QW Sge

CONFIRMED MILKY WAY

Constellation
Sagitta

Equatorial coordinates
α = 19 45 49.548
δ = +18 36 47.605

Galactic coordinates
l = 55.6497°
b = -3.0234°

Suspected	1950^Ref
Confirmed	1984^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes?^Ref

Identifiers

QW Sge	IRAS -	GSC2.4.2 N1TW309647	AAVSO 000-BCW-969
SIMBAD EM* AS 360	Pan-STARRS 130332964564446423	SAO -	VSX 27672
GAIA DR3 1824593371126624768	SkyMapper -	WRAY -	GCVS QW Sge
2MASS J19454954+1836477	HIP -	Hen 3-1771	BD -
WISE J194549.54+183647.6	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	MHa 80-5 (Conf.)	Allen (1984)	AS 360 (Conf.)	Belzcyński et al. (2001)	QW Sge (Conf.)
Gaposchkin (1957)	Des. 194119 (Conf.)	Kenyon (1986)	AS 360 (Conf.)	Akras et al. (2019)	QW Sge (Conf.)
Boyarchuk (1969)	MHa 80-5 (Susp.)	Vaidis (1988, 1991)	NSV 12383 (Conf.)

Position

Right ascension (°)	296.4564^Ref	Parallax (mas)	0.202±0.027^Ref	Reddening E(B-V) (mag)	0.65±0.01^Ref ^{, Note}
Declination (°)	18.6132^Ref	Distance (kpc)	10^Ref, 4.2^Ref 4.85^Ref ^{, Note}, 4.62^Ref ^{, Note}
Galactic longitude (°)	55.6497^Ref	Proper motion in α (mas/yr)	-1.28±0.02^Ref
Galactic latitude (°)	-3.0234^Ref	Proper motion in δ (mas/yr)	-3.64±0.03^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	8.32^Ref	Flickering	No^Ref
GALEX FUV (mag)	-	H (mag)	7.37^Ref	Outbursts	Yes?^Ref
GALEX NUV (mag)	-	K (mag)	6.97^Ref	Outburst type	-
IUE	Yes^Ref	WISE W1 (mag)	6.82^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	6.92^Ref	Resolved nebula	No^Ref
U (mag)	-	WISE W3 (mag)	6.54^Ref	IPmax (eV)	114^Ref
B (mag)	13.32^Ref	WISE W4 (mag)	6.02^Ref	[O III] lines	No^Ref
V (mag)	12.69^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)	13.94^Ref	IRAS 100μm (Jy)	-
G (mag)	12.21^Ref	AKARI S09 (Jy)	0.14^Ref
RP (mag)	10.91^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	390.5^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) = 2445528 + 390.5 x E^Ref

Cool component

Spectral type	M6 III^Ref, M4 III^Ref, M5 III^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	3400^Ref	Radius (R_⊙)	156±40^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	-
Metallicity [Fe/H]	0.1±0.14^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.055^Ref	Accretion disk	-
Eff. temperature (K)	-	Luminosity (L_⊙)	-
Lower limit (K)	114000^Ref
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

Merrill & Burwell (1950) reported a combination spectrum of this target. There is a nearby bright variable star located at a distance of 3.5 arcsec (Munari & Jurdana-Šepić, 2002).

References

Allen, D. A., 1984, PASA, 5, 3, 369, 1984PASA....5..369A
Calabro, E., Mammano, A., 1992, Ap&SS, 197, 2, 251, 1992Ap&SS.197..251C
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2023, MNRAS, 526, 1, 918, 2023MNRAS.526..918G
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Merrill, P. W., Burwell, C. G., 1950, ApJ, 112, 72, 1950ApJ...112...72M
Munari, U., Buson, L. M., 1991, A&A, 249, 141, 1991A&A...249..141M
Munari, U., Jurdana-Šepić, R., 2002, A&A, 386, 237, 2002A&A...386..237M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Sokoloski, J. L., Bildsten, L., Ho, W. C. G., 2001, MNRAS, 326, 2, 553, 2001MNRAS.326..553S

Last updated: January 13, 2024