X Per
HIP 18350
DoubleStar
Per
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
6.10
Variable Type
Gamma Cassiopeiae (Eruptive Be Star)
Spectral Type
O9.5ep
Star Color
Yellow-white
(B-V 0.29)
Position & Identifiers
RA
03h 55m 23.0s
Dec
+31° 02' 45.0"
Constellation
Per
HR
1209
HIP
18350
Variable ID
X Per
Double Cat
2859
Querying VizieR catalog...
Visibility
Set a location in User Settings to see visibility data.
Multiple Star System
Separation
23.4″
Companion Mag
12.3
Position Angle
13°
Star Colors
A: Yellow-white
Discoverer
HO 325
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 23.4″ · PA: 13° · N up, E left
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
Size Comparison
Querying VizieR for stellar data…
Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
Loading HR diagram…
Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Notes
ADS 2859A, Gamma Cas 6.07 - 7.0V, 580.7?d. Amp. about 0.02U. X-ray period 22.4 hrs. Spectrum variable. Sudden | decrease in H alpha emission followed by 450 sec. flare in continuum. Possible neutron star companion pulsating in | 13.924 min. Simultaneous X-ray and optical obs. 21 Jan. 1975 showed X-ray var. by factor 2 but no corresponding optical | 100 sec. quasi periodic photometric var. may indicate binary with compact companion undergoing mass accretion.
CPM? Component A possibly optical counterpart or companion of X-ray source 4U0352+30. Possibly a triple system with a | neutron star moving around the optical primary in 22.4 hrs., and either apsidal period 581d or close double moving | around a distant component in 581d. Rotational velocity of primary, vsini 306k/s. Component ADS 2859B is normal M1III, | not T Tau type as once assumed.
580.7d, K 59k/s, V0 -50k/s, asini 471. Emission lines var. in RV, 22.4 hrs. and 581d.
Heavily reddened.
May not be member of Per OB2; Zeta Per group.
Sp. data suggest occasional interruption of almost steady infall of material through rotating emission region by | outbursts of material from the star.
Survey Image
Loading survey image…