EG And

Constellation
Andromeda

Equatorial coordinates
α = 00 44 37.199
δ = +40 40 45.457

Galactic coordinates
l = 121.5361°
b = -22.1740°

Suspected	1950^Ref
Confirmed	1950^Ref
Symbiotic IR type	S^Ref
Hot component type	accreting-only^Ref
Outbursts	-

Identifiers

EG And	IRAS 00418+4024	GSC2.4.2 NBVE000376	AAVSO 000-BBC-010
SIMBAD V* EG And	Pan-STARRS 156810111551735738	SAO 36618	VSX 151
GAIA DR3 369176289048301312	SkyMapper -	WRAY -	GCVS EG And
2MASS J00443718+4040456	HIP 3494	Hen -	BD +39 167
WISE J004437.20+404045.5	TYC 2801-1704-1	ESO -	HD 4174

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	EG And (Conf.)	Belzcyński et al. (2001)	EG And (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	EG And (Conf.)	Akras et al. (2019)	EG And (Conf.)
Boyarchuk (1969)	HD 4174 (Susp.)	Vaidis (1988, 1991)	EG And (Conf.)

Position

Right ascension (°)	11.1550^Ref	Parallax (mas)	1.645±0.034^Ref	Reddening E(B-V) (mag)	0.07±0.0^Ref ^{, Note}
Declination (°)	40.6793^Ref	Distance (kpc)	0.4±0.1^Ref, 0.59±0.092^Ref, 0.4±0.02^Ref 0.59^Ref ^{, Note}, 0.60^Ref ^{, Note}
Galactic longitude (°)	121.5361^Ref	Proper motion in α (mas/yr)	8.61±0.03^Ref
Galactic latitude (°)	-22.1740^Ref	Proper motion in δ (mas/yr)	-15.47±0.02^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	β^Ref, δ^Ref	J (mag)	3.82^Ref	Flickering	Yes^Ref
GALEX FUV (mag)	-	H (mag)	2.93^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	2.58^Ref	Outburst type	-
IUE	Yes^Ref	WISE W1 (mag)	1.11^Ref	Jets	-
FUSE	Yes^Ref	WISE W2 (mag)	1.39^Ref	Resolved nebula	No^Ref
U (mag)	10.54^Ref	WISE W3 (mag)	2.45^Ref	IPmax (eV)	40.1^Ref, 97.1^Ref, 114^Ref
B (mag)	8.93^Ref	WISE W4 (mag)	2.29^Ref	[O III] lines	No^Ref
V (mag)	7.22^Ref	IRAS 12μm (Jy)	4.42^Ref	He II lines	No^Ref
R (mag)	-	IRAS 25μm (Jy)	1.22^Ref	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	1.06^Ref	O VI lines	No^Ref
BP (mag)	7.44^Ref	IRAS 100μm (Jy)	3.62^Ref
G (mag)	6.29^Ref	AKARI S09 (Jy)	5.99^Ref
RP (mag)	5.21^Ref	AKARI S18 (Jy)	1.44^Ref

Orbit

Orbital period (days)	482.2±0.6^Ref, 481.1±0.4^Ref, 482.57±0.53^Ref, 483.3±1.3^Ref	γ velocity (km/h)	-94.8^Ref, -95.2±0.3^Ref, -95.00±0.16^Ref, -99.49±1.48^Ref	Size of giant’s orbit (AU)	0.327^Ref, 0.324^Ref, 0.323^Ref
Eccentricity	0.29±0.07^Ref, 0.14±0.08^Ref, 0^Ref, 0^Ref	RV of giant (km/h)	8.6^Ref, 6.35±0.43^Ref, 7.32±0.27^Ref, 7.34±0.07^Ref	Separation (AU)	-
Inclination (°)	<40^Ref, 78-90^Ref, 75^Ref	Inferior conj. of giant (JD)	2450803.8	Mass function	0.032^Ref, 0.011^Ref, 0.02^Ref, 0.0196^Ref, 0.019^Ref
Eclipses	Yes^Ref, No^Ref, No^Ref			Mass ratio	3.2-4.4^Ref
Orbital ephemeris	-

Cool component

Spectral type	M2 III^Ref, M2.4 III^Ref, M3 III^Ref	Mass (M_⊙)	1.46^Ref, 1.1-2.4^Ref	Pulsation	-
Eff. temperature (K)	3700±100^Ref, 3500±150^Ref	Radius (R_⊙)	75.2±10^Ref, 124^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	950±250^Ref, 2070^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-0.54±0.05^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	0.4±0.1^Ref, 0.35-0.55^Ref	Spin period (min)	-
Shell-burning/Accreting-only	accreting-only^Ref	Radius (R_⊙)	0.024^Ref, 0.003^Ref	Accretion disk	-
Eff. temperature (K)	20000-40000^Ref, 75000^Ref, 95000^Ref, 80000-95000^Ref	Luminosity (L_⊙)	16^Ref, 46^Ref, 60^Ref, 5-40^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

Suggested to have a magnetic field by Babcock (1950), although this was not confirmed by Slovak (1982). Variability with a period of 40.5 days was detected by Jarzębowski (1964). In Tempesti (1977), similar variability on the timescale of 40-80 days was observed. A period of 470 days was detected by Smith (1980). The UV spectrum shows emission lines such as C IV, He II, Mg II, N V, while the optical spectrum shows Balmer lines, He I, [O III], and [Ne III] (Oliversen et al., 1985). Faint O VI lines in the UV were detected by Crowley et al. (2008).

References

Babcock, H. W., 1950, PASP, 62, 368, 277, 1950PASP...62..277B
Crowley, C., Espey, B. R., Mccandliss, S. R., 2008, ApJ, 675, 1, 711, 2008ApJ...675..711C
Fekel, F. C., Joyce, R. R., Hinkle, K. H. et al., 2000, AJ, 119, 3, 1375, 2000AJ....119.1375F
Garcia, M. R., 1986, AJ, 91, 1400, 1986AJ.....91.1400G
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2023, MNRAS, 526, 1, 918, 2023MNRAS.526..918G
Jarzębowski, T., 1964, AcA, 14, 77, 1964AcA....14...77J
Kenyon, S. J., Fernandez-Castro, T., 1987, AJ, 93, 938, 1987AJ.....93..938K
Kenyon, S. J., Garcia, M. R., 2016, AJ, 152, 1, 1, 2016AJ....152....1K
Kolb, K., Miller, J., Sion, E. M. et al., 2004, AJ, 128, 4, 1790, 2004AJ....128.1790K
Luna, G. J. M., Sokoloski, J. L., Mukai, K. et al., 2013, A&A, 559, A6, 2013A&A...559A...6L
Munari, U., 1993, A&A, 273, 425, 1993A&A...273..425M
Mürset, U., Wolff, B., Jordan, S., 1997, A&A, 319, 201, 1997A&A...319..201M
Nuñez, N. E., Nelson, T., Mukai, K. et al., 2016, ApJ, 824, 1, 23, 2016ApJ...824...23N
Oliversen, N. A., Anderson, C. M., Stencel, R. E. et al., 1985, ApJ, 295, 620, 1985ApJ...295..620O
Sion, E. M., Godon, P., Mikołajewska, J. et al., 2017, AJ, 153, 4, 160, 2017AJ....153..160S
Skopal, A., Chochol, D., Vittone, A. A. et al., 1991, A&A, 245, 531, 1991A&A...245..531S
Skopal, A., Chochol, D., Vittone, A. et al., 1990, CoSka, 20, 113, 1990CoSka..20..113S
Skopal, A., 1997, A&A, 318, 53, 1997A&A...318...53S
Skopal, A., 2005, A&A, 440, 3, 995, 2005A&A...440..995S
Slovak, M. H., 1982, ApJ, 262, 282, 1982ApJ...262..282S
Smith, S. E., 1980, ApJ, 237, 831, 1980ApJ...237..831S
Sokoloski, J. L., Bildsten, L., Ho, W. C. G., 2001, MNRAS, 326, 2, 553, 2001MNRAS.326..553S
Stencel, R. E., Sahade, J., 1980, ApJ, 238, 929, 1980ApJ...238..929S
Tempesti, P., 1977, IBVS, 1291, 1, 1977IBVS.1291....1T
Vogel, M., 1993, A&A, 274, L21, 1993A&A...274L..21V
Wilson, R. E., Vaccaro, T. R., 1997, MNRAS, 291, 1, 54, 1997MNRAS.291...54W
Wilson, R. E., 1950, PASP, 62, 363, 14, 1950PASP...62...14W