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Code Book
juansebastianl edited this page Apr 18, 2018
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Below is a list of the stellar parameters provided by astroML when loading the SEGUE dataset
| Parameter | meaning |
|---|---|
| ra | Right ascension of fiber, J2000 (https://en.wikipedia.org/wiki/Right_ascension) |
| dec | Declination of fiber, J2000 (https://en.wikipedia.org/wiki/Declination) |
| Ar | |
| upsf | The magnitude of the U-band photo input, characterized by light centered 365 nm, with a width of 66 nm.(see https://astronomy.stackexchange.com/questions/18986/what-is-the-ugriz-magnitude-system and https://en.wikipedia.org/wiki/Photometric_system) It is not clear is SDSS uses ugirz or u'g'i'r'z' (see: http://www.phys.lsu.edu/~jclem/publications/phd.pdf) |
| uErr | The uncertiny in upfs |
| gpsf | The magnitude of the G-band photo input, characterized by light centered 464 nm, with a width of 128 nm. (see upfs) |
| gErr | The uncertiny in gpfs |
| rpsf | The magnitude of the R-band photo input, characterized by light centered 658 nm, with a width of 138 nm. (see upfs) |
| rErr | The uncertiny in rpfs |
| ipsf | The magnitude of the I-band photo input, characterized by light centered 806 nm, with a width of 149 nm. (see upfs) |
| iErr | The uncertiny in ipfs |
| zpsf | The magnitude of the Z-band photo input, characterized by light centered 900 nm, with a width of ?? nm. (see upfs) |
| zErr | The uncertiny in zpfs |
| pmL | |
| pmB | |
| pmErr | |
| mjd | MJD (Modified Julien Date) of observation. Used along with plate & fiber to form the unique triple (plate , mjd , fiber) |
| plate | Plate number of observation. Used along with MJD & fiber to form the unique triple (plate , mjd , fiber) |
| fiber | Fiber number of observation. Used along with plate & MJD to form the unique triple (plate , mjd , fiber) |
| SNR | |
| FeH | [Fe/H] ratio, [Fe/H] = log((Fe/H)/(Fe/H)_sun) (see: http://icc.dur.ac.uk/~tt/Lectures/Galaxies/TeX/lec/node27.html) |
| FeHErr | Uncertainty in [Fe/H] |
| Teff | Effective temperature, a temperature estimate which oomes from luminosity L and black body radiation, given by L = (4πR^2)σT^4_eff, where σ is the Stefan-Boltzman constant. (see https://www.astro.princeton.edu/~gk/A403/constants.pdf) |
| TeffErr | Uncertainty in T_eff |
| logg | Log of surface gravitational constant g. |
| loggErr | Uncertainty in g |
| alphFe | [\alpha/Fe] ratio, or the log of the ratio of Ne, Mg, Si, S, Ar, Ca or Ti to Fe relative to the sun. (see https://physics.stackexchange.com/questions/205873/what-is-the-definition-of-alpha-rm-h and https://en.wikipedia.org/wiki/Alpha_process) |
| alphFeErr | Uncertainty in alphaFe |
| radVel | Radial Velocity |
| radVelErr | Uncertainty in radial velocity |