Hen 2-374

CONFIRMED MILKY WAY

Constellation
Sagittarius

Equatorial coordinates
α = 18 15 31.060
δ = -21 35 22.835

Galactic coordinates
l = 9.7313°
b = -2.2127°

Suspected	1973^Ref
Confirmed	1978^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

Hen 2-374	IRAS -	GSC2.4.2 SA6M093539	AAVSO 000-BJT-857
SIMBAD Hen 2-374	Pan-STARRS 82092738794402723	SAO -	VSX 241087
GAIA DR3 4090888798194893184	SkyMapper 181531.05-213522.7	WRAY -	GCVS -
2MASS J18153106-2135228	HIP -	Hen 2-374	BD -
WISE J181531.05-213522.6	TYC -	ESO 590-10	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	He2-374 (Conf.)	Belzcyński et al. (2001)	Hen 2-374 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	He2-374 (Conf.)	Akras et al. (2019)	Hen 2-374 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	M-159 (Conf.)

Position

Right ascension (°)	273.8794^Ref	Parallax (mas)	0.349±0.052^Ref	Reddening E(B-V) (mag)	1.74±0.11^Ref ^{, Note}
Declination (°)	-21.5897^Ref	Distance (kpc)	2.5^Ref 2.95^Ref ^{, Note}, 2.78^Ref ^{, Note}
Galactic longitude (°)	9.7313^Ref	Proper motion in α (mas/yr)	-6.07±0.05^Ref
Galactic latitude (°)	-2.2127^Ref	Proper motion in δ (mas/yr)	-1.59±0.04^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	8.01^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	6.85^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	6.40^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	6.02^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	6.06^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	5.92^Ref	IPmax (eV)	114^Ref
B (mag)	16.07^Ref	WISE W4 (mag)	5.62^Ref	[O III] lines	No^Ref
V (mag)	14.28^Ref	IRAS 12μm (Jy)	-	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	-	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	-	O VI lines	Yes^Ref
BP (mag)	14.49^Ref	IRAS 100μm (Jy)	-
G (mag)	12.07^Ref	AKARI S09 (Jy)	0.21^Ref
RP (mag)	10.65^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	820.3±4.1^Ref	γ velocity (km/h)	21.93±0.26^Ref, 16.73±2.82^Ref	Size of giant’s orbit (AU)	0.58^Ref
Eccentricity	0^Ref	RV of giant (km/h)	7.88±0.47^Ref	Separation (AU)	-
Inclination (°)	-	Inferior conj. of giant (JD)	2453172.8	Mass function	0.0416^Ref
Eclipses	-			Mass ratio	2.4^Ref
Orbital ephemeris	-

Cool component

Spectral type	M5 III^Ref, M4 III^Ref, M5.5 III^Ref	Mass (M_⊙)	1.6^Ref	Pulsation	Yes^Ref
Eff. temperature (K)	3430^Ref, 3300^Ref	Radius (R_⊙)	114-131^Ref	Type	SR^Ref
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	54±1^Ref
Metallicity [Fe/H]	-0.52±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_⊙)	1300^Ref
Lower limit (K)	75000^Ref
Upper limit (K)	100000^Ref

Links

SIMBAD CDS Portal

Notes

References

Allen, D. A., 1978, MNRAS, 184, 601, 1978MNRAS.184..601A
Fekel, F. C., Hinkle, K. H., Joyce, R. R. et al., 2010, AJ, 139, 4, 1315, 2010AJ....139.1315F
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2016, MNRAS, 455, 2, 1282, 2016MNRAS.455.1282G
Gromadzki, M., Mikołajewska, J., Soszyński, I., 2013, AcA, 63, 4, 405, 2013AcA....63..405G
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 18, 2022