Z Andromedae information

Z Andromedae
Observation data; Epoch J2000 Equinox J2000
Constellation	Andromeda
Right ascension	23h 33m 39.9551s
Declination	+48° 49′ 05.974″
Apparent magnitude (V)	7.7 - 11.3
Characteristics
Spectral type	M2III + B1eq
U−B color index	−0.49
B−V color index	+1.35
Variable type	Z And
Astrometry
Radial velocity (Rv)	-0.59 km/s
Proper motion (μ)	RA: -1.606 ± 0.049 mas/yr ; Dec.: -2.971 ± 0.040 mas/yr
Parallax (π)	0.5123 ± 0.0300 mas
Distance	6,400 ± 400 ly ; (2,000 ± 100 pc)
Orbit
Period (P)	759.0±1.9 days
Eccentricity (e)	0.0
Inclination (i)	47±12°
Semi-amplitude (K1); (primary)	6.73±0.22 km/s
Details
Red giant
Mass	2 M☉
Radius	85 R☉
Luminosity	880 L☉
Temperature	3,400 K
White dwarf
Mass	0.75 M☉
Radius	0.17 - 0.36 R☉
Luminosity	1,500 - 9,800 L☉
Temperature	90,000 - 150,000 K
Rotation	1682.6 ± 0.6 s
Other designations
	MWC 416, HD 221650, HIP 116287, SAO 53146, PPM 64386, AG+48° 2087, GCRV 14773, IRAS 23312+4832, HV 193, AN 41.1901, JP11 3636, TYC 3645-2066-1, BD+48° 4093, GSC 03645-02066, 2MASS J23333994+4849059, AAVSO 2328+48, 2E 2331.6+4834, PLX 5697, 2E 4735
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue,; CCDM (2002),; Bright Star Catalogue (5th rev. ed.)

Z Andromedae is a binary star system consisting of a red giant and a white dwarf. It is the prototype of a type of cataclysmic variable star known as symbiotic variable stars or simply Z Andromedae variables. The brightness of those stars vary over time, showing a quiescent, more stable phase and then an active one with a more pronounced variability and stronger brightening and/or dimming.^[11]

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^ ^a ^b ^c Cite error: The named reference shenavrin was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference ibvs was invoked but never defined (see the help page).
^ Cite error: The named reference rv was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference fekel was invoked but never defined (see the help page).
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^ ^a ^b ^c Cite error: The named reference sokoloski2006 was invoked but never defined (see the help page).
^ Cite error: The named reference Sokoloski1999 was invoked but never defined (see the help page).
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[GaiaDR2-1] Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).

[gcvs-2] Cite error: The named reference gcvs was invoked but never defined (see the help page).

[shenavrin-3] Cite error: The named reference shenavrin was invoked but never defined (see the help page).

[ibvs-4] Cite error: The named reference ibvs was invoked but never defined (see the help page).

[rv-5] Cite error: The named reference rv was invoked but never defined (see the help page).

[fekel-6] Cite error: The named reference fekel was invoked but never defined (see the help page).

[leibowitz-7] Cite error: The named reference leibowitz was invoked but never defined (see the help page).

[skopal2003-8] Cite error: The named reference skopal2003 was invoked but never defined (see the help page).

[sokoloski2006-9] Cite error: The named reference sokoloski2006 was invoked but never defined (see the help page).

[Sokoloski1999-10] Cite error: The named reference Sokoloski1999 was invoked but never defined (see the help page).

[daviddarling-11] Cite error: The named reference daviddarling was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
Constellation	Andromeda
Right ascension	23^h 33^m 39.9551^s^[1]
Declination	+48° 49′ 05.974″^[1]
Apparent magnitude (V)	7.7 - 11.3^[2]
Characteristics
Spectral type	M2III + B1eq^[3]
U−B color index	−0.49^[4]
B−V color index	+1.35^[4]
Variable type	Z And^[2]
Astrometry

Radial velocity (R_v)	-0.59^[5] km/s
Proper motion (μ)	RA: -1.606 ± 0.049^[1] mas/yr Dec.: -2.971 ± 0.040^[1] mas/yr
Parallax (π)	0.5123 ± 0.0300 mas^[1]
Distance	6,400 ± 400 ly (2,000 ± 100 pc)

Orbit
Period (P)	759.0±1.9^[6] days
Eccentricity (e)	0.0^[6]
Inclination (i)	47±12^[7]°
Semi-amplitude (K₁) (primary)	6.73±0.22^[6] km/s
Details
Red giant
Mass	2^[6] `M`_☉
Radius	85^[3] `R`_☉
Luminosity	880^[8] `L`_☉
Temperature	3,400^[3] K
White dwarf
Mass	0.75^[6] `M`_☉
Radius	0.17 - 0.36^[9] `R`_☉
Luminosity	1,500 - 9,800^[9] `L`_☉
Temperature	90,000 - 150,000^[9] K
Rotation	1682.6 ± 0.6 s^[10]
Other designations
MWC 416, HD 221650, HIP 116287, SAO 53146, PPM 64386, AG+48° 2087, GCRV 14773, IRAS 23312+4832, HV 193, AN 41.1901, JP11 3636, TYC 3645-2066-1, BD+48° 4093, GSC 03645-02066, 2MASS J23333994+4849059, AAVSO 2328+48, 2E 2331.6+4834, PLX 5697, 2E 4735
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

Z Andromedae information

and 28 Related for: Z Andromedae information

Z Andromedae

Symbiotic binary

Variable star

List of white dwarfs

List of astronomy acronyms

4 Draconis

Cataclysmic variable star

Outline of astronomy

Sunda thrush

List of stars in Sagitta

R Aquarii

SY Muscae

CH Cygni

EG Andromedae

List of smallest known stars

AG Draconis

Rapidly oscillating Ap star

DD Microscopii

List of variable stars

IW Andromedae

Andromeda Galaxy

List of stars in Triangulum Australe

Marie Bloch

List of stars in Corona Australis

List of stars in Musca

Honores Friderici

RX Andromedae

Omicron Andromedae