New Online Database of Symbiotic Variables: V2756 Sgr

Constellation
Sagittarius

Equatorial coordinates
α = 18 14 34.516
δ = -29 49 23.950

Galactic coordinates
l = 2.3559°
b = -5.9187°

Suspected	1969^Ref
Confirmed	1969^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

V2756 Sgr	IRAS -	GSC2.4.2 S9SL000929	AAVSO 000-BCB-708
SIMBAD EM* AS 293	Pan-STARRS 72212736438162357	SAO -	VSX 30456
GAIA DR3 4049689204148424832	SkyMapper -	WRAY 16-392	GCVS V2756 Sgr
2MASS J18143452-2949237	HIP -	Hen 2-370	BD -
WISE J181434.52-294923.6	TYC -	ESO 456-79	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	V2756 Sgr (Conf.)	Belzcyński et al. (2001)	V2756 Sgr (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	V2756 Sgr (Conf.)	Akras et al. (2019)	V2756 Sgr (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	V2756 Sgr (Conf.)

Position

Right ascension (°)	273.6438^Ref	Parallax (mas)	0.087±0.035^Ref	Reddening E(B-V) (mag)	0.27±0.01^Ref ^{, Note}
Declination (°)	-29.8233^Ref	Distance (kpc)	3^Ref, 4^Ref 8.13^Ref ^{, Note}, 8.45^Ref ^{, Note}
Galactic longitude (°)	2.3559^Ref	Proper motion in α (mas/yr)	-4.66±0.04^Ref
Galactic latitude (°)	-5.9187^Ref	Proper motion in δ (mas/yr)	-5.98±0.03^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	9.19^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	8.28^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	7.89^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	7.59^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.71^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	7.24^Ref	IPmax (eV)	114^Ref
B (mag)	11.00^Ref	WISE W4 (mag)	6.80^Ref	[O III] lines	Yes^Ref
V (mag)	12.70^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)	12.88^Ref	IRAS 100μm (Jy)	-
G (mag)	12.17^Ref	AKARI S09 (Jy)	-
RP (mag)	11.09^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	480±19^Ref, 725±3^Ref	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	Yes^Ref			Mass ratio	-
Orbital ephemeris	Min (V) = 2451894 + 480±19 x E^Ref

Cool component

Spectral type	M2 III^Ref, M3 III^Ref, K5 III^Ref, M1 III^Ref, M4 III^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	3649^Ref, 3500^Ref	Radius (R_⊙)	-	Type	-
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	-
Metallicity [Fe/H]	-0.08±0.07^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_⊙)	900^Ref
Lower limit (K)	67000^Ref
Upper limit (K)	110000^Ref

Links

SIMBAD CDS Portal

Notes

In Herbig (1969), a strong continuous spectrum with intense Hβ and He II was reported. Furthermore, [Fe VII] lines were detected by Stenholm & Acker (1987). The variability of the source was documented in Hoffleit (1970).

References

Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Allen, D. A., 1984, PASA, 5, 3, 369, 1984PASA....5..369A
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2017, MNRAS, 466, 2, 2194, 2017MNRAS.466.2194G
Gromadzki, M., Mikołajewska, J., Soszyński, I., 2013, AcA, 63, 4, 405, 2013AcA....63..405G
Herbig, G. H., 1969, PNAS, 63, 4, 1045, 1969PNAS...63.1045H
Hoffleit, D., 1970, IBVS, 469, 1, 1970IBVS..469....1H
Medina Tanco, G. A., Steiner, J. E., 1995, AJ, 109, 1770, 1995AJ....109.1770M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Stenholm, B., Acker, A., 1987, A&AS, 68, 51, 1987A&AS...68...51S

V2756 Sgr