New Online Database of Symbiotic Variables: H 2-5

Constellation
Scorpius

Equatorial coordinates
α = 17 15 19.819
δ = -31 33 53.440

Galactic coordinates
l = 354.2053°
b = 4.0179°

Suspected	1987^Ref
Confirmed	1987^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

H 2-5	IRAS 17121-3131	GSC2.4.2 S8HL018243	AAVSO 000-BLH-343
SIMBAD WRAY 15-1655	Pan-STARRS -	SAO -	VSX 59643
GAIA DR3 5980352766931610112	SkyMapper 171519.81-313353.3	WRAY 15-1655	GCVS -
2MASS J17151982-3133534	HIP -	Hen -	BD -
WISE J171519.78-313353.8	TYC -	ESO 454-3	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	H2-5 (Conf.)	Belzcyński et al. (2001)	H 2-5 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	H2-5 (Conf.)	Akras et al. (2019)	PN H 2-5 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	H-2-5 (Conf.)

Position

Right ascension (°)	258.8326^Ref	Parallax (mas)	0.524±0.070^Ref	Reddening E(B-V) (mag)	0.92±0.02^Ref ^{, Note}
Declination (°)	-31.5648^Ref	Distance (kpc)	4.8^Ref 1.98^Ref ^{, Note}, 1.86^Ref ^{, Note}
Galactic longitude (°)	354.2053^Ref	Proper motion in α (mas/yr)	-1.61±0.08^Ref
Galactic latitude (°)	4.0179^Ref	Proper motion in δ (mas/yr)	-2.93±0.06^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	-	J (mag)	7.16^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	6.03^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	5.56^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	4.53^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	5.10^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	5.29^Ref	IPmax (eV)	114^Ref
B (mag)	17.10^Ref	WISE W4 (mag)	5.03^Ref	[O III] lines	No^Ref
V (mag)	14.39^Ref	IRAS 12μm (Jy)	1.20^Ref	He II lines	Yes^Ref
R (mag)	13.87^Ref	IRAS 25μm (Jy)	0.67^Ref	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	2.12^Ref	O VI lines	Yes^Ref
BP (mag)	14.84^Ref	IRAS 100μm (Jy)	18.20^Ref
G (mag)	11.68^Ref	AKARI S09 (Jy)	0.49^Ref
RP (mag)	10.18^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	-	γ velocity (km/h)	-16.55±0.35^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	M7 III^Ref, M6 III^Ref, M5.5 III^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	3073^Ref	Radius (R_⊙)	-	Type	-
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	-
Metallicity [Fe/H]	-			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	-	Luminosity (L_⊙)	300^Ref
Lower limit (K)	114000^Ref
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

987A&AS...68...51S reported the detection of emission lines with ionization potentials extending up to 114 eV for this star. Mikołajewska et al. (1997) classified it as a D-type symbiotic star, which is not supported by other studies.

References

Allen, D. A., 1984, PASA, 5, 3, 369, 1984PASA....5..369A
Medina Tanco, G. A., Steiner, J. E., 1995, AJ, 109, 1770, 1995AJ....109.1770M
Mikołajewska, J., Acker, A., Stenholm, B., 1997, A&A, 327, 191, 1997A&A...327..191M
Stenholm, B., Acker, A., 1987, A&AS, 68, 51, 1987A&AS...68...51S

H 2-5