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SPEC_CLASS Field Descriptions

You may submit queries using any of the fields listed below. The "Column label" is the name displayed on the search forms and in search results. The "Column name" is the actual column name in the table and needs to be specified in GET requests. (See the MAST Services web page for information on submitting GET requests.) If the "Column name" is in italics, it means the table is indexed on that field and queries with that field will run faster. Clicking on "Data Type" entries will display information on search options.

When using the "user-specified field" form element on a MAST search form, simply select the column "label" in the forms pulldown menu and type in the qualification in the adjacent box. If you specify constraints on the same column in more than one form element, they will all be included in the query and you may not get results you expect. Note the entries in the table below may be sorted by clicking on the column headings.

spec_class table containing Skiff's spectral classifications and our proposed numerical equivalent.
Last Update: January 23, 2013

Column Name Column Label Description Examples/Valid Values Data Type
Column Name Column Label Description Examples/Valid Values Data Type
st_target Target Name Target name from Skiff table. When a common name is not known, the convention was to use the authors initials followed by the year of publication all in brackets, followed by a number as assigned in the publication (e.g., [BE74] 185 ). Examples: 10 Lac, HD 141556 estring
st_string Classification String Spectral classification as specified in Skiff's catalog. String is mixed case but case does not matter in search. Spaces do exist though, so wildcards may be needed in queries. Only spectral types determined from spectra (viz.line and band strengths or ratios) are included, omitting those determined from photometry (e.g. DDO, Vilnius) or inferred from broadband colors or spectral energy distributions. B0Vpe, A3Va-, C5 pec, F0V + G6 estring
st_ra Target RA Right Ascension (J2000) Range 0 to 360 deg ra
st_dec Target Dec Declination (J2000) Range: -90 to +90 deg dec
st_type 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 ?) integer
st_subt 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 ?) integer
st_lum LL Luminosity class specified as an integer from 10 to 35. See the Spectral Classification Tables. Example: 0 and 10 to 35 (see table ?) integer
st_p1 P1 First encoded global peculiarity. Also indicates composites stars (p1=1). See the Spectral Classification Tables. Range: 0 to 9, 0 = unknown integer
st_p2 P2 Second encoded global peculiarity (must have a different value from P1). See the Spectral Classification Tables. Range: 0 to 9, 0 = unknown integer
st_p3 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 integer
st_p4 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 integer
st_rest unparsed text Part of original spectral clasification ignored or unable to be parsed in the encoding process. Mixed-case string estring
st_date Pub. Year Year of paper in which spectral classification was first published (from Skiff's catalog) 2001 integer
st_bibcode Bibcode Bibcode for latest publication found (from Skiff's catalog) bibstring
st_mag 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. float
st_cflag 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 integer
st_id st_id A sequential integer used internally as a unique ID. integer

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