CXO J004318.8+412016
LIKELY
M31
Constellation
Andromeda |
Equatorial coordinates
α = 00 43 18.883
δ = +41 20 17.020 |
Galactic coordinates
l = 121.2931°
b = -21.5078° |
| Suspected |
2014Ref |
| Confirmed |
- |
| Symbiotic IR type |
- |
| Hot component type |
shell-burning?Ref |
| Outbursts |
- |
|
|
Identifiers
| CXO J004318.8+412016 |
IRAS - |
GSC2.4.2 NBVE320376 |
AAVSO - |
| SIMBAD RX J004318.6+412024 |
Pan-STARRS - |
SAO - |
VSX - |
| GAIA DR3 - |
SkyMapper - |
WRAY - |
GCVS - |
| 2MASS - |
HIP - |
Hen - |
BD - |
| WISE - |
TYC - |
ESO - |
HD - |
Symbiotic Catalogs
| Bidelman (1954) |
- |
Allen (1984) |
- |
Belzcyński et al. (2001) |
- |
| Gaposchkin (1957) |
- |
Kenyon (1986) |
- |
Akras et al. (2019) |
- |
| Boyarchuk (1969) |
- |
Vaidis (1988, 1991) |
- |
Position
| Right ascension (°) |
10.8287Ref |
Parallax (mas) |
- |
Reddening E(B-V) (mag) |
0.4±0.07Ref, Note |
| Declination (°) |
41.3381Ref |
Distance (kpc) |
785±25Ref
-, Note |
|
|
| Galactic longitude (°) |
121.2931Ref |
Proper motion in α (mas/yr) |
- |
|
|
| Galactic latitude (°) |
-21.5078Ref |
Proper motion in δ (mas/yr) |
- |
|
|
Observations
| X-Ray |
YesRef |
IR type |
- |
Radio |
- |
| X-Ray type |
αRef |
J (mag) |
- |
Flickering |
- |
| GALEX FUV (mag) |
- |
H (mag) |
- |
Outbursts |
- |
| GALEX NUV (mag) |
- |
K (mag) |
- |
Outburst type |
- |
| IUE |
NoRef |
WISE W1 (mag) |
- |
Jets |
- |
| FUSE |
NoRef |
WISE W2 (mag) |
- |
Resolved nebula |
- |
| U (mag) |
21.69Ref |
WISE W3 (mag) |
- |
IPmax (eV) |
54.4Ref |
| B (mag) |
23.13Ref |
WISE W4 (mag) |
- |
[O III] lines |
YesRef |
| V (mag) |
22.43Ref |
IRAS 12μm (Jy) |
- |
He II lines |
YesRef |
| R (mag) |
21.94Ref |
IRAS 25μm (Jy) |
- |
[Fe VII] lines |
NoRef |
| I (mag) |
21.00Ref |
IRAS 60μm (Jy) |
- |
O VI lines |
NoRef |
| BP (mag) |
- |
IRAS 100μm (Jy) |
- |
|
|
| G (mag) |
- |
AKARI S09 (Jy) |
- |
|
|
| RP (mag) |
- |
AKARI S18 (Jy) |
- |
|
|
Orbit
| Orbital period (days) |
230Ref |
γ velocity (km/h) |
- |
Size of giant’s orbit (AU) |
- |
| Eccentricity |
- |
RV of giant (km/h) |
- |
Separation (AU) |
- |
| Inclination (°) |
0Ref |
Inferior conj. of giant (JD) |
- |
Mass function |
- |
| Eclipses |
- |
|
|
Mass ratio |
0.77Ref |
| Orbital ephemeris |
- |
|
|
|
|
Cool component
| Spectral type |
K or earlierRef |
Mass (M⊙) |
1Ref |
Pulsation |
- |
| Eff. temperature (K) |
4000Ref |
Radius (R⊙) |
80Ref |
Type |
- |
| IR type |
- |
Luminosity (L⊙) |
- |
Pulsation period (days) |
- |
| Metallicity [Fe/H] |
- |
|
|
Pulsation ephemeris |
- |
Hot component
| Type/Spectral type |
WD/BH?Ref |
Mass (M⊙) |
1.3Ref |
Spin period (min) |
- |
| Shell-burning/Accreting-only |
shell-burning?Ref |
Radius (R⊙) |
- |
Accretion disk |
- |
| Eff. temperature (K) |
775000Ref |
Luminosity (L⊙) |
61.3Ref |
|
|
| Lower limit (K) |
- |
|
|
|
|
| Upper limit (K) |
- |
|
|
|
|
Notes
The possible symbiotic nature of this star was suggested by Chiosi et al. (2014). The continuum energy distribution and spectral characteristics demonstrate the presence of a red giant of K or earlier spectral type (Orio et al., 2017). CXO J004318.8+412016 has been observed in X-rays as a luminous supersoft source since 1979, with variable X-ray luminosity.
References
- Chiosi, E., Orio, M., Bernardini, F. et al., 2014, MNRAS, 443, 2, 1821, 2014MNRAS.443.1821C
- Orio, M., Luna, G. J. M., Kotulla, R. et al., 2017, MNRAS, 470, 2, 2212, 2017MNRAS.470.2212O
Last updated: January 12, 2019