DD Mic

CONFIRMED MILKY WAY

Constellation
Microscopium

Equatorial coordinates
α = 21 00 06.343
δ = -42 38 44.968

Galactic coordinates
l = 358.6552°
b = -41.1044°

Suspected	1976^Ref
Confirmed	1984^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes?^Ref

Identifiers

DD Mic	IRAS -	GSC2.4.2 SCJ7000499	AAVSO 000-BFR-596
SIMBAD CD-43 14304	Pan-STARRS -	SAO -	VSX 137552
GAIA DR3 6485077605356668032	SkyMapper 210006.34-423844.8	WRAY -	GCVS DD Mic
2MASS J21000636-4238448	HIP -	Hen 3-1924	BD -
WISE J210006.34-423844.9	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	CD-43.14304 (Conf.)	Belzcyński et al. (2001)	CD-43 14304 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	CD-43°14304 (Conf.)	Akras et al. (2019)	CD-43 14304 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	CD-43°14304 (Conf.)

Position

Right ascension (°)	315.0264^Ref	Parallax (mas)	0.107±0.021^Ref	Reddening E(B-V) (mag)	0.03±0.0^Ref ^{, Note}
Declination (°)	-42.6458^Ref	Distance (kpc)	1.2^Ref, 1.3^Ref, 2.1^Ref 6.89^Ref ^{, Note}, 7.21^Ref ^{, Note}
Galactic longitude (°)	358.6552^Ref	Proper motion in α (mas/yr)	-10.08±0.02^Ref
Galactic latitude (°)	-41.1044^Ref	Proper motion in δ (mas/yr)	-2.04±0.02^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	α^Ref	J (mag)	8.58^Ref	Flickering	No^Ref
GALEX FUV (mag)	14.04^Ref	H (mag)	7.76^Ref	Outbursts	Yes?^Ref
GALEX NUV (mag)	14.14^Ref	K (mag)	7.53^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	7.36^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.32^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	6.71^Ref	IPmax (eV)	114^Ref
B (mag)	12.55^Ref	WISE W4 (mag)	5.81^Ref	[O III] lines	No^Ref
V (mag)	11.49^Ref	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	Yes^Ref
BP (mag)	11.51^Ref	IRAS 100μm (Jy)	-
G (mag)	10.74^Ref	AKARI S09 (Jy)	0.14^Ref
RP (mag)	9.84^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	1442^Ref, 1434±19^Ref	γ velocity (km/h)	27.5^Ref, 27.4±0.2^Ref	Size of giant’s orbit (AU)	0.52^Ref
Eccentricity	0.22^Ref, 0.23±0.08^Ref	RV of giant (km/h)	4.6^Ref, 4.5±0.4^Ref	Separation (AU)	-
Inclination (°)	57.6±5.8^Ref	Inferior conj. of giant (JD)	2445560,2449917	Mass function	0.013^Ref
Eclipses	Yes^Ref			Mass ratio	-
Orbital ephemeris	-

Cool component

Spectral type	K3 III^Ref, K5 - M0 III^Ref, K7 III^Ref, M0.3 III^Ref	Mass (M_⊙)	-	Pulsation	Yes?^Ref
Eff. temperature (K)	4000^Ref, 4300^Ref, 3900^Ref	Radius (R_⊙)	40^Ref	Type	SR?^Ref
IR type	S^Ref	Luminosity (L_⊙)	380^Ref, 220^Ref	Pulsation period (days)	399^Ref
Metallicity [Fe/H]	-1.15^Ref, -0.93±0.06^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.037^Ref	Accretion disk	-
Eff. temperature (K)	110000^Ref, 162000^Ref	Luminosity (L_⊙)	850^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

References

Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Henize, K. G., 1976, ApJS, 30, 491, 1976ApJS...30..491H
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Mürset, U., Wolff, B., Jordan, S., 1997, A&A, 319, 201, 1997A&A...319..201M
Pereira, C. B., Roig, F., 2009, AJ, 137, 1, 118, 2009AJ....137..118P
Schmid, H. M., Dumm, T., Murset, U. et al., 1998, A&A, 329, 986, 1998A&A...329..986S
Schmid, H. M., Nussbaumer, H., 1993, A&A, 268, 159, 1993A&A...268..159S
Schulte-Ladbeck, R. E., 1988, A&A, 189, 97, 1988A&A...189...97S
Skopal, A., 2005, A&A, 440, 3, 995, 2005A&A...440..995S

Last updated: January 13, 2024