Hen 2-87

CONFIRMED MILKY WAY

Constellation
Crux

Equatorial coordinates
α = 12 45 46.988
δ = -63 00 35.646

Galactic coordinates
l = 302.2904°
b = -0.1452°

Suspected	1974^Ref
Confirmed	1978^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

Hen 2-87	IRAS -	GSC2.4.2 S7LP113692	AAVSO 000-BJT-869
SIMBAD WRAY 16-119	Pan-STARRS -	SAO -	VSX 57910
GAIA DR3 5862972414572104192	SkyMapper 124547.02-630035.6	WRAY 16-119	GCVS -
2MASS J12454702-6300356	HIP -	Hen 2-87	BD -
WISE J124547.00-630035.5	TYC -	ESO 95-16	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	Hen 2-87 (Conf.)	Belzcyński et al. (2001)	Hen 2-87 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	He2-87 (Conf.)	Akras et al. (2019)	Hen 2-87 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	VDS 32 (Conf.)

Position

Right ascension (°)	191.4458^Ref	Parallax (mas)	0.132±0.033^Ref	Reddening E(B-V) (mag)	6.06±0.91^Ref ^{, Note}
Declination (°)	-63.0099^Ref	Distance (kpc)	13^Ref, 3.5^Ref 5.30^Ref ^{, Note}, 5.03^Ref ^{, Note}
Galactic longitude (°)	302.2904^Ref	Proper motion in α (mas/yr)	-8.22±0.03^Ref
Galactic latitude (°)	-0.1452^Ref	Proper motion in δ (mas/yr)	-0.13±0.04^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	β^Ref	J (mag)	8.58^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	6.93^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	6.04^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	5.65^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	5.16^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	3.24^Ref	IPmax (eV)	114^Ref
B (mag)	16.60^Ref	WISE W4 (mag)	2.35^Ref	[O III] lines	Yes^Ref
V (mag)	16.61^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)	15.57^Ref	IRAS 100μm (Jy)	-
G (mag)	13.83^Ref	AKARI S09 (Jy)	2.45^Ref
RP (mag)	12.39^Ref	AKARI S18 (Jy)	1.25^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	M7.5^Ref, M5.5 III^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	3300^Ref	Radius (R_⊙)	-	Type	-
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	-
Metallicity [Fe/H]	0.17±0.09^Ref			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_⊙)	700^Ref
Lower limit (K)	114000^Ref
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

Originally identified as a stellar source in Sanduleak & Stephenson (1973), later noted as a highly reddened symbiotic star in Allen (1978).

References

Allen, D. A., Glass, I. S., 1974, MNRAS, 167, 337, 1974MNRAS.167..337A
Allen, D. A., 1978, MNRAS, 184, 601, 1978MNRAS.184..601A
Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Mikołajewska, J., Acker, A., Stenholm, B., 1997, A&A, 327, 191, 1997A&A...327..191M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Nuñez, N. E., Luna, G. J. M., Pillitteri, I. et al., 2014, A&A, 565, A82, 2014A&A...565A..82N
Nuñez, N. E., Luna, G. J. M., 2012, BAAA, 55, 491, 2012BAAA...55..491N
Sanduleak, N., Stephenson, C. B., 1973, ApJ, 185, 899, 1973ApJ...185..899S

Last updated: April 15, 2022