New Online Database of Symbiotic Variables: K 4-40

Constellation
Vulpecula

Equatorial coordinates
α = 19 54 15.097
δ = +24 57 51.648

Galactic coordinates
l = 62.1196°
b = -1.4857°

Suspected	1974^Ref
Confirmed	-
Symbiotic IR type	-
Hot component type	-
Outbursts	-

Identifiers

K 4-40	IRAS 19521+2449	GSC2.4.2 N32B304827	AAVSO -
SIMBAD IRAS 19521+2449	Pan-STARRS 137952985630248188	SAO -	VSX 70927
GAIA DR3 1834501620153695616	SkyMapper -	WRAY -	GCVS -
2MASS J19541509+2457517	HIP -	Hen -	BD -
WISE -	TYC -	ESO -	HD -

Symbiotic Catalogs

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

Position

Right ascension (°)	298.5629^Ref	Parallax (mas)	0.208±0.105^Ref	Reddening E(B-V) (mag)	2.11±0.12^Ref ^{, Note}
Declination (°)	24.9643^Ref	Distance (kpc)	4.55^Ref ^{, Note}, 2.84^Ref ^{, Note}
Galactic longitude (°)	62.1196^Ref	Proper motion in α (mas/yr)	1.86±0.07^Ref
Galactic latitude (°)	-1.4857^Ref	Proper motion in δ (mas/yr)	1.61±0.10^Ref

Observations

X-Ray	-	IR type	-	Radio	-
X-Ray type	-	J (mag)	6.56^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	5.34^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	4.57^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	-	Jets	-
FUSE	No^Ref	WISE W2 (mag)	-	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	-	IPmax (eV)	-
B (mag)	-	WISE W4 (mag)	-	[O III] lines	-
V (mag)	-	IRAS 12μm (Jy)	2.86^Ref	He II lines	-
R (mag)	-	IRAS 25μm (Jy)	1.42^Ref	[Fe VII] lines	-
I (mag)	-	IRAS 60μm (Jy)	0.73^Ref	O VI lines	-
BP (mag)	16.80^Ref	IRAS 100μm (Jy)	37.10^Ref
G (mag)	12.75^Ref	AKARI S09 (Jy)	3.40^Ref
RP (mag)	10.99^Ref	AKARI S18 (Jy)	1.69^Ref

Orbit

Orbital period (days)	-	γ velocity (km/h)	-	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	M5-7^Ref	Mass (M_⊙)	-	Pulsation	Yes^Ref
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	Mira^Ref
IR type	-	Luminosity (L_⊙)	-	Pulsation period (days)	293.6266601^Ref
Metallicity [Fe/H]	-			Pulsation ephemeris	-

Hot component

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

Links

SIMBAD CDS Portal

Notes

Classified as a symbiotic star candidate in the HASH Database of PNe (Parker et al., 2016), likely based on the study of Allen (1974). Additionally, it has been identified as a Mira variable (Woźniak et al., 2004).

References

Allen, D. A., 1974, MNRAS, 168, 1, 1974MNRAS.168....1A
Parker, Q. A., Bojičić, I. S., Frew, D. J., 2016, JPhCS, 728, 3, 032008, 2016JPhCS.728c2008P
Woźniak, P. R., Williams, S. J., Vestrand, W. T. et al., 2004, AJ, 128, 6, 2965, 2004AJ....128.2965W

K 4-40