Ap 1-9

CONFIRMED MILKY WAY

Constellation
Sagittarius

Equatorial coordinates
α = 18 10 28.924
δ = -28 07 41.077

Galactic coordinates
l = 3.4293°
b = -4.3274°

Suspected	1974^Ref
Confirmed	1984^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

Ap 1-9	IRAS 18073-2753	GSC2.4.2 S9TL034714	AAVSO 000-BJT-853
SIMBAD PN Ap 1-9	Pan-STARRS 74242726205526627	SAO -	VSX 241079
GAIA DR3 4050920382301202688	SkyMapper -	WRAY 16-377	GCVS -
2MASS J18102893-2807409	HIP -	Hen 2-356	BD -
WISE J181028.93-280741.0	TYC -	ESO 456-63	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	Ap 1-9 (Conf.)	Belzcyński et al. (2001)	Ap 1-9 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	Ap 1-9 (Conf.)	Akras et al. (2019)	Ap 1-9 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	Ap-1-9 (Conf.)

Position

Right ascension (°)	272.6205^Ref	Parallax (mas)	0.114±0.023^Ref	Reddening E(B-V) (mag)	0.56±0.02^Ref ^{, Note}
Declination (°)	-28.1281^Ref	Distance (kpc)	2.6^Ref, 2.5^Ref 7.56^Ref ^{, Note}, 7.50^Ref ^{, Note}
Galactic longitude (°)	3.4293^Ref	Proper motion in α (mas/yr)	-3.50±0.03^Ref
Galactic latitude (°)	-4.3274^Ref	Proper motion in δ (mas/yr)	-2.30±0.02^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	-	J (mag)	9.80^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	8.91^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	8.61^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	8.22^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	8.16^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	7.62^Ref	IPmax (eV)	54.4^Ref
B (mag)	14.40^Ref	WISE W4 (mag)	7.00^Ref	[O III] lines	Yes^Ref
V (mag)	13.17^Ref	IRAS 12μm (Jy)	-	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	-	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	-	O VI lines	No^Ref
BP (mag)	13.44^Ref	IRAS 100μm (Jy)	-
G (mag)	12.51^Ref	AKARI S09 (Jy)	-
RP (mag)	11.46^Ref	AKARI S18 (Jy)	-

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	K4 III^Ref, K5 III^Ref, K5 III^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	3976^Ref	Radius (R_⊙)	-	Type	-
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	-
Metallicity [Fe/H]	-			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	-	Luminosity (L_⊙)	200^Ref
Lower limit (K)	54000^Ref
Upper limit (K)	70000^Ref

Links

SIMBAD CDS Portal

Notes

Allen (1984) and Kaler et al. (1991) detected emission lines up to 35.1 eV, while Mikołajewska et al. (1997) reported the detection of He II as well.

References

Allen, D. A., Glass, I. S., 1974, MNRAS, 167, 337, 1974MNRAS.167..337A
Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Allen, D. A., 1984, PASA, 5, 3, 369, 1984PASA....5..369A
Kaler, J. B., Hayes, J., Bell, D. et al., 1991, PASP, 103, 561, 1991PASP..103..561K
Medina Tanco, G. A., Steiner, J. E., 1995, AJ, 109, 1770, 1995AJ....109.1770M
Mikołajewska, J., Acker, A., Stenholm, B., 1997, A&A, 327, 191, 1997A&A...327..191M
Webster, B. L., Allen, D. A., 1975, MNRAS, 171, 171, 1975MNRAS.171..171W

Last updated: April 18, 2022