Bol D30

SUSPECTED M31  

Equatorial coordinates
α =  10.422818 ± 0.231300| 00 41 41.476227
δ =  41.052261 ± 0.225000 | +41 03 08.137931
 
Constellation Andromeda
Symbiotic IR Type  
Spectral Type FI
Magnitude range (V)  
Outbursts No

Identifiers

Bol D30 GSC TYC WRAY
SIMBAD Bol D30 HIP SAO Hen
BD – IRAS  GAIA DR2 381164917157806208 ESO
HD 2MASS  WISE  AAVSO

Position

Right ascension (°) 10.422818 ± 0.231300ref   Parallax (mas) Reddening E(B-V) (mag) 0.225 ± 0.025ref
Declination (°) 41.052261 ± 0.225000ref Distance (kpc) 785.00 ± 25.00ref    
Galactic longitude (°) 120.953328 ± 0.225000ref Proper motion in α (mas/yr) -0.681 ± 0.499ref    
Galactic latitude (°) -21.782042 ± 0.231300ref Proper motion in δ (mas/yr) -1.322 ± 0.502ref    

Observations

U (mag) 19.43ref X-Ray   Flickering  
B (mag) 19.35ref X-Ray type   Outbursts No
V (mag) 19.02ref IUE No Type  
R (mag) 18.80ref IRAS flux at 12 μm (Jy)   IPmax (eV)  
I (mag) 18.53ref IRAS flux at 25 μm (Jy)   OVI lines  
G (mag) 18.93ref IRAS flux at 60 μm (Jy)      
J (mag)   IRAS flux at 100 μm (Jy)      
H (mag)   WISE W1 (mag) 14.46ref    
K (mag) 16.02ref WISE W2 (mag) 13.16ref    
L (mag)   WISE W3 (mag) 10.15ref    
    WISE W4 (mag) 7.44ref    
    Radio      
    Radio flux (mJy)      

Orbit

Orbital period (days)   γ velocity (km/h)   Size of giant’s orbit (AU)  
Eccentricity   RV of giant (km/h) -780 ± 20ref Separation (AU)  
Inclination (°)   Inferior conj. of giant (JD)   Mass function  
Ephemeris type       Mass ratio  
Ephemeris T(JD)          

Cool component

Spectral type FIref Mass (M)   Pulsation  
Eff. temperature (K) 6500ref Radius (R)   Type  
IR type   Luminosity (L) 15000ref 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

The star has an extremely negative velocity and is probably located in the Giant Stream in M31. Caldwell et al. (2010) speculated that the object could be a symbiotic nova.


References

Last updated: May 11, 2019 @ 2:41 pm