34 Persei
Binary star system in the constellation Perseus
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34 Persei is a binary star[3] system in the northern constellation of Perseus. It is visible to the naked eye as a faint, blue-white hued point of light with a combined apparent visual magnitude of 4.67.[2] The system is located approximately 540 light years away from the Sun based on parallax,[1] but it is drifting closer with a radial velocity of −3.5 km/s.[6] It is a likely member of the Alpha Persei Cluster.[11]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 29m 22.05019s[1] |
| Declination | +49° 30′ 32.2114″[1] |
| Apparent magnitude (V) | 4.67[2] (4.76 + 7.18)[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | B3V[4] |
| U−B color index | −0.57[5] |
| B−V color index | −0.09[5] |
| Astrometry | |
| Radial velocity (Rv) | −3.50[6] km/s |
| Proper motion (μ) | RA: +22.20[1] mas/yr Dec.: −29.49[1] mas/yr |
| Parallax (π) | 6.05±0.36 mas[1] |
| Distance | 540 ± 30 ly (165 ± 10 pc) |
| Absolute magnitude (MV) | −1.62[2] |
| Details | |
| 32 Per A | |
| Mass | 6.9±0.1[7] M☉ |
| Radius | 3.1[8] R☉ |
| Luminosity | 671[2] L☉ |
| Surface gravity (log g) | 4.076[9] cgs |
| Temperature | 16,421[9] K |
| Rotational velocity (v sin i) | 200[9] km/s |
| Age | 29.3±3.4[7] Myr |
| Other designations | |
| 34 Per, BD+49°945, FK5 1549, GC 4133, HD 21428, HIP 16244, HR 1044, SAO 38872, CCDM J03294+4931AB, WDS J03294+4931AB[10] | |
| Database references | |
| SIMBAD | data |
The primary member, designated component A, is a B-type main-sequence star with a stellar classification of B3V[4] and visual magnitude 4.76.[3] It is an estimated 29[7] million years old with a high rate of spin, showing a projected rotational velocity of 200 km/s.[9] The star has 6.9[7] times the mass of the Sun and about 3.1[8] times the Sun's radius. It is radiating 671[2] times the Sun's luminosity from its photosphere at an effective temperature of 16,421 K.[9]
The secondary companion, component B, has an angular separation of 0.6″ from the primary and visual magnitude of 7.34.[12]