CM-Draconis

Type: Eclisping (non-contact) Binary

 RA: 16 34 24.54 Dec: +57 08 58.5 (J2000)

 A CCD-image of CM-Dra and comparison stars used in differential photometry.

CM Dra Orbital Elements
(References: L77 = Lacy, 1977; M96 = Metcalfe et al.,1996; CB95 = Chabrier & Baraffe 1995): 


Period(days): 
        1.26838965  (L77)
       +-.00000010 
             
        1.2683909   (M96)
       +-.0000024 
             
        1.268389934  (preliminary redetermination by the TEP 
       +-.000000005  group based on eclipse timings in 1994-96 
                     and using the Epochs given by L77) 
             
Epoch (Helioc. JD)
        primary min: 2442893.93249  (L77)
                          +-.00010
                     2449830.757029 (TEP, prelim. value)
        second. min: 2442894.56567  (L77)     
                          +-.00010
                
Orbital inclin. (L77)   89.82+- 0.05 deg 
Excentricity (M96)      0.0050+-0+.0015 
omega(M96)              142+-17 deg
Barycenter radial velocity (M96)
                        -118.71+-0.08 km s-1
Distance (CB95)         14.49 pc

                        CM Dra A                CM Dra B
                        large                   small  component
                
Semi Major Axis (M96)
 a sin i (10^6 km)      1.2584+-0.0025          1.40+-0.05
Mass  M sin i (Msol)
        M96             0.2306+-0.0010          0.2135+-0.0010  
        L77             0.238+-0.012            0.208+-0.009
Relat. Luminosity (L77) 53.4+-0.2%              46.6+-0.2%                        
Radii/separation (L77)  0.0669+-0.0005          0.0624+-0.0005                    
Radii(R sol, CB95)      0.252+-0.008            0.235+-0.007
Teff(CB95)              3150+-100               3150+-100
Mbol(CB95, at 14.49pc)  10.39                   10.54
Mv(CB95, at 14.49pc)    12.77                   12.92
Spectral Type           M4.5                    M4.5

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Last update: 25/Mar/2002. For comments, send email to Hans-Jörg Deeg at hXdeeg@ll.iaXc.es (NOTE: remove the X from adress)