New Online Database of Symbiotic Variables: IV Vir

Constellation
Virgo

Equatorial coordinates
α = 14 16 34.293
δ = -21 45 50.315

Galactic coordinates
l = 327.8816°
b = 36.9490°

Suspected	1973^Ref
Confirmed	1984^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

IV Vir	IRAS -	GSC2.4.2 S8ZE000103	AAVSO 000-BCX-528
SIMBAD BD-21 3873	Pan-STARRS 81882141429113607	SAO -	VSX 38047
GAIA DR3 6276714894852124032	SkyMapper 141634.30-214550.1	WRAY -	GCVS IV Vir
2MASS J14163429-2145500	HIP -	Hen -	BD -21 3873
WISE J141634.28-214550.2	TYC 6151-1012-1	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	BD-21.3873 (Conf.)	Belzcyński et al. (2001)	BD-21 3873 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	BD-21°3873 (Conf.)	Akras et al. (2019)	BD-21 3873 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	-21°3873 (Conf.)

Position

Right ascension (°)	214.1429^Ref	Parallax (mas)	0.251±0.018^Ref	Reddening E(B-V) (mag)	0.11±0.0^Ref ^{, Note}
Declination (°)	-21.7640^Ref	Distance (kpc)	1.3^Ref 3.53^Ref ^{, Note}, 3.28^Ref ^{, Note}
Galactic longitude (°)	327.8816^Ref	Proper motion in α (mas/yr)	1.64±0.02^Ref
Galactic latitude (°)	36.9490^Ref	Proper motion in δ (mas/yr)	-17.39±0.02^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	-	J (mag)	8.12^Ref	Flickering	No^Ref
GALEX FUV (mag)	13.95^Ref	H (mag)	7.32^Ref	Outbursts	-
GALEX NUV (mag)	14.51^Ref	K (mag)	7.13^Ref	Outburst type	-
IUE	Yes^Ref	WISE W1 (mag)	6.98^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	6.97^Ref	Resolved nebula	No^Ref
U (mag)	-	WISE W3 (mag)	6.73^Ref	IPmax (eV)	77.5^Ref
B (mag)	12.06^Ref	WISE W4 (mag)	6.15^Ref	[O III] lines	No^Ref
V (mag)	10.68^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	No^Ref
BP (mag)	11.00^Ref	IRAS 100μm (Jy)	-
G (mag)	10.18^Ref	AKARI S09 (Jy)	-
RP (mag)	9.30^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	281.6±1.2^Ref	γ velocity (km/h)	203.9±0.2^Ref, 23.56±2.86^Ref	Size of giant’s orbit (AU)	0.276^Ref
Eccentricity	0^Ref	RV of giant (km/h)	10.6±0.3^Ref	Separation (AU)	-
Inclination (°)	68^Ref	Inferior conj. of giant (JD)	2449087.3	Mass function	0.035^Ref
Eclipses	-			Mass ratio	2^Ref
Orbital ephemeris	-

Cool component

Spectral type	G8 III^Ref, K2 III^Ref	Mass (M_⊙)	0.9^Ref	Pulsation	-
Eff. temperature (K)	4300^Ref, 4420±100^Ref, 4100^Ref	Radius (R_⊙)	37^Ref, 20.8^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	780^Ref, 190^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-1.34^Ref, -1.06±0.17^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	-	Mass (M_⊙)	0.45^Ref	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	75000^Ref	Luminosity (L_⊙)	-
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

Bidelman & Macconnell (1973) reported the presence of Balmer and He II lines. The cool component was subsequently classified as a G-type by Allen (1980). Smith et al. (1997) suggested that this star is a twin of AG Dra in terms of metallicities, carbon overabundances, and s-process abundance distributions.

References

Allen, D. A., 1980, MNRAS, 192, 521, 1980MNRAS.192..521A
Allen, D. A., 1984, PASA, 5, 3, 369, 1984PASA....5..369A
Bidelman, W. P., Macconnell, D. J., 1973, AJ, 78, 687, 1973AJ.....78..687B
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Munari, U., Henden, A., Frigo, A. et al., 2014, AJ, 148, 5, 81, 2014AJ....148...81M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Niehues, M., Bruch, A., Duerbeck, H. W., 1992, The Messenger, 67, 38, 1992Msngr..67...38N
Pereira, C. B., Porto de Mello, G. F., 1997, AJ, 114, 2128, 1997AJ....114.2128P
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
Smith, V. V., Cunha, K., Jorissen, A. et al., 1997, A&A, 324, 97, 1997A&A...324...97S

IV Vir