This document defines the catalog entries describing
the SPEC_CLASS Data Archive.
Mark
Clicking on entries in this column will mark the entry for retrieval.
To mark all entries, click one of the buttons labelled
'Mark All','Mark public', or 'Mark Proprietary'.
(Unmarking all entries can be done the same way
using the appropriate button.)
For missions with proprietary data, the mark button element
will have a yellow background and a '@' symbol to indicate
data sets not yet public.
To Retrieve:
Click the button labelled 'Submit marked data for retrieval from
STDADS'. This will send all the marked data set names to the
data retrieval page. Follow the directions on the displayed pages.
To Coplot:
After selecting up to 15 observations to be plotted, click on
the "Plot marked spectra" button to coplot the selected observations.
The spectra that you selected will be automatically scaled
to the full range of wavelengths and nearly the full range of
fluxes (i.e., y axis plot scale runs from 0 (or .25 * the minimum flux
for spectra with negative fluxes) to the 10th highest flux). Each
spectrum is automatically assigned a color, up to a maximum of 15.
For plotting Kepler light curves, y-axis scaling is slightly different.
Plots scale simply from the minimum to the
maximum flux. It is also recommended that only Kepler light curves
from the same target be co-plotted due to the differences in flux values.
The spectra are labelled by their dataset names, with a
summary of the datasets plotted given below the plot. After inspecting
the plot, you may wish to change the selection of datasets which are
displayed. Use your browser "Back" button to do this.
Plot range Adjust the minimum and maximum wavelengths (in Angstroms)
and minimum and maximum fluxes (in erg /cm2/sec/A) to select the
spectral region of interest and to exclude noisy data.
Note Kepler light curves are in units of time and uncalibrated fluxes.
Plot dimensions Adjust the X size and Y size in pixels to create the size of plot
desired. The maximum dimensions are 850 by 640 pixels.
Redraw plot Use this button to replot the spectra when you have changed the plot range or plot dimensions.
Spectral classification as specified in Skiff's catalog. String is mixed case and matches must be exact. Only spectral types determined from spectra (viz.line and band strengths or ratios), omitting those determined from photometry (e.g. DDO, Vilnius) or inferred from broadband colors or spectral energy distributions. B0Vpe
Encoded spectral type TT specified as an integer (e.g., TT=12 for A stars). See the Spectral Classification Tables. Range: 0 and 10 to 56 (see table ?)
Encoded spectral subtype specified as an integer. See the Spectral Classification Tables. Range: 0 for unknown, 10 to 20 for normal stars, 10-12 for novae, and 10-16 for supernovae (see table ?)
third encoded peculiarity, specific to a particular type or group of spectral types. Note for composites, P3 and P4 specify the TT value of the secondary star (e.g., for an A secondary (TT=12), P3=1 and P4 = 2). See the Spectral Classification Tables. Range: 0 to 9, 0 = unknown
fourth encoded peculiarity, specific to a particular type or group of spectral types. Note for composites, P3 and P4 specify the TT value of the secondary star (e.g., for an A secondary (TT=12), P3=1 and P4 = 2). See the Spectral Classification Tables. Range: 0 to 9, 0 = unknown
Magnitude (from Skiff's catalog) Magnitudes were provided as an indication of brightness, but these data are not necessarily accurate, as they often derive from photographic photometry or rough estimates.
Flags special cases needing further explanation. d=0 normal, d=1 a classification in which a decimal subtype was truncated to an integer value, d=2 a ambiguous classification such as kA3, d=3 an unparsed classification