New Online Database of Symbiotic Variables: THA 15-31

Constellation
Scorpius

Equatorial coordinates
α = 16 08 36.899
δ = -40 16 20.479

Galactic coordinates
l = 338.7237°
b = 8.5166°

Suspected	2022^Ref
Confirmed	2022^Ref
Symbiotic IR type	S^Ref
Hot component type	accreting-only^Ref
Outbursts	-

Identifiers

THA 15-31	IRAS -	GSC2.4.2 S8UL062235	AAVSO -
SIMBAD THA 15-31	Pan-STARRS -	SAO -	VSX 2287561
GAIA DR3 5996774011771441152	SkyMapper 160836.90-401620.4	WRAY -	GCVS -
2MASS J16083689-4016205	HIP -	Hen -	BD -
WISE J160836.90-401620.3	TYC -	ESO -	HD -

Symbiotic Catalogs

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

Position

Right ascension (°)	242.1537^Ref	Parallax (mas)	0.042±0.040^Ref	Reddening E(B-V) (mag)	0.49±0.01^Ref ^{, Note}
Declination (°)	-40.2724^Ref	Distance (kpc)	12±0.6^Ref 9.59^Ref ^{, Note}, 7.61^Ref ^{, Note}
Galactic longitude (°)	338.7237^Ref	Proper motion in α (mas/yr)	-2.31±0.05^Ref
Galactic latitude (°)	8.5166^Ref	Proper motion in δ (mas/yr)	-6.13±0.03^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	-	J (mag)	9.02^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	8.01^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	7.59^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	7.42^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.45^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	7.05^Ref	IPmax (eV)	13.6^Ref
B (mag)	16.26^Ref	WISE W4 (mag)	7.00^Ref	[O III] lines	No^Ref
V (mag)	14.85^Ref	IRAS 12μm (Jy)	-	He II lines	No^Ref
R (mag)	-	IRAS 25μm (Jy)	-	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	-	O VI lines	No^Ref
BP (mag)	15.17^Ref	IRAS 100μm (Jy)	-
G (mag)	12.85^Ref	AKARI S09 (Jy)	-
RP (mag)	11.46^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	-	γ velocity (km/h)	12.45±1.45^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	-
Orbital ephemeris	-

Cool component

Spectral type	M6 III^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	-
IR type	S^Ref	Luminosity (L_⊙)	6400^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD + accretion disk^Ref	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	accreting-only^Ref	Radius (R_⊙)	-	Accretion disk	Yes^Ref
Eff. temperature (K)	-	Luminosity (L_⊙)	100^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

The object was previously considered a candidate young stellar object, it has been reclassified as an accreting-only symbiotic star by Munari et al. (2022).

References

Munari, U., Alcalá, J. M., Frasca, A. et al., 2022, A&A, 661, A124, 2022A&A...661A.124M

THA 15-31