Observational Study of Supernova Rates in Early-type Galaxies

该项目的目的是通过使用日本一些公共天文台的中等尺寸（60厘米-105厘米）望远镜监测星系，得出附近早期星系的超新星率。主要观测于1997年1月在7个观测站的合作下开始，并将继续几年，有更多的参与者。早型星系中的超新星在星系本身及其热星际气体的化学和动力学演化中起着重要的作用。每台望远镜配有r波段滤光片和冷态CCD相机，可观测多个场。选择的磁场包括附近星系团的密集核心。每个田在最近一次观测后两周内进行观测。平场和探测新的（或更亮的）物体是自动化的。为了通知监控状态，组织了一个WWW页面（http: // WWW）。netwave。或。jp / -yfujita /雪。html，用日语写的)。这对于用其他观测站弥补某些领域的观测不足是非常有用的。虽然到目前为止我们还没有发现任何超新星，但这个项目仍将与更多的天文台合作继续进行。

The aim of this project is to derive the supernova rates in nearby early type galaxies by monitoring galaxies with medium size (60cm--105cm) telescopes that belong to some public astoronomical observatories in Japan. Main observations started in January 1997 with the cooperation of seven observatiories, and will continue for some years with more participants.Supernovae in early type galaxies play an important role in the chemical and dynamical evolution of the galaxies themselves and their hot interstellar gas.Each telescope with the R-band filter and chilled CCD camera observes several fields. The fields are selected to include the dense cores of nearby clusters of galaxies. Each fields are observed within two weeks after the latest observation. The flatfielding and the detection of new (or brighter) objects are automated. To inform the monitoring status, a WWW page is organaized (http : //www. netwave. or. jp/-yfujita/snow. html, written in Japanese). This is found to be quite useful to compensate the lack of observation for some fields with other observatories. Though we have not detected any supernovae so far, this project will still continue with cooperation with more observatories.