Cross-matching of RAVEDR5 against UCAC5:
- RAVE fiber has a diameter of 6.7″. The fiber positioning uncertainty is 0.7″ (see DR1 paper). With this in mind the cross-matching radius was set to 4.05″ (6.7 / 2 + 0.7).
- Cross-matching was done using the J2000 coordinates from both catalogs.
- For every RAVE star all UCAC5 stars within the matching radius were collected.
- If there were multiple stars withing the radius the brightest one (in Gaia g-band magnitude) was chosen as the primary. The fluxes of the rest of the stars were added together. The ratio of their fluxes with respect to the primary’s flux was expressed as the contamination ratio (gmag_cont). For example, the value of 0.2 implies that the rest of the stars within the fiber radius contribute 20% of the flux in g-band.
- While g-band magnitude is available for all cross-matches, some of the stars also have measurements from other bands. r-band and j-band contamination ratios are also available (rmag_cont, jmag_cont). They are computed in the same was as the g-band contamination ratio except using the different bands. Please note that regardless of the band in which the contamination ratio is computed the brightest star (primary) is always defined as the one with the lowest g-band magnitude.
- Contamination ratios are set to NULL if there is only one UCAC5 star present in the cross-matching radius. If there are more stars, but magnitudes in r- or j-band are not available the contamination ratio is set to -1. This means there is some flux contribution from the surrounding stars but the value is unknown.
- The distance to the primary matching star is given in the Dist_UCAC5 column.
[tableinfo db=”RAVEPUB_DR5″ table=”RAVE_UCAC5″][identifier doi=”10.17876/rave/dr.5/029″]
[columninfo db=”RAVEPUB_DR5″ table=”RAVE_UCAC5″]