碳富Mira变量：运动学与绝对光度
摘要
The kinematics of galactic C-Miras are discussed on the basis of the bolometric magnitudes and radial velocities of Papers I and II of this series. Differential galactic rotation is used to derive a zero-point for the bolometric period-luminosity relation which is in satisfactory agreement with that inferred from the LMC C-Miras. We find for the galactic Miras, Mbol = -2.54logP + 2.06 (+/- 0.24), where the slope is taken from the LMC. The mean velocity dispersion, together with the data of Nordstroem et al. and the Padova models, leads to a mean age for our sample of C-Miras of 1.8 +/- 0.4 Gyr and a mean initial mass of 1.8 +/-0.2 solar masses. Evidence for a variation of velocity dispersion with period is found, indicating a dependence of period on age and initial mass, the longer period stars being younger. We discuss the relation between the O- and C-Miras and also their relative numbers in different systems.
引用
@article{arxiv.astro-ph/0603506,
title = {Carbon-Rich Mira Variables: Kinematics and Absolute Magnitudes},
author = {Michael W. Feast and Patricia A. Whitelock and John W. Menzies},
journal= {arXiv preprint arXiv:astro-ph/0603506},
year = {2009}
}
备注
8 pages, 2 figures, accepted for publication in MNRAS