New Online Database of Symbiotic Variables: Sa 2-237

Constellation
Serpens

Equatorial coordinates
α = 17 44 42.141
δ = -15 45 12.551

Galactic coordinates
l = 11.1920°
b = 7.0140°

Suspected	2002^Ref
Confirmed	-
Symbiotic IR type	D'?^Ref
Hot component type	shell-burning?^Ref
Outbursts	-

Identifiers

Sa 2-237	IRAS 17418-1544	GSC2.4.2 S81O027485	AAVSO -
SIMBAD PN Sa 2-237	Pan-STARRS 89092661756016159	SAO -	VSX -
GAIA DR3 4148175523033388928	SkyMapper 174442.13-154512.4	WRAY -	GCVS -
2MASS J17444215-1545127	HIP -	Hen -	BD -
WISE J174442.19-154512.7	TYC -	ESO -	HD -

Symbiotic Catalogs

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

Position

Right ascension (°)	266.1756^Ref	Parallax (mas)	0.625±0.044^Ref	Reddening E(B-V) (mag)	0.46±0.01^Ref ^{, Note}
Declination (°)	-15.7535^Ref	Distance (kpc)	1.53^Ref ^{, Note}, 1.49^Ref ^{, Note}
Galactic longitude (°)	11.1920^Ref	Proper motion in α (mas/yr)	-2.11±0.04^Ref
Galactic latitude (°)	7.0140^Ref	Proper motion in δ (mas/yr)	5.30±0.03^Ref

Observations

X-Ray	-	IR type	D'?^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	13.07^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	12.57^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	11.82^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	9.60^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.58^Ref	Resolved nebula	Yes^Ref
U (mag)	-	WISE W3 (mag)	3.53^Ref	IPmax (eV)	-
B (mag)	15.57^Ref	WISE W4 (mag)	0.81^Ref	[O III] lines	-
V (mag)	14.52^Ref	IRAS 12μm (Jy)	1.17^Ref	He II lines	-
R (mag)	-	IRAS 25μm (Jy)	6.01^Ref	[Fe VII] lines	-
I (mag)	-	IRAS 60μm (Jy)	16.60^Ref	O VI lines	-
BP (mag)	15.34^Ref	IRAS 100μm (Jy)	8.29^Ref
G (mag)	14.80^Ref	AKARI S09 (Jy)	0.70^Ref
RP (mag)	14.06^Ref	AKARI S18 (Jy)	2.59^Ref

Orbit

Orbital period (days)	-	γ velocity (km/h)	-54.51±12.44^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	K III^Ref	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)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

The object is suggested to be a former symbiotic nova, according to Schwarz et al. (2002). Additionally, López et al. (2003) proposed that the object is a bipolar symbiotic nebula with a K-type giant central star.

References

López, J. A., Vázquez, R., Miranda, L. F. et al., 2003, Symbiotic Stars Probing Stellar Evolution, 303, 441, 2003ASPC..303..441L
Schwarz, H. E., Corradi, R. R. L., Montez, R., 2002, ApJ, 565, 2, 1084, 2002ApJ...565.1084S

Sa 2-237