New Online Database of Symbiotic Variables: SU Lyn

Constellation
Lynx

Equatorial coordinates
α = 06 42 55.139
δ = +55 28 27.217

Galactic coordinates
l = 160.2560°
b = 20.9116°

Suspected	2016^Ref
Confirmed	2016^Ref
Symbiotic IR type	S^Ref
Hot component type	accreting-only^Ref
Outbursts	-

Identifiers

SU Lyn	IRAS 06387+5531	GSC2.4.2 N7H0016902	AAVSO 000-BDT-456
SIMBAD V* SU Lyn	Pan-STARRS 174561007299049806	SAO 25893	VSX 17917
GAIA DR3 994896502305377920	SkyMapper -	WRAY -	GCVS SU Lyn
2MASS J06425515+5528272	HIP -	Hen -	BD +55 1109
WISE J064255.17+552827.0	TYC 3770-1789-1	ESO -	HD 47648

Symbiotic Catalogs

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

Position

Right ascension (°)	100.7297^Ref	Parallax (mas)	1.373±0.063^Ref	Reddening E(B-V) (mag)	0.05±0.0^Ref ^{, Note}
Declination (°)	55.4742^Ref	Distance (kpc)	0.64^Ref 0.72^Ref ^{, Note}, 0.71^Ref ^{, Note}
Galactic longitude (°)	160.2560^Ref	Proper motion in α (mas/yr)	0.64±0.05^Ref
Galactic latitude (°)	20.9116^Ref	Proper motion in δ (mas/yr)	-1.05±0.04^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	δ^Ref	J (mag)	2.98^Ref	Flickering	Yes^Ref
GALEX FUV (mag)	16.38^Ref	H (mag)	1.92^Ref	Outbursts	-
GALEX NUV (mag)	16.06^Ref	K (mag)	1.62^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	-1.40^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	-0.68^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	0.74^Ref	IPmax (eV)	35.1^Ref, 77.5 (UV)^Ref
B (mag)	9.97^Ref	WISE W4 (mag)	0.60^Ref	[O III] lines	Yes^Ref
V (mag)	8.46^Ref	IRAS 12μm (Jy)	21.90^Ref	He II lines	No^Ref
R (mag)	-	IRAS 25μm (Jy)	5.98^Ref	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	0.92^Ref	O VI lines	No^Ref
BP (mag)	8.37^Ref	IRAS 100μm (Jy)	1.00^Ref
G (mag)	6.31^Ref	AKARI S09 (Jy)	28.21^Ref
RP (mag)	4.93^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	-	γ velocity (km/h)	-24.46±0.46^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	3.27^Note
Orbital ephemeris	-

Cool component

Spectral type	M5.8 III^Ref	Mass (M_⊙)	2.78±0.63^Ref	Pulsation	Yes^Ref
Eff. temperature (K)	3200±100^Ref	Radius (R_⊙)	280±40^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	7700±1000^Ref	Pulsation period (days)	126^Ref
Metallicity [Fe/H]	-			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	0.76-0.87^Ref, 0.85^Ref	Spin period (min)	-
Shell-burning/Accreting-only	accreting-only^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	37000^Ref	Luminosity (L_⊙)	0.16-0.66^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

Discovered by Mukai et al. (2016), SU Lyn is identified as a red giant, an optical counterpart to a hard, thermal X-ray source. Variability in the ultraviolet, as well as variable Balmer lines, have been observed. SU Lyn is classified as an accreting-only symbiotic star, and UV spectroscopy was presented by Kumar et al. (2021). Flickering in the U band was also detected by Zamanov et al. (2023).

References

Iłkiewicz, K., Mikołajewska, J., Scaringi, S. et al., 2022, MNRAS, 510, 2, 2707, 2022MNRAS.510.2707I
Kippenhahn, R., 1955, AN, 282, 73, 1955AN....282...73K
Kumar, V., Srivastava, M. K., Banerjee, D. P. K. et al., 2021, MNRAS, 500, 1, L12, 2021MNRAS.500L..12K
Lopes de Oliveira, R., Sokoloski, J. L., Luna, G. J. M. et al., 2018, ApJ, 864, 1, 46, 2018ApJ...864...46L
Mukai, K., Luna, G. J. M., Cusumano, G. et al., 2016, MNRAS, 461, 1, L1, 2016MNRAS.461L...1M
Munari, U., Traven, G., Masetti, N. et al., 2021, MNRAS, 505, 4, 6121, 2021MNRAS.505.6121M
Zamanov, R. K., Kostov, A., Moyseev, M. et al., 2023, BlgAJ, 38, 83, 2023BlgAJ..38...83Z

SU Lyn