AS 221

CONFIRMED MILKY WAY

Constellation
Scorpius

Equatorial coordinates
α = 17 12 12.859
δ = -32 37 46.805

Galactic coordinates
l = 352.9524°
b = 3.9330°

Suspected	1950^Ref
Confirmed	1978^Ref
Symbiotic IR type	S^Ref, D^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

AS 221	IRAS -	GSC2.4.2 S8GS312378	AAVSO 000-BJX-981
SIMBAD EM* AS 221	Pan-STARRS -	SAO -	VSX 46895
GAIA DR3 5979902864926562176	SkyMapper 171212.86-323746.6	WRAY 15-1637	GCVS -
2MASS J17121286-3237469	HIP -	Hen 3-1348	BD -
WISE J171212.85-323746.8	TYC -	ESO 392-4	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	AS 221 (Conf.)	Belzcyński et al. (2001)	AS 221 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	AS 221 (Conf.)	Akras et al. (2019)	AS 221 (Conf.)
Boyarchuk (1969)	MHa 276-12 (Susp.)	Vaidis (1988, 1991)	NSV 8271 (Conf.)

Position

Right ascension (°)	258.0536^Ref	Parallax (mas)	0.062±0.033^Ref	Reddening E(B-V) (mag)	0.94±0.01^Ref ^{, Note}
Declination (°)	-32.6297^Ref	Distance (kpc)	5^Ref, 4^Ref 7.39^Ref ^{, Note}, 7.29^Ref ^{, Note}
Galactic longitude (°)	352.9524^Ref	Proper motion in α (mas/yr)	-2.33±0.04^Ref
Galactic latitude (°)	3.9330^Ref	Proper motion in δ (mas/yr)	-3.60±0.03^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref, D^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	12.14^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	10.10^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	8.73^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	7.18^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.13^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	4.62^Ref	IPmax (eV)	114^Ref
B (mag)	-	WISE W4 (mag)	3.69^Ref	[O III] lines	Yes^Ref
V (mag)	16.00^Ref	IRAS 12μm (Jy)	-	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	-	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	-	O VI lines	Yes^Ref
BP (mag)	16.01^Ref	IRAS 100μm (Jy)	-
G (mag)	14.19^Ref	AKARI S09 (Jy)	0.48^Ref
RP (mag)	12.77^Ref	AKARI S18 (Jy)	0.30^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	M4 III^Ref, M4 III^Ref, M1 III^Ref, M7.5 III^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	3560^Ref	Radius (R_⊙)	-	Type	-
IR type	S^Ref, D^Ref	Luminosity (L_⊙)	5923^Ref	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_⊙)	1800^Ref
Lower limit (K)	114000^Ref
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

Merrill & Burwell (1950) reported the presence of [Fe VII] lines for the star. It was also suspected as a symbiotic star by Allen & Glass (1974). Stenholm & Acker (1987) reported the detection of emission lines with ionization potentials extending up to 114 eV.

References

Acker, A., Chopinet, M., Pottasch, S. R. et al., 1987, A&AS, 71, 163, 1987A&AS...71..163A
Allen, D. A., Glass, I. S., 1974, MNRAS, 167, 337, 1974MNRAS.167..337A
Allen, D. A., 1978, MNRAS, 184, 601, 1978MNRAS.184..601A
Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Medina Tanco, G. A., Steiner, J. E., 1995, AJ, 109, 1770, 1995AJ....109.1770M
Merrill, P. W., Burwell, C. G., 1950, ApJ, 112, 72, 1950ApJ...112...72M
Mikołajewska, J., Acker, A., Stenholm, B., 1997, A&A, 327, 191, 1997A&A...327..191M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Stenholm, B., Acker, A., 1987, A&AS, 68, 51, 1987A&AS...68...51S
Webster, B. L., Allen, D. A., 1975, MNRAS, 171, 171, 1975MNRAS.171..171W

Last updated: April 17, 2022