Detecting variability in massive astronomical time series data - I. Application of an infinite Gaussian mixture model : Shin et al., 2009, MNRAS, 400, 1897
Detecting variability in massive astronomical time series data - II. Variable Candidates in the Northern Sky Variability Survey : Shin et al., 2012, AJ, 143, 65
2. Finding variable candidates in the NSVS field 016a with other constraints of positions.
In this example, we search variable candidate in the field 016a with some search coordinate and radius.
(Step 1) Find the clustering results of the field 016a in the "Field information" page. In the field 016a, the D_M 99% cut is 5.200767. The largest cluster's id is 5.
(Step 2) Use "General search for interactive usage" with your coordinate and search radius as well as the minimum D_M 5.200767. Save the results into a file by clicking the option box.
(Step 3) Use awk or other tools to extract rows of the NSVS objects which do not have the cluster id 5.
3. Finding variable candidates in the NSVS field by using Aladin.
The simple cone search service provided for the NSVS analysis can be accessed by using Aladin.
(Step 1) Open/run Aladin window.
(Step 2) Type coordinates or use your data to extract coordinates information.
(Step 3) Choose "File > Load from the Virtual Observatory".
(Step 4) Make sure that you select "Catalogs", and then type a search radius. In the current configuration, the maximum search radius is 3 arcmin in our simple cone search.
As explained in the method 1, use the D_M and clustering results of the fields to examine strengths of variability for the objects retrieved by Aladin.
4. Finding variable candidates in the NSVS field by using Topcat.
You can also access the NSVS's simple cone search with RA/DEC and a search radius by using Topcat.
(Step 1) Run Topcat.
(Step 2) Open VO -> Cone Search window.
(Step 3) Choose Euro-VO as a registry. Search stardb as a keyword.
(Step 4) Select StarDB's NSVS CS, and then type RA/DEC as well as a search radius. When you click the OK button, the search result will be returned as a table which can be used for plots.