LT Del

Constellation
Delphinus

Equatorial coordinates
α = 20 35 57.235
δ = +20 11 27.465

Galactic coordinates
l = 63.3967°
b = -12.1503°

Suspected	1974^Ref
Confirmed	1976^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref - Z And^Ref

Identifiers

LT Del	IRAS -	GSC2.4.2 N2PF000443	AAVSO 000-BCV-823
SIMBAD V* LT Del	Pan-STARRS 132223089885149651	SAO -	VSX 13555
GAIA DR3 1817300516637652352	SkyMapper -	WRAY -	GCVS LT Del
2MASS J20355722+2011275	HIP -	Hen 2-467	BD -
WISE J203557.23+201127.4	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	He2-467 (Conf.)	Belzcyński et al. (2001)	LT Del (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	He2-467 (Conf.)	Akras et al. (2019)	LT Del (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	LT Del (Conf.)

Position

Right ascension (°)	308.9885^Ref	Parallax (mas)	0.085±0.015^Ref	Reddening E(B-V) (mag)	0.08±0.0^Ref ^{, Note}
Declination (°)	20.1910^Ref	Distance (kpc)	2^Ref, 3.9^Ref 9.87^Ref ^{, Note}, 9.43^Ref ^{, Note}
Galactic longitude (°)	63.3967^Ref	Proper motion in α (mas/yr)	-0.54±0.01^Ref
Galactic latitude (°)	-12.1503^Ref	Proper motion in δ (mas/yr)	-2.60±0.01^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	-	J (mag)	10.46^Ref	Flickering	No^Ref
GALEX FUV (mag)	15.94^Ref	H (mag)	9.67^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	16.38^Ref	K (mag)	9.50^Ref	Outburst type	Z And^Ref
IUE	No^Ref	WISE W1 (mag)	9.32^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	9.34^Ref	Resolved nebula	No ^Ref
U (mag)	-	WISE W3 (mag)	8.95^Ref	IPmax (eV)	77.5 (UV)^Ref, 54.4^Ref
B (mag)	-	WISE W4 (mag)	8.16^Ref	[O III] lines	Yes^Ref
V (mag)	-	IRAS 12μm (Jy)	-	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	-	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	-	O VI lines	No^Ref
BP (mag)	13.40^Ref	IRAS 100μm (Jy)	-
G (mag)	12.60^Ref	AKARI S09 (Jy)	-
RP (mag)	11.71^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	478.5±2.5^Ref, 465.6^Ref, 462.81±6.88^Ref	γ velocity (km/h)	-100.54±2.66^Ref	Size of giant’s orbit (AU)	-
Eccentricity	0.4±0.1^Ref	RV of giant (km/h)	-	Separation (AU)	-
Inclination (°)	-	Inferior conj. of giant (JD)	-	Mass function	-
Eclipses	No^Ref			Mass ratio	1.63^Ref
Orbital ephemeris	Min (U) = 2445910 + 478.5±2.5^Ref, Min (B) = 2440493 + 465.6 x E^Ref

Cool component

Spectral type	G6 III^Ref, K0 III^Ref	Mass (M_⊙)	1^Ref, 0.93^Ref	Pulsation	-
Eff. temperature (K)	4400±150^Ref	Radius (R_⊙)	30^Ref, 46^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	140^Ref, 230^Ref, 700^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-1.1±0.1^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	0.57^Ref	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.06^Ref	Accretion disk	-
Eff. temperature (K)	200000^Ref, 105000-130000^Ref	Luminosity (L_⊙)	5400^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

The optical spectrum of this object exhibits emission lines with ionization potentials of up to 54 eV, including He II, as observed by Munari & Buson (1992). Additionally, UV spectra revealed N V lines. Notably, the object displays both hot and cool outbursts similar to AG Dra, as reported by Ikonnikova et al. (2019).

References

Allen, D. A., 1974, MNRAS, 168, 1, 1974MNRAS.168....1A
Arkhipova, V. P., Esipov, V. F., Ikonnikova, N. P. et al., 2011, AstL, 37, 5, 343, 2011AstL...37..343A
Arkhipova, V. P., Ikonnikova, N. P., Noskova, R. I., 1995, AstL, 21, 3, 339, 1995AstL...21..339A
Beck, P. G., Grossmann, D. H., Steinwender, L. et al., 2023, arXiv, arXiv:2307.10812, 2023arXiv230710812B
Ikonnikova, N. P., Burlak, M. A., Arkhipova, V. P. et al., 2019, AstL, 45, 4, 217, 2019AstL...45..217I
Ikonnikova, N. P., Komissarova, G. V., Arkhipova, V. P., 2019, AstL, 45, 6, 361, 2019AstL...45..361I
Kaler, J. B., Lutz, J. H., 1980, PASP, 92, 81, 1980PASP...92...81K
Luna, G. J. M., Sokoloski, J. L., Mukai, K. et al., 2013, A&A, 559, A6, 2013A&A...559A...6L
Lutz, J. H., Lutz, T. E., Kaler, J. B. et al., 1976, ApJ, 203, 481, 1976ApJ...203..481L
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Munari, U., Buson, L. M., 1992, A&A, 255, 158, 1992A&A...255..158M
Munari, U., Jurdana-Šepić, R., 2002, A&A, 386, 237, 2002A&A...386..237M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Pereira, C. B., Smith, V. V., Cunha, K., 1998, AJ, 116, 4, 1977, 1998AJ....116.1977P
Skopal, A., 2005, A&A, 440, 3, 995, 2005A&A...440..995S
Sokoloski, J. L., Bildsten, L., Ho, W. C. G., 2001, MNRAS, 326, 2, 553, 2001MNRAS.326..553S