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Glossary of VULCAN attributes
This Glossary alphabetically lists all attributes used in the VULCANv20260525 database(s) held in the ASNIR. If you would like to have more information about the schema tables please use the VULCANv20260525 Schema Browser (other Browser versions).

A

B

C

D

E

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G

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I

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N

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V
Name	Schema Table	Database	Description	Type	Length	Unit	Default Value	Unified Content Descriptor
var_flg	allwise_sc	WISE	Variability flag. The variability flag is a four-character string, one character per band, in which the value for each band is related to the probability that the source flux measured on the individual WISE exposures was not constant with time. The probability calculation uses the standard deviation of the single exposure flux measurements, w?sigp1, as well as the band-to-band flux correlation significance, q12,q23,q34. CAUTION: Estimation of flux variability is unreliable for sources that are extended (ext_flg>0), and sources whose measurements are contaminated by image artifacts in a band (cc_flags[b] != '0').	varchar	4
			The probability is computed for a band only when there are at least six single-exposure measurements available that satisfy minimum quality criteria. A value of "n" in a band indicates insufficient or inadequate data to make a determination of possible variability. Values of "0" through "9" indicate increasing probabilities of variation. Values of "0" through "5" are most likely not variables. Sources with values of "6" and "7" are likely flux variables, but are the most susceptible to false-positive variability. Var_flg values greater than "7" have the highest probability of being true flux variables in a band.
var_flg	wise_allskysc	WISE	Variability flag. The variability flag is a four-character string, one character per band, in which the value for each band is related to the probability that the source flux measured on the individual WISE exposures was not constant with time.	char	4		NONE
var_flg	wise_prelimsc	WISE	Variability flag The variability flag is a four-character string, one character per band, in which the value for each band is related to the probability that the source flux measured on the individual WISE exposures was not constant with time	char	4		NONE
vbroad	gaia_source	GAIADR3	Spectral line broadening parameter	real	4	km/s		spect.dopplerVeloc.opt;em.opt.I
vbroad_error	gaia_source	GAIADR3	Uncertainty on the spectral line broadening	real	4	km/s		stat.error;spect.dopplerVeloc.opt;em.opt.I
vbroad_nb_transits	gaia_source	GAIADR3	Number of transits used to compute vbroad	smallint	2			meta.number
vc	twomass_sixx2_xsc	TWOMASS	visual verification score for source	smallint	2
vc	twomass_xsc	TWOMASS	visual verification score for source.	smallint	2			meta.code
vegaToAB	Filter	VULCANiDR	The constant to convert Vega magnitudes to AB magnitudes.	real	4	mag	-0.9999995e9
visibility_periods_used	gaia_source	GAIADR3	Number of visibility periods uased in the astrometric solution	smallint	2			meta.number
vr_m_opt	twomass_psc	TWOMASS	Visual or red magnitude of the associated optical source.	real	4	mag		phot.flux