New Online Database of Symbiotic Variables: M 2-24

LIKELY MILKY WAY

Constellation
Sagittarius

Equatorial coordinates
α = 18 02 02.891
δ = -34 27 47.312

Galactic coordinates
l = 356.9857°
b = -5.8036°

Suspected	2013^Ref
Confirmed	-
Symbiotic IR type	D?^Ref
Hot component type	shell-burning?^Ref
Outbursts	-

Identifiers

M 2-24	IRAS 17587-3427	GSC2.4.2 S9PC183105	AAVSO -
SIMBAD PN M 2-24	Pan-STARRS -	SAO -	VSX 305998
GAIA DR3 4042147516455759744	SkyMapper -	WRAY 16-351	GCVS -
2MASS J18020289-3427473	HIP -	Hen 2-327	BD -
WISE J180202.89-342747.3	TYC -	ESO 394-20	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	-	Belzcyński et al. (2001)	-
Gaposchkin (1957)	-	Kenyon (1986)	-	Akras et al. (2019)	M 2-24 (Susp.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	-

Position

Right ascension (°)	270.5120^Ref	Parallax (mas)	0.185±0.047^Ref	Reddening E(B-V) (mag)	0.38±0.02^Ref ^{, Note}
Declination (°)	-34.4631^Ref	Distance (kpc)	5.15^Ref ^{, Note}, 4.20^Ref ^{, Note}
Galactic longitude (°)	356.9857^Ref	Proper motion in α (mas/yr)	-2.48±0.05^Ref
Galactic latitude (°)	-5.8036^Ref	Proper motion in δ (mas/yr)	-2.28±0.04^Ref

Observations

X-Ray	No^Ref	IR type	D?^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	12.92^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	11.14^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	9.31^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	6.87^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	5.32^Ref	Resolved nebula	Yes^Ref
U (mag)	-	WISE W3 (mag)	2.80^Ref	IPmax (eV)	46^Ref
B (mag)	15.63^Ref	WISE W4 (mag)	0.89^Ref	[O III] lines	Yes^Ref
V (mag)	14.61^Ref	IRAS 12μm (Jy)	2.72^Ref	He II lines	No^Ref
R (mag)	15.29^Ref	IRAS 25μm (Jy)	4.12^Ref	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	4.34^Ref	O VI lines	No^Ref
BP (mag)	15.00^Ref	IRAS 100μm (Jy)	5.47^Ref
G (mag)	15.06^Ref	AKARI S09 (Jy)	-
RP (mag)	14.21^Ref	AKARI S18 (Jy)	3.19^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	-	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	-
IR type	D?^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	-
Metallicity [Fe/H]	-			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)	-	Luminosity (L_⊙)	-
Lower limit (K)	46000^Ref
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

The spectroscopy of this extremely red source (J - K = 3.61 mag), resembles that of other D-type symbiotic stars with a highly ionized emission-line spectrum (Miszalski et al., 2013).

References

Miszalski, B., Mikołajewska, J., Udalski, A., 2013, MNRAS, 432, 4, 3186, 2013MNRAS.432.3186M

M 2-24