New Online Database of Symbiotic Variables: V840 Cen

Constellation
Centaurus

Equatorial coordinates
α = 13 20 49.452
δ = -55 50 14.678

Galactic coordinates
l = 307.0788°
b = 6.7975°

Suspected	1987^Ref
Confirmed	1989^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref

Identifiers

V840 Cen	IRAS -	GSC2.4.2 S7OB000177	AAVSO 000-BCV-351
SIMBAD V* V840 Cen	Pan-STARRS -	SAO -	VSX 8137
GAIA DR3 6063900742825792000	SkyMapper -	WRAY -	GCVS V0840 Cen
2MASS J13204946-5550146	HIP -	Hen -	BD -
WISE J132049.42-555014.3	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	-	Belzcyński et al. (2001)	V840 Cen (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	-	Akras et al. (2019)	V840 Cen (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	V840 Cen (Conf.)

Position

Right ascension (°)	200.2060^Ref	Parallax (mas)	0.444±0.016^Ref	Reddening E(B-V) (mag)	0.75±0.04^Ref ^{, Note}
Declination (°)	-55.8374^Ref	Distance (kpc)	2.07^Ref ^{, Note}, 2.07^Ref ^{, Note}
Galactic longitude (°)	307.0788^Ref	Proper motion in α (mas/yr)	-5.37±0.01^Ref
Galactic latitude (°)	6.7975^Ref	Proper motion in δ (mas/yr)	-7.45±0.01^Ref

Observations

X-Ray	-	IR type	S^Ref	Radio	-
X-Ray type	-	J (mag)	11.81^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	11.08^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	-	K (mag)	10.90^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	10.27^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	10.20^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	9.81^Ref	IPmax (eV)	54.4^Ref
B (mag)	15.42^Ref	WISE W4 (mag)	8.84^Ref	[O III] lines	No^Ref
V (mag)	14.14^Ref	IRAS 12μm (Jy)	-	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	-	[Fe VII] lines	No^Ref
I (mag)	12.95^Ref	IRAS 60μm (Jy)	-	O VI lines	No^Ref
BP (mag)	14.96^Ref	IRAS 100μm (Jy)	-
G (mag)	14.07^Ref	AKARI S09 (Jy)	-
RP (mag)	13.13^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	792±26^Ref	γ velocity (km/h)	-44.51±4.46^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	Min (V) = 2452061 + 792±26 x E^Ref

Cool component

Spectral type	K5^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	-	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)	-	Luminosity (L_⊙)	-
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

A strong outburst was reported in 1986 (Liller, 1986). The cool component exhibits an unusually rapid rotation, as documented in Zamanov et al. (2008).

References

Duerbeck, H. W., Seitter, W. C., 1989, PASP, 101, 673, 1989PASP..101..673D
Liller, W., 1986, IAUC, 4180, 1, 1986IAUC.4180....1L
Zamanov, R. K., Bode, M. F., Melo, C. H. F. et al., 2008, MNRAS, 390, 1, 377, 2008MNRAS.390..377Z

V840 Cen