FN Sgr
CONFIRMED
MILKY WAY
Constellation
Sagittarius |
Equatorial coordinates
α = 18 53 54.771
δ = -18 59 40.721 |
Galactic coordinates
l = 16.1566°
b = -9.0619° |
| Suspected |
1954Ref |
| Confirmed |
1984Ref |
| Symbiotic IR type |
SRef |
| Hot component type |
shell-burningRef |
| Outbursts |
YesRef - Z AndRef |
|
|
Symbiotic Catalogs
| Bidelman (1954) |
FN Sgr (Susp.) |
Allen (1984) |
FN Sgr (Conf.) |
Belzcyński et al. (2001) |
FN Sgr (Conf.) |
| Gaposchkin (1957) |
- |
Kenyon (1986) |
FN Sgr (Conf.) |
Akras et al. (2019) |
FN Sgr (Conf.) |
| Boyarchuk (1969) |
FN Sgr (Conf.) |
Vaidis (1988, 1991) |
FN Sgr (Conf.) |
Position
| Right ascension (°) |
283.4782Ref |
Parallax (mas) |
0.096±0.036Ref |
Reddening E(B-V) (mag) |
0.12±0.0Ref, Note |
| Declination (°) |
-18.9946Ref |
Distance (kpc) |
4Ref, 2.9±0.6Ref,
3.2±0.6Ref, 5Ref
7.96Ref, Note, 6.24Ref, Note |
|
|
| Galactic longitude (°) |
16.1566Ref |
Proper motion in α (mas/yr) |
-1.86±0.05Ref |
|
|
| Galactic latitude (°) |
-9.0619Ref |
Proper motion in δ (mas/yr) |
-3.84±0.03Ref |
|
|
Observations
| X-Ray |
NoRef |
IR type |
SRef |
Radio |
YesRef |
| X-Ray type |
- |
J (mag) |
8.69Ref |
Flickering |
NoRef |
| GALEX FUV (mag) |
- |
H (mag) |
7.97Ref |
Outbursts |
YesRef |
| GALEX NUV (mag) |
- |
K (mag) |
7.67Ref |
Outburst type |
Z AndRef |
| IUE |
NoRef |
WISE W1 (mag) |
7.80Ref |
Jets |
- |
| FUSE |
NoRef |
WISE W2 (mag) |
7.85Ref |
Resolved nebula |
- |
| U (mag) |
- |
WISE W3 (mag) |
7.42Ref |
IPmax (eV) |
114Ref |
| B (mag) |
13.58Ref |
WISE W4 (mag) |
6.70Ref |
[O III] lines |
YesRef |
| V (mag) |
12.64Ref |
IRAS 12μm (Jy) |
- |
He II lines |
YesRef |
| R (mag) |
- |
IRAS 25μm (Jy) |
- |
[Fe VII] lines |
NoRef |
| I (mag) |
- |
IRAS 60μm (Jy) |
- |
O VI lines |
YesRef |
| BP (mag) |
12.86Ref |
IRAS 100μm (Jy) |
- |
|
|
| G (mag) |
11.87Ref |
AKARI S09 (Jy) |
- |
|
|
| RP (mag) |
10.72Ref |
AKARI S18 (Jy) |
- |
|
|
Orbit
| Orbital period (days) |
568.3±0.3Ref, 563±28Ref,
567.3±0.3Ref |
γ velocity (km/h) |
-53.70±0.20Ref |
Size of giant’s orbit (AU) |
0.54Ref |
| Eccentricity |
0Ref |
RV of giant (km/h) |
10.5±0.4Ref |
Separation (AU) |
1.6Ref |
| Inclination (°) |
80Ref |
Inferior conj. of giant (JD) |
- |
Mass function |
0.0689Ref |
| Eclipses |
YesRef |
|
|
Mass ratio |
2.1Ref, 2.3Ref |
| Orbital ephemeris |
Min (V) = 2450270±2 + 568.3±0.3 x ERef, Min = 2450260 + 567.3±0.3 x ERef |
|
|
|
|
Cool component
| Spectral type |
M4 IIIRef, M4 IIIRef,
M3 IIIRef |
Mass (M⊙) |
1.5Ref |
Pulsation |
- |
| Eff. temperature (K) |
3560Ref |
Radius (R⊙) |
140Ref |
Type |
- |
| IR type |
SRef |
Luminosity (L⊙) |
- |
Pulsation period (days) |
- |
| Metallicity [Fe/H] |
- |
|
|
Pulsation ephemeris |
- |
Hot component
| Type/Spectral type |
- |
Mass (M⊙) |
0.69Ref |
Spin period (min) |
11.3Ref |
| Shell-burning/Accreting-only |
shell-burningRef |
Radius (R⊙) |
0.015Ref, 0.2Ref |
Accretion disk |
- |
| Eff. temperature (K) |
220000Ref, 100000Ref,
150000Ref |
Luminosity (L⊙) |
440Ref, 27000Ref,
1000Ref |
|
|
| Lower limit (K) |
- |
|
|
|
|
| Upper limit (K) |
- |
|
|
|
|
References
- Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
- Allen, D. A., 1984, PASA, 5, 3, 369, 1984PASA....5..369A
- Barba, R., Brandi, E., Garcia, L. et al., 1992, PASP, 104, 330, 1992PASP..104..330B
- Bidelman, W. P., 1954, ApJS, 1, 175, 1954ApJS....1..175B
- Brandi, E., Mikołajewska, J., Quiroga, C. et al., 2005, A&A, 440, 1, 239, 2005A&A...440..239B
- Gromadzki, M., Mikołajewska, J., Soszyński, I., 2013, AcA, 63, 4, 405, 2013AcA....63..405G
- Herbig, G. H., 1950, PASP, 62, 367, 211, 1950PASP...62..211H
- Kato, M., Hachisu, I., 2023, ApJ, 951, 2, 128, 2023ApJ...951..128K
- Medina Tanco, G. A., Steiner, J. E., 1995, AJ, 109, 1770, 1995AJ....109.1770M
- Merrill, P. W., Burwell, C. G., 1950, ApJ, 112, 72, 1950ApJ...112...72M
- Munari, U., Buson, L. M., 1994, A&A, 287, 87, 1994A&A...287...87M
- Ross, F. E., 1926, AJ, 36, 122, 1926AJ.....36..122R
- Sokoloski, J. L., Bildsten, L., Ho, W. C. G., 2001, MNRAS, 326, 2, 553, 2001MNRAS.326..553S
Last updated: January 13, 2024