Interpreting Your Search Results
After a few minutes of searching, the tool should return a table of data. For
example, if you selected "Try It!" for the Hipparcos survey, the table should look
like this:
Question
12. Use the "Try It!" tool for each of the four Cone resources
listed in the registry search results. Not all the columns are clearly labeled;
there are blank columns in both the Bright Star Catalogue and the Gliese
Catalogue of Nearby Stars. The first line of the tables should read:
Bright Star Catalogue
| ID_Main |
Star Name |
Alternate Star Name |
RA |
Dec |
V Magnitude |
Dwarf? |
Spectral Type |
Search offset |
Gliese Catalogue of Nearby Stars
| ID_Main |
Star Name |
RA |
Dec |
V Magnitude |
Spectral Type |
Parallax (mas) |
Absolute magnitude |
Search offset |
Which catalog looks like it has parallaxes for the largest number of
stars?
|
As you saw in the last question, the Gliese Catalogue of Nearby Stars is
a good place to get data for an H-R diagram, since it has parallaxes for
many stars.
You're almost ready to make an H-R diagram. But remember, you need also
need b-v color to make the diagram! (You could potentially use spectral type,
as you did in the diagram for the nearest stars, but you'd have to figure out
the numerical spectral type - by hand - for thousands of stars.) None of these
catalogs has b-v color available, so you'll have to look somewhere else.
Click Next to learn what to do.
|
