CI Cyg

Constellation
Cygnus

Equatorial coordinates
α = 19 50 11.830
δ = +35 41 02.959

Galactic coordinates
l = 70.8963°
b = 4.7420°

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

Identifiers

CI Cyg	IRAS 19483+3533	GSC2.4.2 N2FW001083	AAVSO 000-BCJ-172
SIMBAD V* CI Cyg	Pan-STARRS 150822975494761356	SAO -	VSX 11030
GAIA DR3 2047647756007944576	SkyMapper -	WRAY -	GCVS CI Cyg
2MASS J19501182+3541029	HIP 97594	Hen 3-1784	BD -
WISE J195011.82+354103.0	TYC 2681-154-1	ESO -	HD -

Symbiotic Catalogs

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

Position

Right ascension (°)	297.5493^Ref	Parallax (mas)	0.476±0.025^Ref	Reddening E(B-V) (mag)	0.44±0.03^Ref ^{, Note}
Declination (°)	35.6842^Ref	Distance (kpc)	2-2.6^Ref, 2^Ref, 2^Ref 1.94^Ref ^{, Note}, 1.86^Ref ^{, Note}
Galactic longitude (°)	70.8963^Ref	Proper motion in α (mas/yr)	-2.96±0.03^Ref
Galactic latitude (°)	4.7420^Ref	Proper motion in δ (mas/yr)	-2.88±0.03^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	5.76^Ref	Flickering	No^Ref
GALEX FUV (mag)	-	H (mag)	4.76^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	-	K (mag)	4.41^Ref	Outburst type	Z And^Ref
IUE	Yes^Ref	WISE W1 (mag)	4.29^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	4.07^Ref	Resolved nebula	No^Ref
U (mag)	-	WISE W3 (mag)	4.01^Ref	IPmax (eV)	99.0^Ref, 109.3 (UV)^Ref
B (mag)	12.13^Ref	WISE W4 (mag)	3.57^Ref	[O III] lines	Yes^Ref
V (mag)	10.93^Ref	IRAS 12μm (Jy)	0.93^Ref	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	0.33^Ref	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	0.45^Ref	O VI lines	No^Ref
BP (mag)	10.87^Ref	IRAS 100μm (Jy)	5.97^Ref
G (mag)	9.20^Ref	AKARI S09 (Jy)	1.22^Ref
RP (mag)	7.90^Ref	AKARI S18 (Jy)	0.41^Ref

Orbit

Orbital period (days)	855.6^Ref, 853.8±2.9^Ref	γ velocity (km/h)	18.3±0.4^Ref, 14.96±0.23^Ref, 9.17±2.48^Ref	Size of giant’s orbit (AU)	0.544^Ref, 0.523^Ref
Eccentricity	0.15±0.08^Ref, 0.109±0.048^Ref	RV of giant (km/h)	7±0.5^Ref, 6.7±0.3^Ref	Separation (AU)	-
Inclination (°)	>86^Ref, 73±6^Ref	Inferior conj. of giant (JD)	2445323.8,2450426.4	Mass function	0.029^Ref, 0.0262^Ref
Eclipses	Yes^Ref			Mass ratio	3^Ref, 3^Ref
Orbital ephemeris	Min (B) = 2442687.1 + 855.6 x E^Ref

Cool component

Spectral type	M4 III^Ref, M4.9 III^Ref, M5 III^Ref, M5.5 III^Ref	Mass (M_⊙)	2.4±0.6^Ref, 1.5^Ref, 1.3±0.3^Ref	Pulsation	-
Eff. temperature (K)	3300^Ref	Radius (R_⊙)	250±30^Ref, 240±20^Ref, 180^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	4200-7000^Ref, 4500^Ref, 3400^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-0.1±0.07^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	0.5^Ref, 0.43±0.04^Ref	Spin period (min)	66.6?^Ref
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.06-0.08^Ref, 0.006^Ref	Accretion disk	-
Eff. temperature (K)	130000^Ref, 156000±5000^Ref, 90000-155000^Ref, 125000^Ref, 115000^Ref, 115000^Ref	Luminosity (L_⊙)	760-2200^Ref, 560^Ref, 1700^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

Swings & Struve (1940) indicated a possible detection of the coronal [Fe X] line.

References

Chochol, D., Vittone, A., Milano, L. et al., 1984, A&A, 140, 91, 1984A&A...140...91C
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2023, MNRAS, 526, 1, 918, 2023MNRAS.526..918G
Iijima, T., 1982, A&A, 116, 210, 1982A&A...116..210I
Kenyon, S. J., Oliversen, N. A., Mikołajewska, J. et al., 1991, AJ, 101, 637, 1991AJ....101..637K
Kenyon, S. J., Webbink, R. F., Gallagher, J. S. et al., 1982, A&A, 106, 109, 1982A&A...106..109K
Luna, G. J. M., Sokoloski, J. L., Mukai, K. et al., 2013, A&A, 559, A6, 2013A&A...559A...6L
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Merrill, P. W., Humason, M. L., 1932, PASP, 44, 257, 56, 1932PASP...44...56M
Merrill, P. W., 1944, ApJ, 99, 15, 1944ApJ....99...15M
Merrill, P. W., 1950, ApJ, 111, 484, 1950ApJ...111..484M
Mikołajewska, J., Friedjung, M., Quiroga, C., 2006, A&A, 460, 1, 191, 2006A&A...460..191M
Mikołajewska, J., Mikołajewski, M., 1983, AcA, 33, 403, 1983AcA....33..403M
Mikołajewska, J., 1985, AcA, 35, 65, 1985AcA....35...65M
Mürset, U., Nussbaumer, H., Schmid, H. M. et al., 1991, A&A, 248, 458, 1991A&A...248..458M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Pucinskas, A., 1972, VilOB, 33, 50, 1972VilOB..33...50P
Siviero, A., Munari, U., Dallaporta, S. et al., 2009, MNRAS, 399, 4, 2139, 2009MNRAS.399.2139S
Skopal, A., 2005, A&A, 440, 3, 995, 2005A&A...440..995S
Stencel, R. E., Boiarchuk, A. A., Michalitsianos, A. G. et al., 1982, ApJL, 253, L77, 1982ApJ...253L..77S
Swings, P., Struve, O., 1940, ApJ, 91, 546, 1940ApJ....91..546S
Teyssier, F., 2011, JAVSO, 39, 1, 41, 2011JAVSO..39...41T