BF Cyg

Constellation
Cygnus

Equatorial coordinates
α = 19 23 53.498
δ = +29 40 29.084

Galactic coordinates
l = 62.9277°
b = 6.6967°

Suspected	1943^Ref
Confirmed	1952^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref - SyN + Z And?^Ref

Identifiers

BF Cyg	IRAS -	GSC2.4.2 N248001211	AAVSO 000-BCG-634
SIMBAD V* BF Cyg	Pan-STARRS 143612909730940338	SAO -	VSX 11004
GAIA DR3 2038568676176360192	SkyMapper -	WRAY -	GCVS BF Cyg
2MASS J19235351+2940292	HIP -	Hen 3-1747	BD -
WISE J192353.49+294029.2	TYC 2137-234-1	ESO -	HD -

Symbiotic Catalogs

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

Position

Right ascension (°)	290.9729^Ref	Parallax (mas)	0.194±0.019^Ref	Reddening E(B-V) (mag)	0.24±0.01^Ref ^{, Note}
Declination (°)	29.6747^Ref	Distance (kpc)	2^Ref, 4.6-5.4^Ref, 3.8^Ref 4.62^Ref ^{, Note}, 4.65^Ref ^{, Note}
Galactic longitude (°)	62.9277^Ref	Proper motion in α (mas/yr)	-1.74±0.02^Ref
Galactic latitude (°)	6.6967^Ref	Proper motion in δ (mas/yr)	-5.79±0.02^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	7.57^Ref	Flickering	Yes^Ref
GALEX FUV (mag)	-	H (mag)	6.61^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	-	K (mag)	6.27^Ref	Outburst type	SyN + Z And?^Ref
IUE	Yes^Ref	WISE W1 (mag)	5.89^Ref	Jets	Yes^Ref
FUSE	Yes^Ref	WISE W2 (mag)	5.80^Ref	Resolved nebula	No^Ref
U (mag)	-	WISE W3 (mag)	5.48^Ref	IPmax (eV)	97.1 (UV)^Ref, 35.1^Ref
B (mag)	10.69^Ref	WISE W4 (mag)	5.02^Ref	[O III] lines	Yes^Ref
V (mag)	10.04^Ref	IRAS 12μm (Jy)	-	He II lines	No^Ref
R (mag)	-	IRAS 25μm (Jy)	-	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	-	O VI lines	No^Ref
BP (mag)	10.25^Ref	IRAS 100μm (Jy)	-
G (mag)	9.67^Ref	AKARI S09 (Jy)	0.40^Ref
RP (mag)	8.86^Ref	AKARI S18 (Jy)	0.16^Ref

Orbit

Orbital period (days)	756.8±0.7^Ref, 757.2±3.9^Ref	γ velocity (km/h)	-3.75±0.14^Ref	Size of giant’s orbit (AU)	0.467^Ref
Eccentricity	0^Ref	RV of giant (km/h)	6.72±0.24^Ref	Separation (AU)	-
Inclination (°)	70-90^Ref	Inferior conj. of giant (JD)	2451584.4	Mass function	0.2390.0239^Ref
Eclipses	Yes^Ref			Mass ratio	1-2^Ref, 3.6^Ref
Orbital ephemeris	Min (V) = 2415058±12- + 756.8±0.7 x E^Ref

Cool component

Spectral type	M5 III^Ref	Mass (M_⊙)	1^Ref, 2^Ref, 2.2^Ref	Pulsation	-
Eff. temperature (K)	3400^Ref	Radius (R_⊙)	240-280^Ref, 150^Ref, 70^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	500^Ref, 5000^Ref, 2700^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-0.25±0.07^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	0.3-0.4^Ref, 0.6^Ref	Spin period (min)	108.36^Ref
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.79^Ref	Accretion disk	-
Eff. temperature (K)	60000^Ref, 60000^Ref, 55000^Ref, 60000^Ref, 95000^Ref	Luminosity (L_⊙)	1000^Ref, 5200^Ref, 7000^Ref, 7000^Ref, 9600^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

References

Aller, L. H., 1952, PASP, 64, 380, 228, 1952PASP...64..228A
Aller, L. H., 1953, PDAO, 9, 321, 1953PDAO....9..321A
Cassatella, A., Fernandez-Castro, T., González-Riestra, R. et al., 1992, A&A, 258, 368, 1992A&A...258..368C
Fernandez-Castro, T., González-Riestra, R., Cassatella, A. et al., 1990, A&A, 227, 422, 1990A&A...227..422F
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2023, MNRAS, 526, 1, 918, 2023MNRAS.526..918G
González-Riestra, R., Cassatella, A., Fernandez-Castro, T., 1990, A&A, 237, 385, 1990A&A...237..385G
McKeever, J., Lutz, J. H., Wallerstein, G. et al., 2011, PASP, 123, 907, 1062, 2011PASP..123.1062M
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Merrill, P. W., Burwell, C. G., 1933, ApJ, 78, 87, 1933ApJ....78...87M
Merrill, P. W., 1943, ApJ, 98, 334, 1943ApJ....98..334M
Merrill, P. W., 1944, ApJ, 99, 15, 1944ApJ....99...15M
Merrill, P. W., 1950, ApJ, 111, 484, 1950ApJ...111..484M
Mikołajewska, J., Kenyon, S. J., Mikołajewski, M., 1989, AJ, 98, 1427, 1989AJ.....98.1427M
Pereira, C. B., Landaberry, S. J. C., 1996, AJ, 111, 1329, 1996AJ....111.1329P
Shchurova, A., Skopal, A., Shugarov, S. Y. et al., 2019, CoSka, 49, 2, 411, 2019CoSka..49..411S
Siviero, A., Tamajo, E., Lutz, J. et al., 2012, BaltA, 21, 188, 2012BaltA..21..188S
Skopal, A., Tomov, N. A., Tomova, M. T., 2013, A&A, 551, L10, 2013A&A...551L..10S
Skopal, A., Vittone, A., Errico, L. et al., 1997, MNRAS, 292, 3, 703, 1997MNRAS.292..703S
Skopal, A., 2005, A&A, 440, 3, 995, 2005A&A...440..995S
Tomov, N. A., Tomova, M. T., Bisikalo, D. V., 2019, BlgAJ, 30, 60, 2019BlgAJ..30...60T

BF Cyg

Identifiers

Symbiotic Catalogs

Position

Observations

Orbit

Cool component

Hot component

Links

Notes

References

Last updated: January 12, 2024