This dataset (v2.0) contains ultraviolet and optical photometric data from GALEX, UVOT, and Gaia, along with stellar parameters (T_{eff}, [Fe/H], log g) derived from spectroscopic surveys and Gaia XP spectra. It provides Gaia G_{BP}G_{RP} color excess measurements for 92,142,820 sources, as well as color excess measurements for 11,624,802 and 65,531 stars in GALEX/near-UV and far-UV bands, and 336,633, 137,739, and 253,271 stars in UVOT/uvw1, uvm2, and uvw2 bands. Additionally, it includes extensive R_V measurements for a large number of stars and constructs ultraviolet extinction maps with unprecedented coverage, offering critical insights into interstellar extinction laws and dust distribution.
v2.0 Update: This version corrects coordinate matching issues present in the stellar parameters, optical band information, and color excess from the previous release. A new column, "stellar parameter source flag" (par_flg), has been added to identify the origin of stellar parameters:
'XP': Stellar parameters from Zhang et al. (2023) based on Gaia BP/RP (XP) spectra
'L': Stellar parameters from LAMOST spectroscopy
'G': Stellar parameters from GALAH spectroscopy
'A': Stellar parameters from APOGEE spectroscopy
This dataset is applicable for multi-band interstellar extinction studies, 3D dust distribution modeling, and research on correlations between stellar parameters and extinction.