Computer Science – Sound
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996stin...9720765b&link_type=abstract
Conference Paper, Sounding Solar and Stellar Interiors
Computer Science
Sound
B Stars, Seismology, Stellar Evolution, Mathematical Models, Position (Location), Hydrogen, Luminosity, Opacity
Scientific paper
A major goal of asteroseismology is a better understanding of stellar evolution via ''snapshots'' of many stars of different masses in different evolutionary states. For stars of about 2M(circle dot) near the sequence, b Scuti stars are the usual suspects. There is an ongoing renaissance in theoretical modeling of 6 Scuti stars brought on by improvements in constitutive physics and by a dramatic increase in the number of modes observed. FG Virginis and CD-24' 7599 are two of the best studied objects, and they have 19 and 13 known frequencies, respectively. . We create models using an updated and modified version of the Iben code described by Guzik & Cox that includes either of the two versions of the OPAL opacities . We use the star's observed location on the H-R diagram as a starting point for our seismological modeling. Because there is no evidence for observed t = 3 modes, we only consider l = 0, 1, and 2 modes in our analysis. We take into account rotational splitting (about 5 - 10 (mu)Hz) in our frequency matching. Several observed modes must be rotationally split members of a given mode. CD-24' 7599 is less than halfway through core hydrogen burning, and the modes appear to be a set of consecutive 3rd through 5th overtones of (ital l) = 0 through 2 modes. With only 13 modes, we find satisfactory fits with models between 1.9 and 2.0 M(circle dot) that fall within the observed luminosity and effective temperature range. By contrast, Guzik & Bradley suggest that FG Virginis is over halfway through core hydrogen burning and the best fitting models lie near 1.80 or 2.00 M(circle dot). We see persistent discrepancies in some low frequency modes, which suggests we may need a small amount of core overshoot or a slight change in metallicity to duplicate FG Virginis.
Bradley Paul Andrew
Guzik Joyce Ann
No associations
LandOfFree
Seismological Modeling of the Delta Scuti Star: CD-24 7599 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 Seismological Modeling of the Delta Scuti Star: CD-24 7599, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Seismological Modeling of the Delta Scuti Star: CD-24 7599 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1130163