New Online Database of Symbiotic Variables: Hen 2-176

Constellation
Scorpius

Equatorial coordinates
α = 16 41 31.202
δ = -45 13 04.716

Galactic coordinates
l = 339.3933°
b = 0.7448°

Suspected	1974^Ref
Confirmed	1984^Ref
Symbiotic IR type	D^Ref, S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

Hen 2-176	IRAS 16379-4507	GSC2.4.2 S8UV017816	AAVSO -
SIMBAD WRAY 16-230	Pan-STARRS -	SAO -	VSX 59169
GAIA DR3 5943382139466094720	SkyMapper 164131.19-451304.5	WRAY 16-230	GCVS -
2MASS J16413119-4513046	HIP -	Hen 2-176	BD -
WISE J164131.15-451304.8	TYC -	ESO 277-5	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	He2-176 (Conf.)	Belzcyński et al. (2001)	Hen 2-176 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	He2-176 (Conf.)	Akras et al. (2019)	Hen 2-176 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	M-73 (Conf.)

Position

Right ascension (°)	250.3800^Ref	Parallax (mas)	0.043±0.092^Ref	Reddening E(B-V) (mag)	5.91±0.46^Ref ^{, Note}
Declination (°)	-45.2180^Ref	Distance (kpc)	2.6^Ref 6.25^Ref ^{, Note}, 4.05^Ref ^{, Note}
Galactic longitude (°)	339.3933^Ref	Proper motion in α (mas/yr)	-4.31±0.11^Ref
Galactic latitude (°)	0.7448^Ref	Proper motion in δ (mas/yr)	-7.15±0.09^Ref

Observations

X-Ray	No^Ref	IR type	D^Ref, S^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	8.17^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	6.66^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	5.78^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	5.28^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	4.85^Ref	Resolved nebula	No^Ref
U (mag)	-	WISE W3 (mag)	4.23^Ref	IPmax (eV)	114^Ref
B (mag)	-	WISE W4 (mag)	2.47^Ref	[O III] lines	Yes^Ref
V (mag)	15.00^Ref	IRAS 12μm (Jy)	2.81^Ref	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	2.40^Ref	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	47.20^Ref	O VI lines	Yes^Ref
BP (mag)	16.08^Ref	IRAS 100μm (Jy)	289.00^Ref
G (mag)	13.61^Ref	AKARI S09 (Jy)	1.09^Ref
RP (mag)	11.96^Ref	AKARI S18 (Jy)	0.97^Ref

Orbit

Orbital period (days)	-	γ velocity (km/h)	-	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	M7 III^Ref, M4 III^Ref	Mass (M_⊙)	-	Pulsation	Yes?^Ref
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	Mira?^Ref
IR type	D^Ref, S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	-
Metallicity [Fe/H]	-			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_⊙)	4300^Ref
Lower limit (K)	114000^Ref
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

This stellar source, initially found with no emission lines in the blue by Webster (1966), has been subsequently observed with emission lines with ionization potential up to 114 eV by Allen (1984) and Stenholm & Acker (1987).

References

Allen, D. A., Glass, I. S., 1974, MNRAS, 167, 337, 1974MNRAS.167..337A
Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Allen, D. A., 1984, PASA, 5, 3, 369, 1984PASA....5..369A
Mikołajewska, J., Acker, A., Stenholm, B., 1997, A&A, 327, 191, 1997A&A...327..191M
Munari, U., Patat, F., 1993, A&A, 277, 195, 1993A&A...277..195M
Stenholm, B., Acker, A., 1987, A&AS, 68, 51, 1987A&AS...68...51S
Webster, B. L., 1966, PASP, 78, 462, 136, 1966PASP...78..136W
Wright, A. E., Allen, D. A., 1978, MNRAS, 184, 893, 1978MNRAS.184..893W

Hen 2-176