X Persei

X Persei
Observation data Epoch J2000.0 Equinox J2000.0
Location of X Per (circled)
Constellation	Perseus
Right ascension	03^h 55^m 23.07715^s^[1]
Declination	+31° 02′ 450062″^[1]
Apparent magnitude (V)	6.778^[2] (6.03 - 7.00^[3])
Characteristics
Spectral type	O9.5IIIe-B0Ve^[4]
U−B color index	−0.790^[2]
B−V color index	+0.137^[2]
Variable type	γ Cas + X-ray pulsar^[3]
Astrometry

Radial velocity (R_v)	−50.00^[5] km/s
Proper motion (μ)	RA: −2.28^[1] mas/yr Dec.: −5.42^[1] mas/yr
Parallax (π)	2.34 ± 0.70^[1] mas
Distance	950^[6] pc
Absolute magnitude (M_V)	−3.47^[2]

Orbit^[7]
Primary	X Per
Companion	4U 0352+309
Period (P)	250.3 days
Semi-major axis (a)	2.2 AU
Eccentricity (e)	0.111
Inclination (i)	23 - 30°
Details

Mass	15.5^[8] M_☉
Radius	6.5^[8] R_☉
Luminosity	29,000^[2] L_☉
Surface gravity (log g)	4.0^[2] cgs
Temperature	29,500^[8] K
Rotational velocity (v sin i)	215^[2] km/s
Age	5^[2] Myr

Other designations
X Persei, HR 1209, HIP 18350, HD 24534, BD+30°591, WDS J03554+3103, AAVSO 0349+30
A: X Per
B: 4U 0352+309
Database references
SIMBAD	data

X Persei is a binary star system located in the constellation Perseus, approximately 950 parsecs away.

The optical star X Persei has been classified either as an O-type giant or a B-type main sequence star. It is a Be star, rotating rapidly, and at times surrounded by a disk of expelled material. This qualifies it as a Gamma Cassiopeia variable, and the visual range is magnitude 6 - 7. There is a faint optical companion separated by 22.5" which the Catalog of Components of Double and Multiple Stars refers to as X Persei B.^[9]

X Persei A is in orbit with a neutron star, which is catalogued as 4U 0352+309 in the final Uhuru catalog of x-ray objects. It is a pulsar with an unusually long period of 837 seconds.^[7]

References

1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
1 2 3 4 5 6 7 8 Lyubimkov, L. S.; Rostopchin, S. I.; Roche, P.; Tarasov, A. E. (1997). "Fundamental parameters, helium abundance and distance of X Persei". Monthly Notices of the Royal Astronomical Society. 286 (3): 549. Bibcode:1997MNRAS.286..549L. doi:10.1093/mnras/286.3.549.
1 2 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
↑ Valencic, Lynne A.; Smith, Randall K. (2013). "Interstellar Abundances toward X Per, Revisited". The Astrophysical Journal. 770: 22. Bibcode:2013ApJ...770...22V. doi:10.1088/0004-637X/770/1/22.
↑ Kharchenko, N. V.; Scholz, R.-D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776.
↑ Walter, Roland; Lutovinov, Alexander A.; Bozzo, Enrico; Tsygankov, Sergey S. (2015). "High-mass X-ray binaries in the Milky Way. A closer look with INTEGRAL". The Astronomy and Astrophysics Review. 23: 2. arXiv:1505.03651. Bibcode:2015A&ARv..23....2W. doi:10.1007/s00159-015-0082-6.
1 2 Delgado‐Marti, H.; Levine, A. M.; Pfahl, E.; Rappaport, S. A. (2001). "The Orbit of X Persei and Its Neutron Star Companion". The Astrophysical Journal. 546: 455. arXiv:astro-ph/0004258. Bibcode:2001ApJ...546..455D. doi:10.1086/318236.
1 2 3 Grundstrom, E. D.; Boyajian, T. S.; Finch, C.; Gies, D. R.; Huang, W.; McSwain, M. V.; O'Brien, D. P.; Riddle, R. L.; Trippe, M. L.; Williams, S. J.; Wingert, D. W.; Zaballa, R. A. (2007). "Joint Hα and X-Ray Observations of Massive X-Ray Binaries. III. The Be X-Ray Binaries HDE 245770 = A0535+26 and X Persei". The Astrophysical Journal. 660 (2): 1398. arXiv:astro-ph/0702283. Bibcode:2007ApJ...660.1398G. doi:10.1086/514325.
↑ Dommanget, J.; Nys, O. (1994). "Catalogue des composantes d'etoiles doubles et multiples (CCDM) premiere edition - Catalogue of the components of double and multiple stars (CCDM) first edition". Com. de l'Observ. Royal de Belgique. 115: 1. Bibcode:1994CoORB.115....1D.

Stars of Perseus

Bayer	α (Mirfak) β (Algol) γ δ ε ζ η (Miram) θ ι κ (Misam) λ μ ν ξ (Menkib) ο (Atik) π (Gorgonea Secunda) ρ (Gorgonea Tertia) σ τ φ ψ ω (Gorgonea Quarta) b

Flamsteed	1 2 3 4 5 7 (χ) 8 9 10 11 12 14 16 17 20 21 24 29 30 31 32 34 36 40 42 43 48 49 50 52 53 54 55 56 57 58 59 1 Aur

Variable	S T U V X Z RS RT RV RW RY ST SU SV TZ UV UX UY VX XX XY XZ YZ AB AG AR AS AW AX BM DM DY FO GK IK IP IQ IU IW IX IZ KP KS KT KW LX V351 V356 V357 V361 V376 V380 V386 V396 V400 V423 V432 V440 V459 V461 V471 V472 V473 V480 V490 V492 V493 V505 V509 V520 (61 And) V521 V545 V551 V572 V573 V575 V576 V621 V718

HR	470 526 529 538 540 621 641 787 792 810 820 831 842 846 849 864 865 876 885 886 890 894 918 920 923 930 949 950 956 964 966 969 973 975 979 986 991 1001 1019 1034 1037 1041 1047 1051 1056 1059 1074 1097 1113 1127 1130 1133 1141 1160 1164 1176 1191 1197 1198 1207 1215 1226 1234 1286 1301 1330 1333 1337 1344 1371 1390 1419 1424 1482 1489 1493 1500 1514

HD	13519 14433 14434 16691 16760 17092 17245 17605 21684 22781 23301 23596 25329 26702 29587

Gliese	GJ 1068

Other	BD+31 643 BD+48 740 G 38-29 G 95-57 GD 61 GRO J0422+32 HAT-P-15 HAT-P-29 IRAS 04296+3429 L1448-IRS2E LkHα 101 LRLL 54361 NGC 1333 13 NGC 1333 IRAS 2A NGC 1333 IRAS 4A NGC 1333 IRAS 4B NSV 1436 PSR B0355+54 PSR J0357+3205

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