AX Per

Constellation
Perseus

Equatorial coordinates
α = 01 36 22.697
δ = +54 15 02.318

Galactic coordinates
l = 129.5333°
b = -8.0441°

Suspected	1932^Ref
Confirmed	1932^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref - Z And^Ref

Identifiers

AX Per	IRAS 01331+5359	GSC2.4.2 NAJZ000050	AAVSO 000-BBD-098
SIMBAD V* AX Per	Pan-STARRS 173100240943441658	SAO -	VSX 25601
GAIA DR3 409028569033785728	SkyMapper -	WRAY -	GCVS AX Per
2MASS J01362271+5415023	HIP -	Hen -	BD -
WISE J013622.71+541502.5	TYC 3671-247-1	ESO -	HD -

Symbiotic Catalogs

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

Position

Right ascension (°)	24.0946^Ref	Parallax (mas)	0.424±0.030^Ref	Reddening E(B-V) (mag)	0.19±0.01^Ref ^{, Note}
Declination (°)	54.2506^Ref	Distance (kpc)	2.5^Ref, 1.7^Ref 2.11^Ref ^{, Note}, 2.13^Ref ^{, Note}
Galactic longitude (°)	129.5333^Ref	Proper motion in α (mas/yr)	-1.83±0.03^Ref
Galactic latitude (°)	-8.0441^Ref	Proper motion in δ (mas/yr)	-5.86±0.03^Ref

Observations

X-Ray	No^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	6.60^Ref	Flickering	No^Ref, Yes?^Ref
GALEX FUV (mag)	-	H (mag)	5.69^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	-	K (mag)	5.35^Ref	Outburst type	Z And^Ref
IUE	Yes^Ref	WISE W1 (mag)	5.27^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	5.17^Ref	Resolved nebula	No^Ref
U (mag)	-	WISE W3 (mag)	4.96^Ref	IPmax (eV)	99.0^Ref, 109.3^Ref
B (mag)	12.57^Ref	WISE W4 (mag)	4.42^Ref	[O III] lines	Yes^Ref
V (mag)	11.10^Ref	IRAS 12μm (Jy)	0.28^Ref	He II lines	Yes^Ref
R (mag)	11.04^Ref	IRAS 25μm (Jy)	0.25^Ref	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	0.40^Ref	O VI lines	No^Ref
BP (mag)	11.23^Ref	IRAS 100μm (Jy)	2.04^Ref
G (mag)	9.89^Ref	AKARI S09 (Jy)	0.55^Ref
RP (mag)	8.70^Ref	AKARI S18 (Jy)	0.17^Ref

Orbit

Orbital period (days)	681.6^Ref, 680.8±0.2^Ref, 682.1±1.4^Ref	γ velocity (km/h)	-116.5±0.4^Ref, -117.44±0.14^Ref	Size of giant’s orbit (AU)	0.49^Ref
Eccentricity	0±nan^Ref	RV of giant (km/h)	7.5±0.9^Ref, 7.78±0.21^Ref	Separation (AU)	-
Inclination (°)	70±3^Ref, 90±6^Ref	Inferior conj. of giant (JD)	2451134.3	Mass function	0.0333^Ref
Eclipses	Yes^Ref			Mass ratio	2.5^Ref, 2.3^Ref
Orbital ephemeris	Min (pg) = 2436679.4 + 681.6 x E^Ref, Min (V) = 2436667±3 + 680.8±0.2 x E^Ref

Cool component

Spectral type	M5.2 III^Ref, M4.5 III^Ref, M5.5 III^Ref	Mass (M_⊙)	3^Ref, 1^Ref, 0.9±0.2^Ref	Pulsation	-
Eff. temperature (K)	3300^Ref, 3400±150^Ref, 3320^Ref	Radius (R_⊙)	102±3^Ref, 115±2^Ref	Type	-
IR type	S^Ref	Luminosity (L_⊙)	3000^Ref, 1800^Ref, 1200±400^Ref, 1450^Ref	Pulsation period (days)	-
Metallicity [Fe/H]	-0.26±0.1^Ref			Pulsation ephemeris	-

Hot component

Type/Spectral type	-	Mass (M_⊙)	0.6^Ref, 0.4^Ref, 0.37±0.06^Ref	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	0.08^Ref, 0.065^Ref	Accretion disk	-
Eff. temperature (K)	120000^Ref, 105000^Ref, 115000-170000^Ref	Luminosity (L_⊙)	240-310^Ref, 710^Ref, 360^Ref, 380^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

The star was discovered by Merrill & Humason (1932), and they reported an "anomalous combination in a single spectrum of features which ordinarily occur near opposite ends of the sequence of stellar temperatures." The detection of TiO bands and a strong He II line was reported by Merrill & Burwell (1933). For historical light curves, you can refer to, e. g., Skopal et al. (2001) and Mártonfi et al. (2021).

References

Fekel, F. C., Hinkle, K. H., Joyce, R. R. et al., 2000, AJ, 120, 6, 3255, 2000AJ....120.3255F
Gałan, C., Mikołajewska, J., Hinkle, K. H. et al., 2023, MNRAS, 526, 1, 918, 2023MNRAS.526..918G
Kenyon, S. J., Fernandez-Castro, T., 1987, AJ, 93, 938, 1987AJ.....93..938K
Kenyon, S. J., 1982, PASP, 94, 165, 1982PASP...94..165K
Lindsay, E. M., 1932, BHarO, 888, 22, 1932BHarO.888...22L
Luna, G. J. M., Sokoloski, J. L., Mukai, K. et al., 2013, A&A, 559, A6, 2013A&A...559A...6L
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., Humason, M. L., 1932, PASP, 44, 257, 56, 1932PASP...44...56M
Merrill, P. W., 1944, ApJ, 99, 15, 1944ApJ....99...15M
Mikołajewska, J., Kenyon, S. J., 1992, AJ, 103, 579, 1992AJ....103..579M
Mikołajewska, J., Tijima, T., 1987, AcA, 37, 17, 1987AcA....37...17M
Mártonfi, P., Gális, R., Merc, J., 2021, OEJV, 220, 26, 2021OEJV..220...26M
Mürset, U., Nussbaumer, H., Schmid, H. M. et al., 1991, A&A, 248, 458, 1991A&A...248..458M
Mürset, U., Schmid, H. M., 1999, A&AS, 137, 473, 1999A&AS..137..473M
Schild, H., Dumm, T., Mürset, U. et al., 2001, A&A, 366, 972, 2001A&A...366..972S
Skopal, A., Tarasova, T. N., Cariková, Z. et al., 2011, A&A, 536, A27, 2011A&A...536A..27S
Skopal, A., Teodorani, M., Errico, L. et al., 2001, A&A, 367, 199, 2001A&A...367..199S
Skopal, A., 1994, A&A, 286, 453, 1994A&A...286..453S
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
Swings, P., Struve, O., 1942, ApJ, 95, 152, 1942ApJ....95..152S
Swings, P., Struve, O., 1943, ApJ, 97, 194, 1943ApJ....97..194S