# 14.3.5 vari_long_period_variable

This table describes the Long Period Variable stars.
Some entries can be NaN when absent.

Columns description:

solution_id : Solution Identifier (long)

All Gaia data processed by the Data Processing and Analysis Consortium comes tagged with a solution identifier. This is a numeric field attached to each table row that can be used to unequivocally identify the version of all the subsystems that where used in the generation of the data as well as the input data used. It is mainly for internal DPAC use but is included in the published data releases to enable end users to examine the provenance of processed data products. To decode a given solution ID visit https://gaia.esac.esa.int/decoder/solnDecoder.jsp

source_id : Unique source identifier (long)

A unique single numerical identifier of the source obtained from gaia_source (for a detailed description see gaia_source.source_id)

abs_mag_bol : Absolute bolometric magnitude of the star (double, Magnitude[mag] )

This parameter gives the absolute bolometric magnitude for the case of LPVs.

abs_mag_bol_error : Error of absolute bolometric magnitude (double, Magnitude[mag] )

This parameter gives the error of the absolute bolometric magnitude for the case of LPVs.

rsg_flag : Red supergiant flag (boolean, Dimensionless[see description])

This flag marks stars that are probably red supergiants.

bolometric_corr : Bolometric correction for LPVs (double, Magnitude[mag])

This parameter gives the bolometric correction for the case of LPVs; details of the calculation can be found in Chapter 7 of the release documentation. For DR2, the bolometric correction was fixed to a specific value in three cases. First for red supergiant LPVs, identified with rsg_flag=True, the value was set to $-0.71$ mag. Second, the value was set to $-2.2$ mag for LPVs with G amplitude variations $>$ 3 mag, where the variability amplitude is computed as the 5-95% trimmed range using the LEGACY strategy of commons-math to compute the percentiles. Third, for all cases for which the uncertainty in BP or in RP was larger than 4 mag, the BP-RP color was assumed to be 3.25 mag, at which value the bolometric correction is $-1.729$ mag.

bolometric_corr_error : Error of the bolometric correction (double, Magnitude[mag] )

This parameter gives the error of the bolometric correction for the case of LPVs. For DR2, the bolometric correction was fixed to a specific value in three cases. First for red supergiant LPVs, identified with rsg_flag=True, the value was set to 0.3 mag. Second, the value was set to 0.005 mag for LPVs with G amplitude variations $>$ 3 mag, where the variability amplitude is computed as the 5-95% trimmed range using the LEGACY strategy of commons-math to compute the percentiles. Third, for all cases for which the uncertainty in BP or in RP was larger than 4 mag, the BP-RP color was assumed to be 3.25 mag and the error on BP-RP assumed to be 2 mag, at which values the bolometric correction error is 1.892 mag.

frequency : Frequency of the LPV (double, Frequency[$day^{-1}$])

This field is the frequency found for the Long Period Variable star.

frequency_error : Error on the frequency (double, Frequency[$day^{-1}$])

This field gives the error on the frequency for the Long Period Variable star.