目录
图像
上传图像
DSS Images Other Images
相关文章
Eight new δ Scuti stars
HD 23194, a member of the Pleiades, was found to pulsate with a periodof about 30min. The literature on the star is reviewed, and it isconcluded that it may be a marginal Am star in a binary system. HD 95321is an evolved Am (ρ Puppis) star with a 5.1-h periodicity. Modeidentification of its pulsation, based on multicolour photometry,suggests that the oscillation is probably non-radial with l=2. We alsoreport on the discovery of six other new δ Scuti stars, some ofwhich may be pulsating in gravity modes.
| Southern metal-poor stars - UBVRI photometry
Considering the study of subdwarf kinematics and metallicities by Eggen,Lynden-Bell, and Sandage (1962), UBVRI photometry and normalizedultraviolet excesses are presented for 178 metal-poor stars, 144 ofwhich are contained in the kinematically unbiased list of Bidelman andMacConnell (1973). The Lowell 0.6 m telescope at Cerro Tololo was used,equipped with a single-channel photometer and a Ga-As photomultiplier.The final magnitudes and colors, number of observations, value ofdelta(U-B)0.6 (if B-V lies between 0.35 and 0.90), B and M class, andpublished spectral types for these stars are presented; severalextremely metal-poor stars are evident. In addition, sixteen nearbyvisual companions of the stars were measured, and their magnitudes andcolors are given.
|
提交文章
相关链接
提交链接
下列团体成员
|
观测天体数据
目录:
|
