New Online Database of Symbiotic Variables: PN K4-18

Constellation
Aquila

Equatorial coordinates
α = 19 12 09.116
δ = +02 37 57.085

Galactic coordinates
l = 37.6432°
b = -3.3997°

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

Identifiers

PN K4-18	IRAS 19096+0232	GSC2.4.2 N1N0497017	AAVSO -
SIMBAD IRAS 19096+0232	Pan-STARRS 111152880378559538	SAO -	VSX 2323114
GAIA DR3 4268167941382881280	SkyMapper -	WRAY -	GCVS -
2MASS J19120911+0237569	HIP -	Hen -	BD -
WISE J191209.11+023756.9	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 (°)	288.0380^Ref	Parallax (mas)	-0.018±0.110^Ref	Reddening E(B-V) (mag)	0.77±0.04^Ref ^{, Note}
Declination (°)	2.6325^Ref	Distance (kpc)	7.46^Ref ^{, Note}, 3.72^Ref ^{, Note}
Galactic longitude (°)	37.6432^Ref	Proper motion in α (mas/yr)	-0.04±0.13^Ref
Galactic latitude (°)	-3.3997^Ref	Proper motion in δ (mas/yr)	-2.06±0.11^Ref

Observations

X-Ray	-	IR type	S?^Ref	Radio	-
X-Ray type	-	J (mag)	7.79^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	6.71^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	6.19^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	5.90^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	5.70^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	5.12^Ref	IPmax (eV)	-
B (mag)	-	WISE W4 (mag)	4.48^Ref	[O III] lines	-
V (mag)	14.91^Ref	IRAS 12μm (Jy)	0.50^Ref	He II lines	-
R (mag)	15.41^Ref	IRAS 25μm (Jy)	0.53^Ref	[Fe VII] lines	-
I (mag)	-	IRAS 60μm (Jy)	0.57^Ref	O VI lines	-
BP (mag)	16.22^Ref	IRAS 100μm (Jy)	7.10^Ref
G (mag)	12.46^Ref	AKARI S09 (Jy)	0.43^Ref
RP (mag)	10.95^Ref	AKARI S18 (Jy)	0.17^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	-	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	-	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	-	Luminosity (L_⊙)	-
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

This southern PN was suggested to have a continuum similar to symbiotic and VV Cep stars based on infrared photometry by Allen & Glass (1974). It was subsequently classified as an M-type star in Acker & Stenholm (1990) and later identified as a long-period variable in Mowlavi et al. (2018).

References

Acker, A., Stenholm, B., 1990, A&AS, 86, 219, 1990A&AS...86..219A
Allen, D. A., Glass, I. S., 1974, MNRAS, 167, 337, 1974MNRAS.167..337A
Mowlavi, N., Lecoeur-Taïbi, I., Lebzelter, T. et al., 2018, A&A, 618, A58, 2018A&A...618A..58M

PN K4-18