AG Peg

Constellation
Pegasus

Equatorial coordinates
α = 21 51 01.972
δ = +12 37 32.100

Galactic coordinates
l = 69.2778°
b = -30.8869°

Suspected	1942^Ref
Confirmed	1951^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref - SyN + Z And^Ref

Identifiers

AG Peg	IRAS 21486+1223	GSC2.4.2 N0IE000339	AAVSO 000-BCP-436
SIMBAD V* AG Peg	Pan-STARRS 123153277580851277	SAO 107436	VSX 25183
GAIA DR3 1766454215586119680	SkyMapper -	WRAY -	GCVS AG Peg
2MASS J21510198+1237320	HIP 107848	Hen -	BD +11 4673
WISE J215101.95+123732.0	TYC 1130-653-1	ESO -	HD 207757

Symbiotic Catalogs

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

Position

Right ascension (°)	327.7582^Ref	Parallax (mas)	0.754±0.035^Ref	Reddening E(B-V) (mag)	0.08±0.0^Ref ^{, Note}
Declination (°)	12.6256^Ref	Distance (kpc)	0.8^Ref 1.27^Ref ^{, Note}, 1.27^Ref ^{, Note}
Galactic longitude (°)	69.2778^Ref	Proper motion in α (mas/yr)	-1.38±0.04^Ref
Galactic latitude (°)	-30.8869^Ref	Proper motion in δ (mas/yr)	-1.73±0.03^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	β^Ref	J (mag)	5.00^Ref	Flickering	No^Ref
GALEX FUV (mag)	-	H (mag)	4.37^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	-	K (mag)	3.85^Ref	Outburst type	SyN + Z And^Ref
IUE	Yes^Ref	WISE W1 (mag)	3.82^Ref	Jets	-
FUSE	Yes^Ref	WISE W2 (mag)	3.56^Ref	Resolved nebula	Yes^Ref
U (mag)	-	WISE W3 (mag)	3.62^Ref	IPmax (eV)	99.0^Ref, 109.3 (UV)^Ref
B (mag)	10.23^Ref	WISE W4 (mag)	3.08^Ref	[O III] lines	Yes^Ref
V (mag)	8.78^Ref	IRAS 12μm (Jy)	1.85^Ref	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	0.63^Ref	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	0.43^Ref	O VI lines	No^Ref
BP (mag)	8.79^Ref	IRAS 100μm (Jy)	2.90^Ref
G (mag)	7.81^Ref	AKARI S09 (Jy)	2.15^Ref
RP (mag)	6.70^Ref	AKARI S18 (Jy)	0.80^Ref

Orbit

Orbital period (days)	816.5±0.9^Ref, 812.3±6.3^Ref, 818.2±1.6^Ref	γ velocity (km/h)	-16.0±0.5^Ref, -15.86±0.15^Ref	Size of giant’s orbit (AU)	0.39^Ref, 0.406^Ref
Eccentricity	0.12±0.13^Ref, 0.11±0.039^Ref	RV of giant (km/h)	5.3±0.6^Ref, 5.44±0.2^Ref	Separation (AU)	2.5±0.1^Ref
Inclination (°)	50^Ref	Inferior conj. of giant (JD)	231667.5,2446812	Mass function	0.012^Ref, 0.0135^Ref
Eclipses	No^Ref			Mass ratio	4^Ref
Orbital ephemeris	Max (V) = 2442710.1±6 + 816.5±0.9 x E^Ref

Cool component

Spectral type	M4 III^Ref, M3 III^Ref, M3III^Ref, M3 III^Ref	Mass (M_⊙)	2.6±0.4^Ref	Pulsation	Yes^Ref
Eff. temperature (K)	3650^Ref	Radius (R_⊙)	85^Ref	Type	SR^Ref
IR type	S^Ref	Luminosity (L_⊙)	1150^Ref, 1100^Ref	Pulsation period (days)	55±1^Ref
Metallicity [Fe/H]	-0.51±0.06^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	0.65±0.1^Ref, 0.65^Ref	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.06^Ref, 0.050-0.058^Ref	Accretion disk	-
Eff. temperature (K)	95000^Ref, 150000^Ref, 154000-168000^Ref	Luminosity (L_⊙)	1180-2400^Ref, 1729^Ref, 1170-1715^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

References

Belyakina, T. S., 1968, SvA, 12, 110, 1968SvA....12..110B
Boyarchuk, A. A., Esipov, V. F., Moroz, V. I., 1966, SvA, 10, 331, 1966SvA....10..331B
Boyarchuk, A. A., 1967, SvA, 11, 8, 1967SvA....11....8B
Burbidge, G. R., Burbidge, E. M., 1954, ApJ, 120, 76, 1954ApJ...120...76B
Contini, M., 1997, ApJ, 483, 2, 887, 1997ApJ...483..887C
Eriksson, M., Johansson, S., Wahlgren, G. M., 2006, A&A, 451, 1, 157, 2006A&A...451..157E
Fernie, J. D., 1985, PASP, 97, 653, 1985PASP...97..653F
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2023, MNRAS, 526, 1, 918, 2023MNRAS.526..918G
Kenyon, S. J., Mikołajewska, J., Mikołajewski, M. et al., 1993, AJ, 106, 1573, 1993AJ....106.1573K
Kenyon, S. J., Proga, D., Keyes, C. D., 2001, AJ, 122, 1, 349, 2001AJ....122..349K
Lundmark, K., 1921, AN, 213, 6, 93, 1921AN....213...93L
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Merrill, P. W., Burwell, C. G., 1933, ApJ, 78, 87, 1933ApJ....78...87M
Merrill, P. W., 1916, POMic, 2, 71, 1916POMic...2...71M
Merrill, P. W., 1929, ApJ, 69, 330, 1929ApJ....69..330M
Merrill, P. W., 1951, ApJ, 113, 605, 1951ApJ...113..605M
Merrill, P. W., 1959, ApJ, 129, 44, 1959ApJ...129...44M
Mürset, U., Jordan, S., Walder, R., 1995, A&A, 297, L87, 1995A&A...297L..87M
Ramsay, G., Sokoloski, J. L., Luna, G. J. M. et al., 2016, MNRAS, 461, 4, 3599, 2016MNRAS.461.3599R
Sion, E. M., Godon, P., Mikołajewska, J. et al., 2019, ApJ, 874, 2, 178, 2019ApJ...874..178S
Swings, P., Struve, O., 1942, ApJ, 95, 152, 1942ApJ....95..152S
Swings, P., Struve, O., 1943, ApJ, 97, 194, 1943ApJ....97..194S
Tcheng, M.-L., 1950, AnAp, 13, 51, 1950AnAp...13...51T
Tomov, T., Stoyanov, K. A., Zamanov, R. K., 2016, MNRAS, 462, 4, 4435, 2016MNRAS.462.4435T
Vogel, M., Nussbaumer, H., 1994, A&A, 284, 145, 1994A&A...284..145V
Zhekov, S. A., Tomov, T., 2018, MNRAS, 481, 4, 5156, 2018MNRAS.481.5156Z

AG Peg

Identifiers

Symbiotic Catalogs

Position

Observations

Orbit

Cool component

Hot component

Links

Notes

References

Last updated: January 13, 2024