New Online Database of Symbiotic Variables: MWC 960

Constellation
Sagittarius

Equatorial coordinates
α = 18 47 55.813
δ = -20 05 51.092

Galactic coordinates
l = 14.5315°
b = -8.2732°

Suspected	1969^Ref
Confirmed	1969^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

MWC 960	IRAS -	GSC2.4.2 SA6U000030	AAVSO 000-BCD-312
SIMBAD EM* MWC 960	Pan-STARRS 83882819825883313	SAO -	VSX 63027
GAIA DR3 4085984602713782784	SkyMapper 184755.81-200550.9	WRAY -	GCVS -
2MASS J18475581-2005508	HIP -	Hen 3-1726	BD -
WISE J184755.81-200551.0	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	MWC 960 (Conf.)	Belzcyński et al. (2001)	MWC 960 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	MWC 960 (Conf.)	Akras et al. (2019)	MWC 960 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	MHA 204-22 (Conf.)

Position

Right ascension (°)	281.9826^Ref	Parallax (mas)	0.117±0.022^Ref	Reddening E(B-V) (mag)	0.28±0.01^Ref ^{, Note}
Declination (°)	-20.0975^Ref	Distance (kpc)	2.5^Ref 7.11^Ref ^{, Note}, 6.27^Ref ^{, Note}
Galactic longitude (°)	14.5315^Ref	Proper motion in α (mas/yr)	0.98±0.02^Ref
Galactic latitude (°)	-8.2732^Ref	Proper motion in δ (mas/yr)	-6.91±0.02^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	-	J (mag)	8.88^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	8.09^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	7.81^Ref	Outburst type	-
IUE	Yes^Ref	WISE W1 (mag)	7.63^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.55^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	6.97^Ref	IPmax (eV)	114^Ref
B (mag)	13.78^Ref	WISE W4 (mag)	5.98^Ref	[O III] lines	No^Ref
V (mag)	12.15^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	Yes^Ref
BP (mag)	12.28^Ref	IRAS 100μm (Jy)	-
G (mag)	11.34^Ref	AKARI S09 (Jy)	-
RP (mag)	10.37^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	-	γ velocity (km/h)	-228.7±0.5^Ref, -223.61±2.26^Ref	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	M0 III^Ref, K7 III^Ref	Mass (M_⊙)	-	Pulsation	Yes^Ref
Eff. temperature (K)	4000^Ref	Radius (R_⊙)	-	Type	SR^Ref
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	183±3^Ref
Metallicity [Fe/H]	-1.72^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	-	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	90000^Ref	Luminosity (L_⊙)	-
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

Herbig (1969) reported a smooth but low-temperature continuum with strong lines of Hβ and He II. Additionally, Allen (1978) detected O VI lines in the spectrum.

References

Allen, D. A., 1978, MNRAS, 184, 601, 1978MNRAS.184..601A
Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Gromadzki, M., Mikołajewska, J., Soszyński, I., 2013, AcA, 63, 4, 405, 2013AcA....63..405G
Herbig, G. H., 1969, PNAS, 63, 4, 1045, 1969PNAS...63.1045H
Munari, U., Buson, L. M., 1994, A&A, 287, 87, 1994A&A...287...87M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Pereira, C. B., Baella, N. O., Drake, N. A. et al., 2017, ApJ, 841, 1, 50, 2017ApJ...841...50P

MWC 960