SLIDE 11 Tomaž Zwitter: RAVE, Padova workshop, 11/6/2009 Tomaž Zwitter: RAVE, Padova workshop, 11/6/2009 11 11
Check with repeated observations Check ck with re repeated obs
rvations
19 May 2009 internal data release: 19 May 2009 internal data release:
∆
∆ RV = 1.8 km/s RV = 1.8 km/s
276024 spectra, 276024 spectra,
∆
∆ Teff = 135 K Teff = 135 K
241376 objects observed once, 241376 objects observed once,
∆
∆ log g = 0.2 dex, log g = 0.2 dex,
15730 more than once 15730 more than once
∆
∆ [M/H] = 0.1 dex [M/H] = 0.1 dex These errors on stellar parameters are These errors on stellar parameters are less than half less than half of what is
derived from comparison with external datasets. So external datasets derived from comparison with external datasets. So external datasets values may not be error free and RAVE errors are indeed smaller. values may not be error free and RAVE errors are indeed smaller. If If ∆ ∆ RV > 5 km/s this is likely due to binarity (single lined spectroscopic RV > 5 km/s this is likely due to binarity (single lined spectroscopic binary). This happens in 6% of the cases. In binary). This happens in 6% of the cases. In ~0.6 ~0.6% binarity in a form % binarity in a form
- f a double lined spectroscopic binary detected from a single spectrum.
- f a double lined spectroscopic binary detected from a single spectrum.
