New Online Database of Symbiotic Variables: OY Cyg

Constellation
Cygnus

Equatorial coordinates
α = 19 54 43.853
δ = +39 17 57.717

Galactic coordinates
l = 74.4841°
b = 5.7976°

Suspected	1975^Ref
Confirmed	-
Symbiotic IR type	S?^Ref
Hot component type	accreting-only?^Ref
Outbursts	-

Identifiers

OY Cyg	IRAS 19529+3910	GSC2.4.2 N2J1000047	AAVSO 000-BDN-400
SIMBAD V* OY Cyg	Pan-STARRS 155152986827239847	SAO -	VSX 11232
GAIA DR3 2073388835032529536	SkyMapper -	WRAY -	GCVS OY Cyg
2MASS J19544385+3917579	HIP -	Hen -	BD -
WISE J195443.84+391757.7	TYC -	ESO -	HD -

Symbiotic Catalogs

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

Position

Right ascension (°)	298.6827^Ref	Parallax (mas)	0.224±0.032^Ref	Reddening E(B-V) (mag)	0.34±0.03^Ref ^{, Note}
Declination (°)	39.2994^Ref	Distance (kpc)	3.68^Ref ^{, Note}, 3.73^Ref ^{, Note}
Galactic longitude (°)	74.4841^Ref	Proper motion in α (mas/yr)	-1.55±0.03^Ref
Galactic latitude (°)	5.7976^Ref	Proper motion in δ (mas/yr)	-3.54±0.04^Ref

Observations

X-Ray	-	IR type	S?^Ref	Radio	-
X-Ray type	-	J (mag)	6.53^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	5.50^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	5.08^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	5.09^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	4.90^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	3.88^Ref	IPmax (eV)	-
B (mag)	16.03^Ref	WISE W4 (mag)	2.89^Ref	[O III] lines	-
V (mag)	13.16^Ref	IRAS 12μm (Jy)	1.25^Ref	He II lines	-
R (mag)	-	IRAS 25μm (Jy)	0.71^Ref	[Fe VII] lines	-
I (mag)	-	IRAS 60μm (Jy)	2.80^Ref	O VI lines	-
BP (mag)	13.41^Ref	IRAS 100μm (Jy)	10.70^Ref
G (mag)	10.59^Ref	AKARI S09 (Jy)	1.21^Ref
RP (mag)	9.18^Ref	AKARI S18 (Jy)	0.70^Ref

Orbit

Orbital period (days)	-	γ velocity (km/h)	11.01±0.43^Ref	Size of giant’s orbit (AU)	-
Eccentricity	-	RV of giant (km/h)	-	Separation (AU)	-
Inclination (°)	-	Inferior conj. of giant (JD)	-	Mass function	-
Eclipses	-			Mass ratio	-
Orbital ephemeris	-

Cool component

Spectral type	M2-4^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	-
IR type	S?^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	-
Metallicity [Fe/H]	-			Pulsation ephemeris	-

Hot component

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

Links

SIMBAD CDS Portal

Notes

Listed as a possible symbiotic star or closely related object in Munari & Zwitter (2002), and as confirmed symbiotic star in the catalog of Akras et al. (2019). There are no visible emission lines in the spectrum. Initially mentioned in Hoffleit (1975) under the name OX Cyg. However, the studied star was subsequently identified as OY Cyg (Kazarovets & Samus, 1998).

References

Akras, S., Guzman-Ramirez, L., Leal-Ferreira, M. L. et al., 2019, ApJS, 240, 2, 21, 2019ApJS..240...21A
Hoffleit, D., 1975, IBVS, 1063, 1, 1975IBVS.1063....1H
Kazarovets, E. V., Samus, N. N., 1998, IBVS, 4584, 1, 1998IBVS.4584....1K
Munari, U., Zwitter, T., 2002, A&A, 383, 188, 2002A&A...383..188M

OY Cyg