St 2-22

CONFIRMED MILKY WAY

Constellation
Centaurus

Equatorial coordinates
α = 13 14 30.289
δ = -58 51 49.646

Galactic coordinates
l = 305.9169°
b = 3.8742°

Suspected	1984^Ref
Confirmed	1984^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref - Z And^Ref

Identifiers

St 2-22	IRAS -	GSC2.4.2 S7NP049805	AAVSO 000-BJT-822
SIMBAD PN Sa 3-22	Pan-STARRS -	SAO -	VSX 241017
GAIA DR3 6062183580570935936	SkyMapper 131430.30-585149.6	WRAY -	GCVS -
2MASS J13143030-5851495	HIP -	Hen -	BD -
WISE J131430.29-585149.6	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	St2-22 (Conf.)	Belzcyński et al. (2001)	St 2-22 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	St2-22 (Conf.)	Akras et al. (2019)	Sa 3-22 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	PN Sa3-22 (Conf.)

Position

Right ascension (°)	198.6262^Ref	Parallax (mas)	0.086±0.023^Ref	Reddening E(B-V) (mag)	0.8±0.03^Ref ^{, Note}
Declination (°)	-58.8638^Ref	Distance (kpc)	5^Ref 6.88^Ref ^{, Note}, 6.84^Ref ^{, Note}
Galactic longitude (°)	305.9169^Ref	Proper motion in α (mas/yr)	-5.71±0.02^Ref
Galactic latitude (°)	3.8742^Ref	Proper motion in δ (mas/yr)	-1.09±0.02^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	-
X-Ray type	-	J (mag)	9.73^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	8.68^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	-	K (mag)	8.21^Ref	Outburst type	Z And^Ref
IUE	No^Ref	WISE W1 (mag)	8.14^Ref	Jets	Yes^Ref
FUSE	No^Ref	WISE W2 (mag)	8.20^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	7.82^Ref	IPmax (eV)	114^Ref
B (mag)	-	WISE W4 (mag)	7.47^Ref	[O III] lines	No^Ref
V (mag)	-	IRAS 12μm (Jy)	-	He II lines	No^Ref
R (mag)	13.91^Ref	IRAS 25μm (Jy)	-	[Fe VII] lines	Yes^Ref
I (mag)	12.06^Ref	IRAS 60μm (Jy)	-	O VI lines	Yes^Ref
BP (mag)	15.92^Ref	IRAS 100μm (Jy)	-
G (mag)	13.75^Ref	AKARI S09 (Jy)	-
RP (mag)	12.37^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	918±6^Ref	γ velocity (km/h)	31.98±0.30^Ref, 31.03±4.42^Ref	Size of giant’s orbit (AU)	-
Eccentricity	0.16±0.07^Ref	RV of giant (km/h)	7.03±0.45^Ref	Separation (AU)	2.67^Ref
Inclination (°)	72^Ref, 52-70^Ref	Inferior conj. of giant (JD)	-	Mass function	0.0331^Ref
Eclipses	-			Mass ratio	3^Ref, 3.5^Ref
Orbital ephemeris	T0 = 2458661±52 + 918±6 x E^Ref

Cool component

Spectral type	M2^Ref, M4.5^Ref, M5^Ref	Mass (M_⊙)	1.5^Ref, 2.8±0.7^Ref	Pulsation	Yes^Ref
Eff. temperature (K)	3580^Ref, 3400^Ref	Radius (R_⊙)	90^Ref, 117±20^Ref	Type	SR or OGLE Small Amplitude Red Giant^Ref
IR type	S^Ref	Luminosity (L_⊙)	1140^Ref, 1631^Ref	Pulsation period (days)	277.8±1.7^Ref
Metallicity [Fe/H]	-0.25±-^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	0.5^Ref, 0.8±0.2^Ref	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.05^Ref	Accretion disk	Yes?^Ref
Eff. temperature (K)	-	Luminosity (L_⊙)	600^Ref, 1380^Ref
Lower limit (K)	54000^Ref
Upper limit (K)	100000^Ref

Links

SIMBAD CDS Portal

Notes

Tomov et al. (2017) reported the detection of satellite emission components in the Hα line, interpreted as indicative of jets in the system.

References

Allen, D. A., 1984, PASA, 5, 3, 369, 1984PASA....5..369A
Gałan, C., Mikołajewska, J., Iłkiewicz, K. et al., 2022, A&A, 657, A137, 2022A&A...657A.137G
Mikołajewska, J., Acker, A., Stenholm, B., 1997, A&A, 327, 191, 1997A&A...327..191M
Tomov, T., Zamanov, R. K., Gałan, C. et al., 2017, AcA, 67, 3, 225, 2017AcA....67..225T

Last updated: March 5, 2022