Statistics – Computation
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..624c&link_type=abstract
The Astrophysical Journal, vol. 430, no. 2, pt. 1, p. 624-629
Statistics
Computation
13
Abundance, Galactic Clusters, Stellar Evolution, Stellar Luminosity, Stellar Temperature, Variable Stars, Astronomical Models, Cosmology, Stellar Oscillations
Scientific paper
We show that the temperature scale of Butler, Dickens, & Epps (1978) for RR Lyrae pulsators appears tightly correlated with the two pulsational parameters, amplitude and period of the pulsation. Application of these 'pulsational' temperatures to the well-studied Galactic globular clusters M3 and M15 gives for these clusters a reddening E(B - V) = 0.01 and 0.08, respectively. Moreover, we show that pulsational parameters should give rather severe constraints on the visual magnitude of the pulsators. Calibration of a similar relation to pulsator magnitudes as given by Baade-Wesselink (BW) analyses supports this suggestion, though producing Mnu values in systematic disagreement with current evolutionary computations. We discuss the problem, showing that BW results can be reconciled with the current evolutionary scenario only assuming a value of the original He as low as Y = 0.19 plus a systematic error in the temperature scale. Conversely, one may save the evolutionary scenario with Y = 0.23 by assuming a systematic error in BW magnitudes.
Castellani Vittorio
de Santis Renato
No associations
LandOfFree
A pulsational approach to the luminosity of RR Lyrae variables 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 A pulsational approach to the luminosity of RR Lyrae variables, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A pulsational approach to the luminosity of RR Lyrae variables will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1494186