation.…”

Section: Estimations Of Scales Of "Mountains" On the Surface Of A Whimentioning

confidence: 99%

Gravitational radiation from white dwarfs with rough surfaces

Sedrakian¹,

Hayrapetyan²,

Sadoyan³

2005

Astrophysics

View full text Add to dashboard Cite

A white dwarf rotating at a maximal angular velocity can take a form of a triaxial ellipsoid due to the rotation and to the presence of mountains on its surface. Such an object emits gravitational waves at a frequency of 2Ω, where Ω is the angular velocity of rotation, and the source of the radiated energy is the rotational kinetic energy. It is shown that the gravitational waves from rapidly rotating white dwarfs at an average distance of 50 pc from an terrestrial observer have an amplitude on the order of 10 -24 , so they can be detected by the new generation of detectors. Gravitational radiation from a pulsating white dwarf with a rough surface is also examined. It is shown that quasiradial pulsations of a white dwarf are long-lived; that is, once perturbed, a white dwarf will emit gravitational waves during all lifetime.

show abstract

Section: Estimations Of Scales Of "Mountains" On the Surface Of A Whimentioning

confidence: 99%

Gravitational radiation from white dwarfs with rough surfaces

Sedrakian¹,

Hayrapetyan²,

Sadoyan³

2005

Astrophysics

View full text Add to dashboard Cite

show abstract

“…5, we assume that the ratio A/Z is variable, where A is the mass number and Z is the atomic number of a nucleus.…”

Section: Introductionmentioning

confidence: 99%

“…Original article submitted November 22, 2005 This ratio equals 2 at the surface and increases toward the star's center [5]. To study the differential rotation we assume that the angular velocity of the star has the form ( ) ⊥ Ω = Ω r , where ⊥ r is the cylindrical radius.…”

Section: Introductionmentioning

confidence: 99%

Gravitational radiation from differentially rotating and oscillating white dwarfs

Sedrakian¹,

Shahabasyan²,

Shahabasyan³

2006

Astrophysics

View full text Add to dashboard Cite

We examine the possible emission of gravitational waves from white dwarfs undergoing self-similar oscillations driven by the energy released during relaxation of their differential rotation. Two distributions of the initial angular momentum are considered. It is assumed that 1% of the energy dissipated by a rotating white dwarf is converted into the energy of self-similar oscillations and, therefore, into gravitational radiation. The relative amplitude of the gravitational radiation from an isolated white dwarf at a distance of 50 pc is found to be less than 10 -27 . The emission from the galactic population of white dwarfs may create a background which overlaps the random cosmological background of gravitational radiation for the improved decihertz detectors currently being proposed.

show abstract

The theory of white dwarfs

Cited by 2 publications

References 1 publication

Gravitational radiation from white dwarfs with rough surfaces

Gravitational radiation from white dwarfs with rough surfaces

Gravitational radiation from differentially rotating and oscillating white dwarfs

Contact Info

Product

Resources

About