Hen 2-173

CONFIRMED MILKY WAY

Constellation
Scorpius

Equatorial coordinates
α = 16 36 24.629
δ = -39 51 44.468

Galactic coordinates
l = 342.7701°
b = 5.0107°

Suspected	1973^Ref
Confirmed	1984^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

Hen 2-173	IRAS -	GSC2.4.2 S8V9000555	AAVSO 000-BJT-828
SIMBAD WRAY 15-1518	Pan-STARRS -	SAO -	VSX 241029
GAIA DR3 6017382944157509760	SkyMapper 163624.63-395144.4	WRAY 15-1518	GCVS -
2MASS J16362464-3951444	HIP -	Hen 2-173	BD -
WISE J163624.64-395144.3	TYC -	ESO 331-7	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	He2-173 (Conf.)	Belzcyński et al. (2001)	Hen 2-173 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	He2-173 (Conf.)	Akras et al. (2019)	Hen 2-173 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	M-70 (Conf.)

Position

Right ascension (°)	249.1026^Ref	Parallax (mas)	0.196±0.034^Ref	Reddening E(B-V) (mag)	0.67±0.06^Ref ^{, Note}
Declination (°)	-39.8624^Ref	Distance (kpc)	2.8^Ref 4.98^Ref ^{, Note}, 4.40^Ref ^{, Note}
Galactic longitude (°)	342.7701^Ref	Proper motion in α (mas/yr)	-7.10±0.05^Ref
Galactic latitude (°)	5.0107^Ref	Proper motion in δ (mas/yr)	-4.86±0.04^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	8.16^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	7.03^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	6.53^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	6.46^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	6.25^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	6.23^Ref	IPmax (eV)	54.4^Ref
B (mag)	13.30^Ref	WISE W4 (mag)	5.85^Ref	[O III] lines	Yes^Ref
V (mag)	13.83^Ref	IRAS 12μm (Jy)	-	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	-	[Fe VII] lines	No^Ref
I (mag)	10.97^Ref	IRAS 60μm (Jy)	-	O VI lines	No^Ref
BP (mag)	13.92^Ref	IRAS 100μm (Jy)	-
G (mag)	12.22^Ref	AKARI S09 (Jy)	0.24^Ref
RP (mag)	10.90^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	910.6±10.6^Ref	γ velocity (km/h)	-54.29±0.30^Ref	Size of giant’s orbit (AU)	-
Eccentricity	0.21±0.051^Ref	RV of giant (km/h)	8.36±0.45^Ref	Separation (AU)	-
Inclination (°)	-	Inferior conj. of giant (JD)	2452662.5	Mass function	0.0517^Ref
Eclipses	Yes?^Ref			Mass ratio	-
Orbital ephemeris	Min (-) = 2452625±36 + 910.6±10.6 x E^Ref

Cool component

Spectral type	M6 III^Ref, M3 III^Ref, M4.5 III^Ref	Mass (M_⊙)	1.5^Ref	Pulsation	-
Eff. temperature (K)	3073^Ref, 3400^Ref	Radius (R_⊙)	100-149^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	9298^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-0.18±0.08^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	-	Luminosity (L_⊙)	700^Ref
Lower limit (K)	54000^Ref
Upper limit (K)	100000^Ref

Links

SIMBAD CDS Portal

Notes

Classified as a stellar source in Sanduleak & Stephenson (1973).

References

Allen, D. A., 1973, MNRAS, 161, 145, 1973MNRAS.161..145A
Allen, D. A., 1982, IAU Colloq. 70: The Nature of Symbiotic Stars, 95, 27, 1982ASSL...95...27A
Allen, D. A., 1984, PASA, 5, 3, 369, 1984PASA....5..369A
Fekel, F. C., Hinkle, K. H., Joyce, R. R. et al., 2007, AJ, 133, 1, 17, 2007AJ....133...17F
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2016, MNRAS, 455, 2, 1282, 2016MNRAS.455.1282G
Medina Tanco, G. A., Steiner, J. E., 1995, AJ, 109, 1770, 1995AJ....109.1770M
Mikołajewska, J., Acker, A., Stenholm, B., 1997, A&A, 327, 191, 1997A&A...327..191M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Sanduleak, N., Stephenson, C. B., 1973, ApJ, 185, 899, 1973ApJ...185..899S
Stenholm, B., Acker, A., 1987, A&AS, 68, 51, 1987A&AS...68...51S

Last updated: April 16, 2022