X Persei

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X Persei
Perseus constellation map.svg
Red circle.svg

Location of X Per (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 03h 55m 23.07715s[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 (Rv) −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 (MV) −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

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