New Online Database of Symbiotic Variables: NQ Gem

Constellation
Gemini

Equatorial coordinates
α = 07 31 54.509
δ = +24 30 12.497

Galactic coordinates
l = 194.6331°
b = 19.3527°

Suspected	1971^Ref
Confirmed	2013^Ref
Symbiotic IR type	S^Ref
Hot component type	accreting-only^Ref
Outbursts	-

Identifiers

NQ Gem	IRAS 07288+2436	GSC2.4.2 N8EL000320	AAVSO 000-BCV-951
SIMBAD V* NQ Gem	Pan-STARRS 137401129770974696	SAO 79474	VSX 14586
GAIA DR3 868424696282795392	SkyMapper -	WRAY -	GCVS NQ Gem
2MASS J07315451+2430125	HIP 36623	Hen -	BD +24 1686
WISE J073154.51+243012.7	TYC 1914-857-1	ESO -	HD 59643

Symbiotic Catalogs

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

Position

Right ascension (°)	112.9771^Ref	Parallax (mas)	0.952±0.077^Ref	Reddening E(B-V) (mag)	0.05±0.0^Ref ^{, Note}
Declination (°)	24.5035^Ref	Distance (kpc)	1.01^Ref ^{, Note}, 1.04^Ref ^{, Note}
Galactic longitude (°)	194.6331^Ref	Proper motion in α (mas/yr)	-10.24±0.08^Ref
Galactic latitude (°)	19.3527^Ref	Proper motion in δ (mas/yr)	-4.08±0.08^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	β/δ^Ref	J (mag)	4.72^Ref	Flickering	No^Ref, Yes^Ref
GALEX FUV (mag)	15.70^Ref	H (mag)	3.64^Ref	Outbursts	-
GALEX NUV (mag)	14.53^Ref	K (mag)	3.26^Ref	Outburst type	-
IUE	Yes^Ref	WISE W1 (mag)	3.02^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	1.79^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	2.79^Ref	IPmax (eV)	54.4 (UV)^Ref
B (mag)	10.26^Ref	WISE W4 (mag)	2.71^Ref	[O III] lines	No^Ref
V (mag)	8.01^Ref	IRAS 12μm (Jy)	3.28^Ref	He II lines	No^Ref
R (mag)	-	IRAS 25μm (Jy)	0.84^Ref	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	0.40^Ref	O VI lines	No^Ref
BP (mag)	8.30^Ref	IRAS 100μm (Jy)	1.00^Ref
G (mag)	7.22^Ref	AKARI S09 (Jy)	4.40^Ref
RP (mag)	6.20^Ref	AKARI S18 (Jy)	1.09^Ref

Orbit

Orbital period (days)	1304.8±4.3^Ref	γ velocity (km/h)	45.71±0.13^Ref	Size of giant’s orbit (AU)	0.4887^Ref
Eccentricity	0.182±0.029^Ref	RV of giant (km/h)	5.96±0.18^Ref	Separation (AU)	-
Inclination (°)	-	Inferior conj. of giant (JD)	2446207	Mass function	0.0272^Ref
Eclipses	-			Mass ratio	-
Orbital ephemeris	-

Cool component

Spectral type	C6.2^Ref	Mass (M_⊙)	-	Pulsation	Yes^Ref
Eff. temperature (K)	3711^Ref	Radius (R_⊙)	36^Ref	Type	SR^Ref
IR type	S^Ref	Luminosity (L_⊙)	2119.03^Ref	Pulsation period (days)	58±1^Ref
Metallicity [Fe/H]	-0.7^Ref			Pulsation ephemeris	-

Hot component

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

Links

SIMBAD CDS Portal ARAS Database

Notes

Brightening of the UV spectrum was detected by Greene & Wing (1971), who suggested that the object might be a symbiotic star. This was later supported by Johnson et al. (1988), who analyzed UV data and suggested that the system contains a white dwarf accreting from the carbon giant. Dalmeri et al. (1997) did not detect significant optical photometric variability. An orbital period of 1705 days was obtained by Carquillat & Prieur (2008). In addition, Luna et al. (2013) detected X-ray emission from the source and suggested it is a WD symbiotic. Merc et al. (2023) detected flickering-like variability in its TESS light curves.

References

Carquillat, J.-M., Prieur, J. -L., 2008, AN, 329, 1, 44, 2008AN....329...44C
Dalmeri, I., Rejkuba, M., Munari, U., 1997, IBVS, 4521, 1, 1997IBVS.4521....1D
Greene, A. E., Wing, R. F., 1971, ApJ, 163, 309, 1971ApJ...163..309G
Johnson, H. R., Eaton, J. A., Querci, F. R. et al., 1988, A&A, 204, 149, 1988A&A...204..149J
Luna, G. J. M., Sokoloski, J. L., Mukai, K. et al., 2013, A&A, 559, A6, 2013A&A...559A...6L
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Toalá, J. A., Botello, M. K., Sabin, L., 2023, ApJ, 948, 1, 14, 2023ApJ...948...14T

NQ Gem