Object X

CONFIRMED M33  

Equatorial coordinates
α =  23.350196 | 01 33 24.047000
δ =  30.426272 | +30 25 34.580000
 
Constellation Triangulum
Symbiotic IR Type  
Spectral Type yellow/red hypergiant + O-B
Magnitude range (V)  
Outbursts No

Identifiers

Object X GSC TYC WRAY
SIMBAD 2MASS J01332404+3025345 HIP SAO Hen
BD – IRAS  GAIA DR2  ESO
HD 2MASS J01332404+3025345 WISE J013324.03+302534.5 AAVSO

Position

Right ascension (°) 23.350196ref  Parallax (mas) Reddening E(B-V) (mag) 0.039 ± 0.001ref
Declination (°) 30.426272ref  Distance (kpc) 847.00 ± 60.00ref    
Galactic longitude (°) 133.551679ref  Proper motion in α (mas/yr)    
Galactic latitude (°) -31.578679ref  Proper motion in δ (mas/yr)    

Observations

U (mag) >24.1ref  X-Ray   Flickering  
B (mag) >24.2ref  X-Ray type   Outbursts No
V (mag) 23.15ref  IUE No Type  
R (mag) 21.61ref  IRAS flux at 12 μm (Jy)   IPmax (eV) 35.1ref
I (mag) 19.99ref  IRAS flux at 25 μm (Jy)   OVI lines Noref
G (mag)   IRAS flux at 60 μm (Jy)      
J (mag) 17.07ref IRAS flux at 100 μm (Jy)      
H (mag) 15.04ref WISE W1 (mag) 11.95ref    
K (mag) 13.60ref WISE W2 (mag) 10.80ref    
L (mag)   WISE W3 (mag) 7.91ref    
    WISE W4 (mag) 5.30ref    
    Radio      
    Radio flux (mJy)      

Orbit

Orbital period (days) >10957500ref γ velocity (km/h) -113ref 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 yellow/red hypergiantref Mass (M) >30ref  Pulsation  
Eff. temperature (K)   Radius (R)   Type  
IR type   Luminosity (L)   Pulsation period (days)  
Metallicity [Fe/H]       Ephemeris type  
        Ephemeris T(JD)  

Hot component

Type/Spectra O-Bref Mass (M) 20-30ref Spin period (min)  
Eff. temperature (K)   Radius (R)   Accretion disk  
Lower limit (K) 35000ref Luminosity (L) 80000-160000ref    
Upper limit (K) 45000ref        

Links

SIMBAD     CDS Portal


Notes

The most luminous infrared star in M33. The star is clearly composite, with a hot, luminous O-B star component and a cool, dust-enshrouded companion. Object X is a very young and massive binary star (Mikołajewska et al., 2015).


References

  • Khan, R., Stanek, K. Z., Kochanek, C. S., et al., 2011, ApJ, 732, 43, 2011ApJ…732…43K
  • Mikołajewska, J., Caldwell, N., Shara, M. M., et al., 2015, ApJ, 799, L16, 2015ApJ…799L..16M

Last updated: Jan 14, 2019 @ 9:21 am