Bol D30
SUSPECTED
M31
Constellation
Andromeda |
Equatorial coordinates
α = 00 41 41.475
δ = +41 03 08.118 |
Galactic coordinates
l = 120.9533°
b = -21.7820° |
| Suspected |
2010Ref |
| Confirmed |
- |
| Symbiotic IR type |
- |
| Hot component type |
- |
| Outbursts |
- |
|
|
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 (°) |
10.4228Ref |
Parallax (mas) |
0.117±0.227Ref |
Reddening E(B-V) (mag) |
0.22±0.02Ref, Note |
| Declination (°) |
41.0523Ref |
Distance (kpc) |
785±25Ref
3.30Ref, Note, 16.63Ref, Note |
|
|
| Galactic longitude (°) |
120.9533Ref |
Proper motion in α (mas/yr) |
-0.27±0.21Ref |
|
|
| Galactic latitude (°) |
-21.7820Ref |
Proper motion in δ (mas/yr) |
0.92±0.18Ref |
|
|
Observations
| X-Ray |
NoRef |
IR type |
- |
Radio |
- |
| X-Ray type |
- |
J (mag) |
- |
Flickering |
- |
| GALEX FUV (mag) |
- |
H (mag) |
- |
Outbursts |
- |
| GALEX NUV (mag) |
- |
K (mag) |
16.02Ref |
Outburst type |
- |
| IUE |
NoRef |
WISE W1 (mag) |
- |
Jets |
- |
| FUSE |
NoRef |
WISE W2 (mag) |
- |
Resolved nebula |
- |
| U (mag) |
19.43Ref |
WISE W3 (mag) |
- |
IPmax (eV) |
- |
| B (mag) |
19.35Ref |
WISE W4 (mag) |
- |
[O III] lines |
- |
| V (mag) |
19.02Ref |
IRAS 12μm (Jy) |
- |
He II lines |
- |
| R (mag) |
18.80Ref |
IRAS 25μm (Jy) |
- |
[Fe VII] lines |
- |
| I (mag) |
18.53Ref |
IRAS 60μm (Jy) |
- |
O VI lines |
- |
| BP (mag) |
19.05Ref |
IRAS 100μm (Jy) |
- |
|
|
| G (mag) |
18.91Ref |
AKARI S09 (Jy) |
- |
|
|
| RP (mag) |
18.67Ref |
AKARI S18 (Jy) |
- |
|
|
Orbit
| Orbital period (days) |
- |
γ velocity (km/h) |
-780.00±20.00Ref |
Size of giant’s orbit (AU) |
- |
| Eccentricity |
- |
RV of giant (km/h) |
- |
Separation (AU) |
- |
| Inclination (°) |
- |
Inferior conj. of giant (JD) |
- |
Mass function |
- |
| Eclipses |
- |
|
|
Mass ratio |
- |
| Orbital ephemeris |
- |
|
|
|
|
Cool component
| Spectral type |
F IRef |
Mass (M⊙) |
- |
Pulsation |
- |
| Eff. temperature (K) |
6500Ref |
Radius (R⊙) |
- |
Type |
- |
| IR type |
- |
Luminosity (L⊙) |
15000Ref |
Pulsation period (days) |
- |
| Metallicity [Fe/H] |
- |
|
|
Pulsation ephemeris |
- |
Hot component
| Type/Spectral type |
- |
Mass (M⊙) |
- |
Spin period (min) |
- |
| Shell-burning/Accreting-only |
- |
Radius (R⊙) |
- |
Accretion disk |
- |
| Eff. temperature (K) |
- |
Luminosity (L⊙) |
- |
|
|
| Lower limit (K) |
- |
|
|
|
|
| Upper limit (K) |
- |
|
|
|
|
Notes
The star possesses an extremely negative velocity and is likely situated in the Giant Stream in M31. Caldwell et al. (2010) speculated that the object could potentially be a symbiotic nova.
References
- Caldwell, N., Morrison, H., Kenyon, S. J. et al., 2010, AJ, 139, 2, 372, 2010AJ....139..372C
Last updated: May 11, 2019