Z And

Constellation
Andromeda

Equatorial coordinates
α = 23 33 39.953
δ = +48 49 05.926

Galactic coordinates
l = 109.9792°
b = -12.0877°

Suspected	1932^Ref
Confirmed	1932^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref - Z And^Ref

Identifiers

Z And	IRAS 23312+4832	GSC2.4.2 N16Z021710	AAVSO 000-BCR-681
SIMBAD V* Z And	Pan-STARRS 166583534163232875	SAO 53146	VSX 9
GAIA DR3 1941894322438077312	SkyMapper -	WRAY -	GCVS Z And
2MASS J23333994+4849059	HIP 116287	Hen -	BD +48 4093
WISE J233339.95+484905.7	TYC 3645-2066-1	ESO -	HD 221650

Symbiotic Catalogs

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

Position

Right ascension (°)	353.4165^Ref	Parallax (mas)	0.487±0.022^Ref	Reddening E(B-V) (mag)	0.19±0.01^Ref ^{, Note}
Declination (°)	48.8183^Ref	Distance (kpc)	1.23^Ref, 1.12^Ref, 1.5^Ref 1.92^Ref ^{, Note}, 1.89^Ref ^{, Note}
Galactic longitude (°)	109.9792^Ref	Proper motion in α (mas/yr)	-1.73±0.02^Ref
Galactic latitude (°)	-12.0877^Ref	Proper motion in δ (mas/yr)	-3.04±0.02^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	β^Ref	J (mag)	6.19^Ref	Flickering	No^Ref, No^Ref, Yes?^Ref
GALEX FUV (mag)	-	H (mag)	5.29^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	-	K (mag)	4.89^Ref	Outburst type	Z And^Ref
IUE	Yes^Ref	WISE W1 (mag)	4.60^Ref	Jets	Yes^Ref
FUSE	Yes^Ref	WISE W2 (mag)	4.40^Ref	Resolved nebula	No^Ref
U (mag)	8.86^Ref	WISE W3 (mag)	4.09^Ref	IPmax (eV)	114^Ref
B (mag)	9.35^Ref	WISE W4 (mag)	3.48^Ref	[O III] lines	No^Ref
V (mag)	8.00^Ref	IRAS 12μm (Jy)	0.68^Ref	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	0.24^Ref	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	0.40^Ref	O VI lines	Yes^Ref
BP (mag)	10.16^Ref	IRAS 100μm (Jy)	4.77^Ref
G (mag)	9.13^Ref	AKARI S09 (Jy)	0.98^Ref
RP (mag)	8.02^Ref	AKARI S18 (Jy)	0.39^Ref

Orbit

Orbital period (days)	756.85±0.99^Ref, 757.5±2.2^Ref, 759.0±1.9^Ref	γ velocity (km/h)	-1.8±0.2^Ref, -0.59±0.17^Ref	Size of giant’s orbit (AU)	0.47^Ref, 0.469^Ref
Eccentricity	0^Ref	RV of giant (km/h)	6.8±0.4^Ref, 6.73±0.22^Ref	Separation (AU)	2.23^Ref
Inclination (°)	47±23^Ref, 76-90^Ref, 59-74^Ref	Inferior conj. of giant (JD)	2445703,2450449.9	Mass function	0.024^Ref, 0.024^Ref
Eclipses	No^Ref, Yes?^Ref			Mass ratio	3.08^Note
Orbital ephemeris	Min (V) = 2421298±15 + 756.85±0.99 x E^Ref, Min (UBV) = 2442668±9 + 757.5±2.2 x E^Ref

Cool component

Spectral type	M3.5 III^Ref, M3-4 III^Ref, M4.5 III^Ref	Mass (M_⊙)	2^Ref	Pulsation	-
Eff. temperature (K)	3200^Ref, 3400±50^Ref, 3400^Ref	Radius (R_⊙)	100^Ref, 140^Ref, 85±4^Ref, 106^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	1400^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-0.06±0.08^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	0.5-1^Ref, 0.65±0.28^Ref, 0.64^Ref	Spin period (min)	28.043^Ref, 26.7^Ref
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.07^Ref, 0.053-0.1^Ref, 0.06^Ref	Accretion disk	-
Eff. temperature (K)	100000^Ref, 107000-148000^Ref, 100000-200000^Ref, 105000-130000^Ref, 120000^Ref	Luminosity (L_⊙)	620-1600^Ref, 2300^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

In Sokoloski & Bildsten (1999), it was suggested that the white dwarf in Z And possesses a strong magnetic field and rotates with a period of 1682.6 seconds. A combination nova model, involving both an accretion instability and an increase in thermonuclear shell burning, was proposed to explain the variability of Z And by Sokoloski et al. (2006). Additionally, Isogai et al. (2010) determined inclinations of approximately 73° from the polarization in the continuum and 41° from the Raman scattered O VI line.

References

Aller, L. H., 1953, PDAO, 9, 321, 1953PDAO....9..321A
Bisikalo, D. V., Boyarchuk, A. A., Kilpio, E. Y. et al., 2002, ARep, 46, 12, 1022, 2002ARep...46.1022B
Boyarchuk, A. A., 1968, SvA, 11, 818, 1968SvA....11..818B
Brocksopp, C., Sokoloski, J. L., Kaiser, C. et al., 2004, MNRAS, 347, 2, 430, 2004MNRAS.347..430B
Fekel, F. C., Joyce, R. R., Hinkle, K. H. et al., 2000, AJ, 119, 3, 1375, 2000AJ....119.1375F
Fernandez-Castro, T., González-Riestra, R., Cassatella, A. et al., 1995, ApJ, 442, 366, 1995ApJ...442..366F
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2023, MNRAS, 526, 1, 918, 2023MNRAS.526..918G
Greenstein, N. K., 1937, BHarO, 906, 3, 1937BHarO.906....3G
Hogg, F. S., 1932, PASP, 44, 261, 328, 1932PASP...44..328H
Isogai, M., Seki, M., Ikeda, Y. et al., 2010, AJ, 140, 1, 235, 2010AJ....140..235I
Mattei, J. A., 1978, JRASC, 72, 61, 1978JRASC..72...61M
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Mikołajewska, J., Kenyon, S. J., 1996, AJ, 112, 1659, 1996AJ....112.1659M
Nussbaumer, H., Vogel, M., 1989, A&A, 213, 137, 1989A&A...213..137N
Pickering, E. C., Colson, H. R., Fleming, W. P. et al., 1901, ApJ, 13, 226, 1901ApJ....13..226P
Plaskett, J. S., 1928, PDAO, 4, 119, 1928PDAO....4..119P
Schmid, H. M., Schild, H., 1997, A&A, 327, 219, 1997A&A...327..219S
Skopal, A., Pribulla, T., 2006, ATel, 882, 1, 2006ATel..882....1S
Skopal, A., Tarasova, T. N., Wolf, M. et al., 2018, ApJ, 858, 2, 120, 2018ApJ...858..120S
Skopal, A., Vittone, A. A., Errico, L. et al., 2006, A&A, 453, 1, 279, 2006A&A...453..279S
Skopal, A., 2005, A&A, 440, 3, 995, 2005A&A...440..995S
Sokoloski, J. L., Bildsten, L., 1999, ApJ, 517, 2, 919, 1999ApJ...517..919S
Sokoloski, J. L., Kenyon, S. J., Espey, B. R. et al., 2006, ApJ, 636, 2, 1002, 2006ApJ...636.1002S
Swings, P., Struve, O., 1941, ApJ, 93, 356, 1941ApJ....93..356S
Tomov, N. A., Taranova, O. G., Tomova, M. T., 2003, A&A, 401, 669, 2003A&A...401..669T