h 与 χ Persei 星团的 UBVI 与 Hα 光度测量
摘要
presented for 17319 stars in vicinity of the young double cluster h & χ Persei. Our photometry extends over a 37arcmin x 1arcdeg field centered on the association. We construct reddening contours within the imaged field. We find that the two clusters share a common distance modulus of 11.75±0.05 and ages of log age(yr) = 7.1±0.1. From the V-Ha colour, a measure of the Ha emission strength, we conduct a survey for emission line objects within the association. We detect a sample of 33 Be stars, 8 of which are new detections. We present a scenario of evolutionary enhancement of the Be phenomenon to account for the peak in Be fraction towards the top of the main-sequence in the population of h & χ Persei and similar young clusters.
引用
@article{arxiv.astro-ph/0104179,
title = {UBVI and Ha Photometry of the h & chi Persei cluster},
author = {Stefan C. Keller and Eva K. Grebel and Grant Miller and Kenneth Yoss},
journal= {arXiv preprint arXiv:astro-ph/0104179},
year = {2009}
}
备注
20 pages, 9 figures, AJ July