New Online Database of Symbiotic Variables: omi Cet

Constellation
Cetus

Equatorial coordinates
α = 02 19 20.792
δ = -02 58 39.496

Galactic coordinates
l = 167.7563°
b = -57.9835°

Suspected	1957^Ref
Confirmed	2010^Ref
Symbiotic IR type	D^Ref
Hot component type	accreting-only^Ref
Outbursts	-

Identifiers

omi Cet	IRAS 02168-0312	GSC2.4.2 S0F2000125	AAVSO 000-BBD-706
SIMBAD * omi Cet	Pan-STARRS 104420348370417356	SAO 29825	VSX 9237
GAIA DR3 2493390319631956352	SkyMapper -	WRAY -	GCVS omi Cet
2MASS J02192081-0258393	HIP 10826	Hen -	BD -03 353
WISE J021920.76-025841.3	TYC 4693-1144-1	ESO -	HD 14386

Symbiotic Catalogs

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

Position

Right ascension (°)	34.8366^Ref	Parallax (mas)	-	Reddening E(B-V) (mag)	0.02±0.0^Ref ^{, Note}
Declination (°)	-2.9776^Ref	Distance (kpc)	0.092±0.01^Ref, 0.11^Ref -^{, Note}
Galactic longitude (°)	167.7563^Ref	Proper motion in α (mas/yr)	-
Galactic latitude (°)	-57.9835^Ref	Proper motion in δ (mas/yr)	-

Observations

X-Ray	Yes^Ref	IR type	D^Ref	Radio	Yes^Ref
X-Ray type	β^Ref	J (mag)	-0.73^Ref	Flickering	Yes^Ref
GALEX FUV (mag)	15.20^Ref	H (mag)	-1.57^Ref	Outbursts	-
GALEX NUV (mag)	12.93^Ref	K (mag)	-2.21^Ref	Outburst type	-
IUE	Yes^Ref	WISE W1 (mag)	4.75^Ref	Jets	-
FUSE	Yes^Ref	WISE W2 (mag)	3.36^Ref	Resolved nebula	No^Ref
U (mag)	-	WISE W3 (mag)	0.10^Ref	IPmax (eV)	54.4 (UV)^Ref
B (mag)	7.67^Ref	WISE W4 (mag)	-3.69^Ref	[O III] lines	No^Ref
V (mag)	6.74^Ref	IRAS 12μm (Jy)	4880.00^Ref	He II lines	No^Ref
R (mag)	5.03^Ref	IRAS 25μm (Jy)	2260.00^Ref	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	301.00^Ref	O VI lines	No^Ref
BP (mag)	-	IRAS 100μm (Jy)	88.40^Ref
G (mag)	-	AKARI S09 (Jy)	-
RP (mag)	-	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	181857.975^Ref	γ velocity (km/h)	-	Size of giant’s orbit (AU)	-
Eccentricity	0.16±nan^Ref	RV of giant (km/h)	-	Separation (AU)	70^Ref
Inclination (°)	112^Ref	Inferior conj. of giant (JD)	-	Mass function	-
Eclipses	-			Mass ratio	2.85^Ref
Orbital ephemeris	-

Cool component

Spectral type	M5-9 III^Ref	Mass (M_⊙)	2^Ref	Pulsation	Yes^Ref
Eff. temperature (K)	2918-3192^Ref	Radius (R_⊙)	332-402^Ref	Type	Mira^Ref
IR type	D^Ref	Luminosity (L_⊙)	8400-9360^Ref	Pulsation period (days)	333.09±0.04^Ref
Metallicity [Fe/H]	-0.15±0.18^Ref			Pulsation ephemeris	Max (V) = 2444839 + 333.09±0.04 x E^Ref

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	0.6^Ref, 0.7^Ref	Spin period (min)	-
Shell-burning/Accreting-only	accreting-only^Ref	Radius (R_⊙)	0.012^Ref	Accretion disk	-
Eff. temperature (K)	10000-20000^Ref	Luminosity (L_⊙)	-
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

The nature of omi Cet was debated in the literature for a long time. Kenyon & Webbink (1984) listed the object as an extreme example of the symbiotic phenomenon. Nowadays, the system is considered to be an accreting-only symbiotic star consisting of a Mira pulsator and a WD (resolved at several wavelengths; Karovska, 2006) on an orbit with an orbital period of 497.9 years (Prieur et al., 2002). It was detected in X-ray outburst by Karovska et al. (2005). Many aspects have been well-reviewed in the Introduction of the paper by Nhung et al. (2022).

References

Karovska, M., Hack, W., Raymond, J. et al., 1997, ApJL, 482, 2, L175, 1997ApJ...482L.175K
Karovska, M., Schlegel, E., Hack, W. et al., 2005, ApJL, 623, 2, L137, 2005ApJ...623L.137K
Karovska, M., 2006, The X-ray Universe 2005, 604, 183, 2006ESASP.604..183K
Kastner, J. H., Soker, N., 2004, ApJ, 616, 2, 1188, 2004ApJ...616.1188K
Kenyon, S. J., Webbink, R. F., 1984, ApJ, 279, 252, 1984ApJ...279..252K
Nhung, P. T., Hoai, D. T., Tuan-Anh, P. et al., 2022, ApJ, 927, 2, 169, 2022ApJ...927..169N
Prieur, J. L., Aristidi, E., Lopez, B. et al., 2002, ApJS, 139, 1, 249, 2002ApJS..139..249P
Sokoloski, J. L., Bildsten, L., 2010, ApJ, 723, 2, 1188, 2010ApJ...723.1188S
Templeton, M. R., Karovska, M., 2009, ApJ, 691, 2, 1470, 2009ApJ...691.1470T
Woodruff, H. C., Eberhardt, M., Driebe, T. et al., 2004, A&A, 421, 703, 2004A&A...421..703W
Zamanov, R. K., Boeva, S., Spassov, B. et al., 2019, BlgAJ, 31, 110, 2019BlgAJ..31..110Z

omi Cet