M81 HII 403

SUSPECTED M81  

Equatorial coordinates
α =  149.052100 | 09 56 12.500000
δ =  69.127800 | +69 07 40.000000
 
Constellation Ursa Major
Symbiotic IR Type D
Spectral Type  
Magnitude range (V)  
Outbursts  

Identifiers

M81 HII 403 GSC TYC WRAY
SIMBAD PSK 403 HIP SAO Hen
BD – IRAS  GAIA DR2  ESO
HD 2MASS  WISE  AAVSO

Position

Right ascension (°) 149.052100ref  Parallax (mas) Reddening E(B-V) (mag) 0.069 ± 0.000ref
Declination (°) 69.127800ref Distance (kpc) 3630.00 ± 120.00ref    
Galactic longitude (°) 141.979600ref Proper motion in α (mas/yr)    
Galactic latitude (°) 40.911700ref Proper motion in δ (mas/yr)    

Observations

U (mag)   X-Ray   Flickering  
B (mag)   X-Ray type   Outbursts No
V (mag)   IUE No Type  
R (mag)   IRAS flux at 12 μm (Jy)   IPmax (eV)  
I (mag)   IRAS flux at 25 μm (Jy)   OVI lines  
G (mag)   IRAS flux at 60 μm (Jy)      
J (mag)   IRAS flux at 100 μm (Jy)      
H (mag)   WISE W1 (mag)      
K (mag)   WISE W2 (mag)      
L (mag)   WISE W3 (mag)      
    WISE W4 (mag)      
    Radio      
    Radio flux (mJy)      

Orbit

Orbital period (days)   γ velocity (km/h)   Size of giant’s orbit (AU)  
Eccentricity   RV of giant (km/h)   Separation (AU)  
Inclination (°)   Inferior conj. of giant (JD)   Mass function  
Ephemeris type       Mass ratio  
Ephemeris T(JD)          

Cool component

Spectral type   Mass (M)   Pulsation  
Eff. temperature (K)   Radius (R)   Type  
IR type Dref Luminosity (L)   Pulsation period (days)  
Metallicity [Fe/H]       Ephemeris type  
        Ephemeris T(JD)  

Hot component

Type/Spectra   Mass (M)   Spin period (min)  
Eff. temperature (K)   Radius (R)   Accretion disk  
Lower limit (K)   Luminosity (L)      
Upper limit (K)          

Links

SIMBAD     CDS Portal


Notes

Suspected to be a symbiotic binary in Iłkiewicz & Mikołajewska (2017) based on the position of the star in the [O III] diagnostic diagrams. 


References

Last updated: Jan 12, 2019 @ 5:45 pm