B Persei

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b Persei
Perseus constellation map.svg
Red circle.svg
Location of b Persei (circled)
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Perseus
Right ascension 04h 18m 14.61690s [1]
Declination +50° 17 43.8058 [1]
Apparent magnitude  (V)4.52 - 4.68 [2]
Characteristics
Spectral type A1III [3]
B−V color index +0.04 [4]
Variable type Ellipsoidal [2]
Astrometry
Radial velocity (Rv)19.8±0.9 [5]  km/s
Proper motion (μ)RA: 45.42±0.40 [1]   mas/yr
Dec.: −56.72±0.32 [1]   mas/yr
Parallax (π)10.40 ± 0.35  mas [1]
Distance 310 ± 10  ly
(96 ± 3  pc)
Absolute magnitude  (MV)0.3 [6]
Orbit [7]
PrimaryA or Aa
CompanionC or Ac
Period (P)701.76 days
Semi-major axis (a)5.09 mas
Eccentricity (e)0.235
Inclination (i)83.46°
Longitude of the node (Ω)115.29°
Periastron epoch (T)2440143.3984
Argument of periastron (ω)
(secondary)
263°
Details
A or Aa
Mass 2.25 [6]   M
Radius 3.2 [8]   R
Luminosity 10 [9]   L
Temperature 9000 [6]   K
Rotational velocity (v sin i)81 [10]  km/s
B or Ab
Mass 0.56 [11]   M
Radius 0.25 [8]   R
C or Ac
Mass 1.24 [11]   M
Luminosity2 [9]   L
Other designations
BD+49°1150, GC  5174, HD 26961, HR 1324, HIP 20070, SAO  24531
Database references
SIMBAD data
Light curves for b Persei. The top panel, plotted from TESS data, shows the variability of the inner binary pair. The lower panels, plotted from AAVSO data, show two eclipses. BPerLightCurve.png
Light curves for b Persei. The top panel, plotted from TESS data, shows the variability of the inner binary pair. The lower panels, plotted from AAVSO data, show two eclipses.

b Persei (also known as HD 26961) is a spectroscopic triple star in the constellation Perseus. Its apparent magnitude is 4.60, making it visible to the naked eye. [6] It is about 320 light years away. [1]

In addition to the primary, an A-type giant, there is a smaller and cooler companion in a 1.53 day orbit, probably an F-class star around absolute magnitude 3.0, and a more distant companion (star C or Ac) in an orbit calculated to be 702 days long. [6] The close binary pair forms a rotating ellipsoidal variable with a 1.53 day period. Star C forms an Algol-type variable system with the close binary, showing both primary eclipses (when star C passes in front of the inner pair) and secondary eclipses (when the inner pair passes in front of star C). [14] Timings of the eclipses show a 705.4-day period. [9]

Related Research Articles

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<span class="mw-page-title-main">42 Persei</span> Binary star system in the constellation Perseus

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<span class="mw-page-title-main">21 Persei</span> Star in the constellation Perseus

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<span class="mw-page-title-main">25 Serpentis</span> Star in the constellation Serpens

25 Serpentis is a star system in the constellation of Serpens Caput. With an apparent magnitude of 5.37, it is just barely visible to the naked eye. The system is estimated to be some 450 light-years based on its parallax.

<span class="mw-page-title-main">AC Herculis</span> Spectroscopic binary star in the constellation Hercules

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<span class="mw-page-title-main">HR 7484</span> Star in the constellation Cygnus

HR 7484 is a binary star system in the northern constellation of Cygnus. It is dimly visible to the naked eye under good viewing conditions, having an apparent visual magnitude of 5.89. Based upon an annual parallax shift of 24.71, it is located 132 light years away. The system is moving closer with a heliocentric radial velocity of −14 km/s.

References

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