SMC N73

CONFIRMED SMC

Constellation
Hydrus

Equatorial coordinates
α = 01 04 39.311
δ = -75 48 24.787

Galactic coordinates
l = 301.8541°
b = -41.2937°

Suspected	1983^Ref
Confirmed	1983^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

SMC N73	IRAS -	GSC2.4.2 S0XE048615	AAVSO 000-BLT-630
SIMBAD LHA 115-N 73	Pan-STARRS -	SAO -	VSX 410498
GAIA DR3 4636419124474360448	SkyMapper 010439.26-754824.8	WRAY -	GCVS -
2MASS J01043930-7548247	HIP -	Hen -	BD -
WISE J010439.30-754824.7	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	SMC N73 (Conf.)	Belzcyński et al. (2001)	SMC N73 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	SMC N73 (Conf.)	Akras et al. (2019)	SMC N73 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	Lin 445a (Conf.)

Position

Right ascension (°)	16.1638^Ref	Parallax (mas)	-0.023±0.019^Ref	Reddening E(B-V) (mag)	0.04±0.0^Ref ^{, Note}
Declination (°)	-75.8069^Ref	Distance (kpc)	62.1±1.9^Ref 22.52^Ref ^{, Note}, 20.91^Ref ^{, Note}
Galactic longitude (°)	301.8541^Ref	Proper motion in α (mas/yr)	1.18±0.02^Ref
Galactic latitude (°)	-41.2937^Ref	Proper motion in δ (mas/yr)	-1.41±0.02^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	-
X-Ray type	-	J (mag)	12.55^Ref	Flickering	-
GALEX FUV (mag)	19.91^Ref	H (mag)	11.71^Ref	Outbursts	-
GALEX NUV (mag)	20.53^Ref	K (mag)	11.49^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	11.37^Ref	Jets	-
FUSE	Yes^Ref	WISE W2 (mag)	11.46^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	11.27^Ref	IPmax (eV)	114^Ref
B (mag)	17.30^Ref	WISE W4 (mag)	9.03^Ref	[O III] lines	No^Ref
V (mag)	15.60^Ref	IRAS 12μm (Jy)	-	He II lines	Yes^Ref
R (mag)	15.52^Ref	IRAS 25μm (Jy)	-	[Fe VII] lines	No^Ref
I (mag)	13.88^Ref	IRAS 60μm (Jy)	-	O VI lines	Yes^Ref
BP (mag)	16.02^Ref	IRAS 100μm (Jy)	-
G (mag)	15.00^Ref	AKARI S09 (Jy)	-
RP (mag)	14.00^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	-	γ velocity (km/h)	163.38±3.07^Ref	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	11.7?^Ref
Orbital ephemeris	-

Cool component

Spectral type	K7^Ref	Mass (M_⊙)	2±0.55^Ref	Pulsation	-
Eff. temperature (K)	3850^Ref, 3590±50^Ref	Radius (R_⊙)	150^Ref, 208±16^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	4500^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-0.75±0.12^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	>0.17^Ref	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.1^Ref	Accretion disk	-
Eff. temperature (K)	130000±10000^Ref, 200000^Ref	Luminosity (L_⊙)	3000±1000^Ref, 14000^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

The star was proposed to be a symbiotic star based on the visibility of a strong UV continuum with TiO and a strong He II λ4686 emission line.

References

Morgan, D. H., 1992, MNRAS, 258, 639, 1992MNRAS.258..639M
Mürset, U., Schild, H., Vogel, M., 1996, A&A, 307, 516, 1996A&A...307..516M
Walker, A. R., 1983, MNRAS, 203, 25, 1983MNRAS.203...25W
Washington, J. E., Lewis, H. M., Anguiano, B. et al., 2021, ApJ, 918, 1, 19, 2021ApJ...918...19W

Last updated: August 21, 2021