Skiff Spectral Catalog Search Output Columns

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.

Column Information

Target Name: Target name as specified in Skiff's catalog
Examples: 10 Lac, HD 141556
Spec Class: 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
Target RA: Right Ascension (J2000)
Range 0 to 360 deg
Target Dec: Declination (J2000)
Range: -90 to +90 deg
TT: 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 ?)
tt: 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 ?)
LL: Luminosity class specified as an integer from 10 to 35. See the Spectral Classification Tables.
Example: 0 and 10 to 35 (see table ?)
P1: First encoded global peculiarity. Also indicates composites stars (p1=1). See the Spectral Classification Tables.
Range: 0 to 9, 0 = unknown
P2: Second encoded global peculiarity (must have a different value from P1). See the Spectral Classification Tables.
Range: 0 to 9, 0 = unknown
P3: 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
P4: 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
unparsed text: Part of original spectral clasification ignored or unable to be parsed in the encoding process.
Mixed-case string
Pub. Year: Year of paper in which spectral classification was first published (from Skiff's catalog)
2001
Bibcode: Bibcode for latest publication found (from Skiff's catalog)
Magnitude: 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.
D Flag: 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
st_id: A sequential integer used internally as a unique ID.