Ap 1-8

CONFIRMED MILKY WAY

Constellation
Sagittarius

Equatorial coordinates
α = 18 04 29.623
δ = -28 21 34.814

Galactic coordinates
l = 2.5876°
b = -3.2845°

Suspected	1975^Ref
Confirmed	1978^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

Ap 1-8	IRAS 18013-2821	GSC2.4.2 S9SO066745	AAVSO 000-BJT-848
SIMBAD OGLE BLG-LPV-199350	Pan-STARRS 73962711235018665	SAO -	VSX 241069
GAIA DR3 4062456561377068032	SkyMapper -	WRAY -	GCVS -
2MASS J18042963-2821347	HIP -	Hen -	BD -
WISE J180429.62-282134.7	TYC -	ESO 456-47	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	Ap 1-8 (Conf.)	Belzcyński et al. (2001)	Ap 1-8 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	Ap 1-8 (Conf.)	Akras et al. (2019)	Ap 1-8 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	Ap-1-8 (Conf.)

Position

Right ascension (°)	271.1234^Ref	Parallax (mas)	0.141±0.033^Ref	Reddening E(B-V) (mag)	0.71±0.02^Ref ^{, Note}
Declination (°)	-28.3597^Ref	Distance (kpc)	10^Ref, 5.3^Ref 5.71^Ref ^{, Note}, 5.03^Ref ^{, Note}
Galactic longitude (°)	2.5876^Ref	Proper motion in α (mas/yr)	-1.20±0.04^Ref
Galactic latitude (°)	-3.2845^Ref	Proper motion in δ (mas/yr)	-4.88±0.03^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	-	J (mag)	9.35^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	8.31^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	7.90^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	7.71^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.76^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	7.18^Ref	IPmax (eV)	114^Ref
B (mag)	-	WISE W4 (mag)	5.56^Ref	[O III] lines	Yes^Ref
V (mag)	-	IRAS 12μm (Jy)	0.84^Ref	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	0.63^Ref	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	3.20^Ref	O VI lines	Yes^Ref
BP (mag)	14.53^Ref	IRAS 100μm (Jy)	34.90^Ref
G (mag)	13.00^Ref	AKARI S09 (Jy)	-
RP (mag)	11.72^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	957±97^Ref	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	Min (B) = 2448973 + 957±97 x E^Ref

Cool component

Spectral type	M0 III^Ref, M2 III^Ref, M4 III^Ref	Mass (M_⊙)	-	Pulsation	Yes^Ref
Eff. temperature (K)	3720^Ref	Radius (R_⊙)	-	Type	SR^Ref
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	62±1^Ref
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_⊙)	570^Ref
Lower limit (K)	114000^Ref
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

Potential photometric variability was noted in MACHO data (Lutz et al., 2010) and further analyzed by Gromadzki et al. (2013). The coordinates provided in SIMBAD (Wenger et al., 2000) are incorrect.

References

Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Allen, D. A., 1984, PASA, 5, 3, 369, 1984PASA....5..369A
Gromadzki, M., Mikołajewska, J., Soszyński, I., 2013, AcA, 63, 4, 405, 2013AcA....63..405G
Lutz, J. H., Fraser, O., McKeever, J. et al., 2010, PASP, 122, 891, 524, 2010PASP..122..524L
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
Wenger, M., Ochsenbein, F., Egret, D. et al., 2000, A&AS, 143, 9, 2000A&AS..143....9W

Last updated: April 18, 2022