Draco C-1

CONFIRMED Draco Dwarf  

Equatorial coordinates
α =  259.990238 ± 0.045145 | 17 19 57.657086
δ =  +57.834856 ± 0.046994 | +57 50 05.482634
 
Constellation Draco
Symbiotic IR Type S🡕
Spectral Type C1.2
Magnitude range (V) 17.0-17.4ref
Outbursts No

Identifiers

Draco C-1 GSC TYC WRAY
SIMBAD [ALS82] C1 HIP SAO Hen
BD – IRAS GAIA DR2 1433154243632773248 ESO
HD 2MASS J17195764+5750054 WISE  J171957.65+575005.5 AAVSO 000-BJT-701

Position

Right ascension (°) 259.990238 ± 0.045145ref  Parallax (mas) Reddening E(B-V) (mag) 0.023 ± 0.002ref
Declination (°) +57.834856 ± 0.046994ref Distance (kpc) 80 ± 10ref     
Galactic longitude (°) 86.272566 ± 0.046994ref Proper motion in α (mas/yr)    
Galactic latitude (°) +34.759213  ± 0.045145ref   Proper motion in δ (mas/yr)    

Observations

U (mag)   X-Ray Yesref Flickering  
B (mag) 18.43ref X-Ray type αref Outbursts No
V (mag) 17.00ref IUE Yes Type  
R (mag) 16.11ref IRAS flux at 12 μm (Jy)   IPmax (eV) 77.5
I (mag) 15.67ref IRAS flux at 25 μm (Jy)   OVI lines Noref
G (mag) 16.63ref IRAS flux at 60 μm (Jy)      
J (mag) 14.38ref IRAS flux at 100 μm (Jy)      
H (mag) 13.71ref WISE W1 (mag) 13.25ref    
K (mag) 13.46ref WISE W2 (mag) 13.26ref    
L (mag)   WISE W3 (mag) 12.69ref    
    WISE W4 (mag) 9.68ref    
    Radio 3.6 cmref    
    Radio flux (mJy) <0.1ref    

Orbit

Orbital period (days) 1220 (+3.7, -3.5)ref γ velocity (km/h) -298.991 (+0.025, -0.026)ref Size of giant’s orbit (AU)  
Eccentricity 0.1906 (+0.0076, -0.0078)ref RV of giant (km/h) 5.2244 (+0.045, -0.041)ref Separation (AU) 2.227 (+0.071, -0.069)ref
Inclination (°)   Inferior conj. of giant (JD)   Mass function  
Ephemeris type       Mass ratio 0.344ref
Ephemeris T(JD)          

Cool component

Spectral type C1.2ref Mass (M) 0.735 (+0.093, -0.091)ref Pulsation  
Eff. temperature (K) 3934 (+75, -71)ref Radius (R) 101.6 (+4.7, -5.4)ref Type  
IR type S🡕, ref Luminosity (L) 2130 (+160, -400)ref Pulsation period (days)  
Metallicity [Fe/H] -1.34 (+0.18, -0.20)ref     Ephemeris type  
        Ephemeris T(JD)  

Hot component

Type/Spectra WDref Mass (M) 0.56 ± 0.6ref
>0.253 (+0.012, -0.011)ref
Spin period (min)  
Eff. temperature (K) 180000 ± 30000ref Radius (R) 0.21-0.30ref
0.17 ± 0.06ref
Accretion disk  
Lower limit (K)   Luminosity (L) 7500-31000ref    
Upper limit (K)          

Links

SIMBAD     CDS Portal     VSX


Notes

Draco C-1 was discovered by Aarson et al. (1992) in search of carbon stars. They noted that the Zantra temperature of the photoionization source is extremely high. According to Munari (1991), observed spectral characteristics match well with the case of a white dwarf accreting at low rates from the carbon star companion. The spectrum shows many emission lines. Analysis of X-ray, ultraviolet (UV), and optical data taken with XMM-Newton was presented in Saeedi et al. (2018). Lewis et al. (2020) presented the precise orbital parameters based on the high-resolution spectroscopic observations.


References

Last updated: Sep 19, 2020 @ 10:22 am