V2116 Oph

Constellation
Ophiucus

Equatorial coordinates
α = 17 32 02.149
δ = -24 44 44.161

Galactic coordinates
l = 1.9370°
b = 4.7950°

Suspected	1976^Ref
Confirmed	1976^Ref
Symbiotic IR type	S^Ref
Hot component type	accreting-only^Ref
Outbursts	-

Identifiers

V2116 Oph	IRAS -	GSC2.4.2 S8D7007887	AAVSO 000-BDY-519
SIMBAD V* V2116 Oph	Pan-STARRS 78302630089755540	SAO -	VSX 22602
GAIA DR3 4110236324513030656	SkyMapper 173202.15-244444.2	WRAY -	GCVS V2116 Oph
2MASS J17320215-2444442	HIP -	Hen -	BD -
WISE J173202.15-244444.1	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	V2116 Oph (Conf.)	Belzcyński et al. (2001)	V2116 Oph (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	V2116 Oph (Conf.)	Akras et al. (2019)	V2116 Oph (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	V2116 Oph (Conf.)

Position

Right ascension (°)	263.0090^Ref	Parallax (mas)	-0.100±0.073^Ref	Reddening E(B-V) (mag)	1.57±0.09^Ref ^{, Note}
Declination (°)	-24.7456^Ref	Distance (kpc)	10^Ref, 13^Ref, 8.3^Ref, 3-6^Ref, 4.3^Ref 9.03^Ref ^{, Note}, 8.38^Ref ^{, Note}
Galactic longitude (°)	1.9370^Ref	Proper motion in α (mas/yr)	-3.52±0.08^Ref
Galactic latitude (°)	4.7950^Ref	Proper motion in δ (mas/yr)	-1.99±0.06^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	γ^Ref	J (mag)	10.10^Ref	Flickering	Yes^Ref
GALEX FUV (mag)	-	H (mag)	8.70^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	7.98^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	7.43^Ref	Jets	Yes?^Ref
FUSE	No^Ref	WISE W2 (mag)	7.14^Ref	Resolved nebula	No^Ref
U (mag)	-	WISE W3 (mag)	6.78^Ref	IPmax (eV)	233.6^Ref
B (mag)	20.78^Ref	WISE W4 (mag)	6.40^Ref	[O III] lines	Yes^Ref
V (mag)	18.40^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)	17.74^Ref	IRAS 100μm (Jy)	-
G (mag)	15.52^Ref	AKARI S09 (Jy)	-
RP (mag)	13.95^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	1160.8±12.4^Ref	γ velocity (km/h)	-176.73±0.22^Ref	Size of giant’s orbit (AU)	1.55^Ref
Eccentricity	0.101±0.022^Ref	RV of giant (km/h)	14.62±0.34^Ref	Separation (AU)	-
Inclination (°)	-	Inferior conj. of giant (JD)	2451943	Mass function	0.371^Ref
Eclipses	-			Mass ratio	1^Ref
Orbital ephemeris	-

Cool component

Spectral type	M6 III^Ref, M6 III^Ref, M5 III^Ref	Mass (M_⊙)	1.5^Ref, 0.8-2^Ref, 0.72-1.22^Ref	Pulsation	-
Eff. temperature (K)	3370^Ref, 3400±200^Ref	Radius (R_⊙)	50-110^Ref, 103^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	280-1300^Ref, 1270^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-0.05^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	NS^Ref	Mass (M_⊙)	1.9^Ref, 1.5^Ref	Spin period (min)	2.04345^Ref, 3.915^Ref, 4.27^Ref, 2.3^Ref, 2.06^Ref
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

Notes

The orbital period of 304 days was previously suggested by Cutler et al. (1986) and Pereira et al. (1999). However, Hinkle et al. (2006) obtained a period of 1160 days from the radial velocities of the giant in the system. The optical variability of the system has been discussed in Majczyna et al. (2016), and the X-ray light curves were studied by Iłkiewicz et al. (2017). In Luna (2023), the spin-down of the neutron star's rotational period is discussed.

References

Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Becker, R. H., Boldt, E. A., Holt, S. S. et al., 1976, ApJL, 207, L167, 1976ApJ...207L.167B
Chakrabarty, D., Roche, P., 1997, ApJ, 489, 1, 254, 1997ApJ...489..254C
Chakrabarty, D., van Kerkwijk, M. H., Larkin, J. E., 1998, ApJL, 497, 1, L39, 1998ApJ...497L..39C
Corbet, R. H. D., Sokoloski, J. L., Mukai, K. et al., 2008, ApJ, 675, 2, 1424, 2008ApJ...675.1424C
Cutler, E. P., Dennis, B. R., Dolan, J. F., 1986, ApJ, 300, 551, 1986ApJ...300..551C
Davidsen, A., Malina, R., Bowyer, S., 1977, ApJ, 211, 866, 1977ApJ...211..866D
Dotani, T., Kii, T., Nagase, F. et al., 1989, PASJ, 41, 427, 1989PASJ...41..427D
Doty, J. P., Hoffman, J. A., Lewin, W. H. G., 1981, ApJ, 243, 257, 1981ApJ...243..257D
Doty, J. P., 1976, IAUC, 2910, 2, 1976IAUC.2910....2D
Ferrigno, C., Segreto, A., Santangelo, A. et al., 2007, A&A, 462, 3, 995, 2007A&A...462..995F
Glass, I. S., Feast, M. W., 1973, Nature Physical Science, 245, 142, 39, 1973NPhS..245...39G
Hinkle, K. H., Fekel, F. C., Joyce, R. R. et al., 2006, ApJ, 641, 1, 479, 2006ApJ...641..479H
Iłkiewicz, K., Mikołajewska, J., Monard, B., 2017, A&A, 601, A105, 2017A&A...601A.105I
Jablonski, F. J., Pereira, M. G., Braga, J. et al., 1997, ApJL, 482, 2, L171, 1997ApJ...482L.171J
Jablonski, F., Pereira, M., Braga, J. et al., 1996, IAUC, 6489, 1, 1996IAUC.6489....1J
Jaisawal, G. K., Naik, S., Gupta, S. et al., 2018, MNRAS, 478, 1, 448, 2018MNRAS.478..448J
Kotani, T., Dotani, T., Nagase, F. et al., 1999, ApJ, 510, 1, 369, 1999ApJ...510..369K
Lewin, W. H. G., Ricker, G. R., Mcclintock, J. E., 1971, ApJL, 169, L17, 1971ApJ...169L..17L
Luna, G. J. M., 2023, A&A, 676, L2, 2023A&A...676L...2L
Majczyna, A., Madej, J., Należyty, M. et al., 2016, 37th Meeting of the Polish Astronomical Society, 3, 133, 2016pas..conf..133M
Makishima, K., Ohashi, T., Sakao, T. et al., 1988, Nature, 333, 6175, 746, 1988Natur.333..746M
Mony, B., Kendziorra, E., Maisack, M. et al., 1991, A&A, 247, 405, 1991A&A...247..405M
Naik, S., Paul, B., Callanan, P. J., 2005, ApJ, 618, 2, 866, 2005ApJ...618..866N
Pereira, M. G., Braga, J., Jablonski, F., 1999, ApJL, 526, 2, L105, 1999ApJ...526L.105P
Ricketts, M. J., Hall, R., Page, C. G. et al., 1982, MNRAS, 201, 759, 1982MNRAS.201..759R
Whitelock, P. A., Menzies, J. W., Feast, M. W., 1983, IAUC, 3885, 3, 1983IAUC.3885....3W
Whitelock, P. A., Menzies, J., 1984, IAUC, 3919, 2, 1984IAUC.3919....2W
van den Eijnden, J., Degenaar, N., Russell, T. D. et al., 2018, MNRAS, 474, 1, L91, 2018MNRAS.474L..91V