The ^12C(alpha,gamma)^16O Nuclear Reaction Rate from Asteroseismology of the DBV White Dwarf CBS 114
| dc.creator | Metcalfe, T. S. | |
| dc.creator | Handler, G. | |
| dc.date | 2002-08-12 | |
| dc.date.accessioned | 2026-07-07T02:04:39Z | |
| dc.date.available | 2026-07-07T02:04:39Z | |
| dc.description | We have identified seven independent pulsation modes in the helium-atmosphere variable (DBV) white dwarf star CBS 114, based on 65 hours of time-resolved CCD photometry from the 0.75-m telescope at SAAO. We interpret these pulsations as non-radial g-modes with the same spherical degree l=1, as suggested by the mean period spacing of 37.1+/-0.7 seconds. We use a genetic-algorithm-based fitting method to find the globally optimal model parameters, including the stellar mass (M_* = 0.73 M_sun), the effective temperature (T_eff = 21,000 K), the mass of the atmospheric helium layer (log[M_He/M_*] = -6.66), and the central oxygen mass fraction (X_O = 0.61). The latter value implies a rate for the ^12C(alpha,gamma)^16O reaction near S_300 = 180 keV b, consistent with laboratory measurements. | |
| dc.description | 4 pages, 1 figure, to appear in proceedings of ``Asteroseismology Across the HR Diagram'' | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0208225 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0208225 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/4839 | |
| dc.subject | Astrophysics | |
| dc.title | The ^12C(alpha,gamma)^16O Nuclear Reaction Rate from Asteroseismology of the DBV White Dwarf CBS 114 | |
| dc.type | text |