New Online Database of Symbiotic Variables: HK Sco

Constellation
Scorpius

Equatorial coordinates
α = 16 54 41.036
δ = -30 23 06.979

Galactic coordinates
l = 352.4854°
b = 8.2663°

Suspected	1941^Ref
Confirmed	1941^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref - Z And^Ref

Identifiers

HK Sco	IRAS -	GSC2.4.2 S8ET000568	AAVSO 000-BBY-148
SIMBAD V* HK Sco	Pan-STARRS 71532536710697836	SAO -	VSX 33027
GAIA DR3 6029494923730923904	SkyMapper 165441.04-302306.9	WRAY 15-1563	GCVS HK Sco
2MASS J16544103-3023067	HIP -	Hen -	BD -
WISE J165441.03-302306.9	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	HK Sco (Conf.)	Allen (1984)	HK Sco (Conf.)	Belzcyński et al. (2001)	HK Sco (Conf.)
Gaposchkin (1957)	HK Sco (Conf.)	Kenyon (1986)	HK Sco (Conf.)	Akras et al. (2019)	HK Sco (Conf.)
Boyarchuk (1969)	HK Sco (Susp.)	Vaidis (1988, 1991)	HK Sco (Conf.)

Position

Right ascension (°)	253.6710^Ref	Parallax (mas)	0.098±0.022^Ref	Reddening E(B-V) (mag)	0.31±0.01^Ref ^{, Note}
Declination (°)	-30.3853^Ref	Distance (kpc)	2.8^Ref 8.79^Ref ^{, Note}, 7.16^Ref ^{, Note}
Galactic longitude (°)	352.4854^Ref	Proper motion in α (mas/yr)	-3.09±0.03^Ref
Galactic latitude (°)	8.2663^Ref	Proper motion in δ (mas/yr)	-6.04±0.02^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	-	J (mag)	9.02^Ref	Flickering	No^Ref
GALEX FUV (mag)	-	H (mag)	8.12^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	-	K (mag)	7.70^Ref	Outburst type	Z And^Ref
IUE	No^Ref	WISE W1 (mag)	7.70^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.69^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	7.37^Ref	IPmax (eV)	114^Ref
B (mag)	15.35^Ref	WISE W4 (mag)	6.83^Ref	[O III] lines	No^Ref
V (mag)	13.84^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)	13.65^Ref	IRAS 100μm (Jy)	-
G (mag)	12.27^Ref	AKARI S09 (Jy)	-
RP (mag)	11.08^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	458±21^Ref	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	No^Ref			Mass ratio	-
Orbital ephemeris	Min (V) = 2452023 + 458±21 x E^Ref

Cool component

Spectral type	M1 III^Ref, M1 III^Ref, M3.5 III^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	3790^Ref	Radius (R_⊙)	-	Type	-
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	-
Metallicity [Fe/H]	-			Pulsation ephemeris	-

Hot component

Type/Spectral type	-	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	65000-100000^Ref	Luminosity (L_⊙)	-
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

Elvey (1941) reported a faint continuous spectrum with Balmer lines and He II. Additionally, Swope (1941) observed variability in the star, including outbursts.

References

Allen, D. A., 1978, MNRAS, 184, 601, 1978MNRAS.184..601A
Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Elvey, C. T., 1941, ApJ, 94, 140, 1941ApJ....94..140E
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
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
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
Swope, H. H., 1941, ApJ, 94, 140, 1941ApJ....94..140S

HK Sco