AG Dra

Constellation
Draco

Equatorial coordinates
α = 16 01 40.993
δ = +66 48 10.041

Galactic coordinates
l = 100.2877°
b = 40.9712°

Suspected	1943^Ref
Confirmed	1954^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref - Z And^Ref

Identifiers

AG Dra	IRAS 16013+6656	GSC2.4.2 N4MH000215	AAVSO 000-BBW-893
SIMBAD V* AG Dra	Pan-STARRS 188162404210144368	SAO 16931	VSX 13733
GAIA DR3 1642955252784454144	SkyMapper -	WRAY -	GCVS AG Dra
2MASS J16014101+6648101	HIP 78512	Hen -	BD +67 922
WISE J160141.01+664810.0	TYC 4195-254-1	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	+67 922 (Conf.)	Allen (1984)	AG Dra (Conf.)	Belzcyński et al. (2001)	AG Dra (Conf.)
Gaposchkin (1957)	+67° 922 (Conf.)	Kenyon (1986)	AG Dra (Conf.)	Akras et al. (2019)	AG Dra (Conf.)
Boyarchuk (1969)	AG Dra (Conf.)	Vaidis (1988, 1991)	AG Dra (Conf.)

Position

Right ascension (°)	240.4208^Ref	Parallax (mas)	0.341±0.015^Ref	Reddening E(B-V) (mag)	0.04±0.0^Ref ^{, Note}
Declination (°)	66.8028^Ref	Distance (kpc)	0.7^Ref, 2.5^Ref, 1.1^Ref, 1.543^Ref 2.73^Ref ^{, Note}, 2.79^Ref ^{, Note}
Galactic longitude (°)	100.2877^Ref	Proper motion in α (mas/yr)	-6.93±0.02^Ref
Galactic latitude (°)	40.9712^Ref	Proper motion in δ (mas/yr)	-5.85±0.02^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	α^Ref	J (mag)	7.15^Ref	Flickering	No^Ref
GALEX FUV (mag)	11.99^Ref	H (mag)	6.37^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	12.64^Ref	K (mag)	6.21^Ref	Outburst type	Z And^Ref
IUE	Yes^Ref	WISE W1 (mag)	6.08^Ref	Jets	Yes?^Ref
FUSE	Yes^Ref	WISE W2 (mag)	5.96^Ref	Resolved nebula	No^Ref
U (mag)	11.50^Ref	WISE W3 (mag)	5.67^Ref	IPmax (eV)	114^Ref, 205.3^Ref
B (mag)	11.20^Ref	WISE W4 (mag)	5.01^Ref	[O III] lines	No^Ref
V (mag)	9.74^Ref	IRAS 12μm (Jy)	0.22^Ref	He II lines	Yes^Ref
R (mag)	8.52^Ref	IRAS 25μm (Jy)	0.74^Ref	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	0.40^Ref	O VI lines	Yes^Ref
BP (mag)	9.92^Ref	IRAS 100μm (Jy)	1.05^Ref
G (mag)	9.17^Ref	AKARI S09 (Jy)	0.37^Ref
RP (mag)	8.31^Ref	AKARI S18 (Jy)	0.16^Ref

Orbit

Orbital period (days)	554^Ref, 547±10^Ref, 549±7^Ref, 549.73±1.59^Ref, 548.65±0.97^Ref	γ velocity (km/h)	-148.3±0.3^Ref, -147.3±0.4^Ref, -147.42±0.13^Ref, -147.22±0.19^Ref, -146.36±1.24^Ref	Size of giant’s orbit (AU)	0.26^Ref, 0.22^Ref, 0.235^Ref, 0.295^Ref
Eccentricity	0^Ref, 0.006^Ref, 0^Ref	RV of giant (km/h)	5.1±0.5^Ref, 4.5±0.6^Ref, 4.67±0.20^Ref, 5.86±0.3^Ref	Separation (AU)	-
Inclination (°)	30-45^Ref, 105-135^Ref	Inferior conj. of giant (JD)	2453122	Mass function	0.0076^Ref, 0.005^Ref, 0.00579^Ref, 0.0115^Ref
Eclipses	No^Ref			Mass ratio	2-4^Ref
Orbital ephemeris	Min (U) = 2443629.17±2.30 + 549.73±1.59 x E^Ref

Cool component

Spectral type	K3 III^Ref, K2 III^Ref	Mass (M_⊙)	1-1.5^Ref, 1.18^Ref	Pulsation	Yes?^Ref
Eff. temperature (K)	4000^Ref, 4300±100^Ref, 4300^Ref	Radius (R_⊙)	33±11^Ref, 34±4^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	1500^Ref, 210-320^Ref, 360^Ref, 360±90^Ref	Pulsation period (days)	355.27±1.82^Ref
Metallicity [Fe/H]	-1.3^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	0.5-0.6^Ref, 0.17-0.52^Ref, 0.4^Ref	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.068^Ref, 0.009-0.010^Ref, 0.08±0.01^Ref, 0.03±0.002^Ref	Accretion disk	-
Eff. temperature (K)	97000^Ref, 105000-130000^Ref, 80000-150000^Ref, 109600±5400^Ref, 110000^Ref, 80000±5000^Ref, 160000±5000^Ref	Luminosity (L_⊙)	370^Ref, 1000^Ref, 900±200^Ref, 153^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

Janssen & Vyssotsky (1943) detected strong emission lines and a red continuum in AG Dra. Subsequently, outburst activity of AG Dra was reported by Robinson (1964). Further investigations revealed the presence of two distinct types of outbursts—cool and hot—in AG Dra, as documented in González-Riestra et al. (1999).

References

Bastian, U., 1998, A&A, 329, L61, 1998A&A...329L..61B
Boyarchuk, A. A., 1966, Ap, 2, 1, 50, 1966Ap......2...50B
Fekel, F. C., Hinkle, K. H., Joyce, R. R. et al., 2000, AJ, 120, 6, 3255, 2000AJ....120.3255F
Friedjung, M., Gális, R., Hric, L. et al., 2003, A&A, 400, 595, 2003A&A...400..595F
Friedjung, M., Hric, L., Petrík, K. et al., 1998, A&A, 335, 545, 1998A&A...335..545F
González-Riestra, R., Viotti, R., Iijima, T. et al., 1999, A&A, 347, 478, 1999A&A...347..478G
Greiner, J., Bickert, K., Luthardt, R. et al., 1997, A&A, 322, 576, 1997A&A...322..576G
Gális, R., Hric, L., Friedjung, M. et al., 1999, A&A, 348, 533, 1999A&A...348..533G
Hric, L., Gális, R., Leedjärv, L. et al., 2014, MNRAS, 443, 2, 1103, 2014MNRAS.443.1103H
Iijima, T., Vittone, A., Chochol, D., 1987, A&A, 178, 203, 1987A&A...178..203I
Janssen, E. M., Vyssotsky, A. N., 1943, PASP, 55, 326, 244, 1943PASP...55..244J
Leedjärv, L., Gális, R., Hric, L. et al., 2016, MNRAS, 456, 3, 2558, 2016MNRAS.456.2558L
Meinunger, L., 1979, IBVS, 1611, 1, 1979IBVS.1611....1M
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Mikołajewska, J., 2002, MNRAS, 335, 1, L33, 2002MNRAS.335L..33M
Munari, U., Siviero, A., Ochner, P. et al., 2009, PASP, 121, 884, 1070, 2009PASP..121.1070M
Robinson, L. J., 1964, IBVS, 73, 1, 1964IBVS...73....1R
Roman, N. G., 1953, ApJ, 117, 467, 1953ApJ...117..467R
Shore, S. N., Wahlgren, G. M., Genovali, K. et al., 2010, A&A, 510, A70, 2010A&A...510A..70S
Sion, E. M., Moreno, J., Godon, P. et al., 2012, AJ, 144, 6, 171, 2012AJ....144..171S
Skopal, A., 2005, A&A, 440, 3, 995, 2005A&A...440..995S
Smith, S. E., Bopp, B. W., 1981, MNRAS, 195, 733, 1981MNRAS.195..733S
Smith, V. V., Cunha, K., Jorissen, A. et al., 1996, A&A, 315, 179, 1996A&A...315..179S
Tomova, M. T., Tomov, N. A., 1999, A&A, 347, 151, 1999A&A...347..151T
Wilson, R. E., 1945, PASP, 57, 339, 309, 1945PASP...57..309W