The excitation of solar-like oscillations in a delta Scuti star by efficient envelope convection

Details The excitation of solar-like oscillations in a delta Scuti star by efficient envelope convection The excitation of solar-like oscillations in a delta Scuti star by efficient envelope convection

2011-09-20

arxiv.org/abs/1109.4285v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

to appear as a Letter to Nature

Scientific paper

10.1038/nature10389

Delta Scuti (delta Sct) stars are opacity-driven pulsators with masses of 1.5-2.5M$_{\odot}$, their pulsations resulting from the varying ionization of helium. In less massive stars such as the Sun, convection transports mass and energy through the outer 30 per cent of the star and excites a rich spectrum of resonant acoustic modes. Based on the solar example, with no firm theoretical basis, models predict that the convective envelope in delta Sct stars extends only about 1 per cent of the radius, but with sufficient energy to excite solar-like oscillations. This was not observed before the Kepler mission, so the presence of a convective envelope in the models has been questioned. Here we report the detection of solar-like oscillations in the delta Sct star HD 187547, implying that surface convection operates efficiently in stars about twice as massive as the Sun, as the ad hoc models predicted.

Affiliated with

Also associated with

No associations

Rating

The excitation of solar-like oscillations in a delta Scuti star by efficient envelope convection 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 excitation of solar-like oscillations in a delta Scuti star by efficient envelope convection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The excitation of solar-like oscillations in a delta Scuti star by efficient envelope convection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-147121