ar X iv : a st ro - p h / 99 05 15 0 v 1 1 2 M ay 1 99 9 When SN explode in a starburst : trasitions among AGN types

ar X iv : a st ro - p h / 99 05 13 6 v 1 1 2 M ay 1 99 9 Dating Starburst and Post - Starburst Galaxies

Stellar population models to predict the H Balmer and HeI lines in absorption are presented. Models are computed for burst and continuous star formation. It is found that the Balmer and HeI line profiles are sensitive to the age, except during the first 4 Myr of the evolution, when the equivalent widths of these lines are constant. The comparison of these lines with the corresponding nebular em...

ar X iv : a st ro - p h / 99 05 37 6 v 1 2 8 M ay 1 99 9 A 6 . 4 - hr positive superhump period in TV

ar X iv : a st ro - p h / 99 05 07 9 v 2 7 M ay 1 99 9 Introduction to Principal Components Analysis 1 Paul

Understanding the inverse equivalent width – luminosity relationship (Baldwin Effect), the topic of this meeting, requires extracting information on continuum and emission line parameters from samples of AGN. We wish to discover whether, and how, different subsets of measured parameters may correlate with each other. This general problem is the domain of Principal Components Analysis (PCA). We ...

ar X iv : a st ro - p h / 95 05 14 5 v 1 3 1 M ay 1 99 5 Search for GRB counterparts

ar X iv : a st ro - p h / 99 05 07 9 v 1 6 M ay 1 99 9 Introduction to Principal Components Analysis 1 Paul

Understanding the inverse equivalent width – luminosity relationship (Baldwin Effect), the topic of this meeting, requires extracting information on continuum and emission line parameters from samples of AGN. We wish to discover whether, and how, different subsets of measured parameters may correlate with each other. This general problem is the domain of Principal Components Analysis (PCA). We ...