Absolute proper motion of the Galactic open cluster M 67

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Table 1:

Non-axisymmetric Galactic model (Pichardo et al. 2003, 2004).
Parameter	Value	References
Bar half-length	3.1-3.5 kpc	Gerhard (2002)
Bar axial ratios	10:3.8:2.6	Freudenreich (1998)
Bar scale lengths	1.7, 0.64, 0.44 kpc	Freudenreich (1998)
Bar angle (respect to the Sun)	$20^{\rm o}$	Gerhard (2002)
Bar mass	$10^{10}\ {M}_\odot$	Debattista et al. (2002)
Bar pattern speed ( $\Omega_{\rm B}$ )	30-60 km s^-1 kpc^-1	( $^\ast$ )
Spiral Arms locus	Bisymmetric (Logthm)	Churchwell et al. (2009)
Spiral Arms pitch angle	$15.5^{\rm o}$	Drimmel (2000)
Spiral Arms external limit	12 kpc	Drimmel (2000)
Spiral Arms: exp. with scale-length	2.5 kpc	Disk based
Spiral Arms force contrast	$\sim$ 10%	Patsis et al. (1991)
Spiral Arms pattern speed ( $\Omega_{\rm S}$ )	20 km s^-1 kpc^-1	Martos et al. (2004)

References. ( $^\ast$ ) Weiner & Sellwood (1999), Fux (1999), Ibata & Gilmore (1995), Englmaier & Gerhard (1999).

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