Tau Persei

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τ Persei
Location of τ Persei (circled)
Observation data
J2000
Constellation Perseus
Right ascension 02h 45m 15.46108s[1]
Declination +52° 45′ 44.9240″[1]
Apparent magnitude (V) 3.94 - 4.07[2]
Characteristics
U−B color index +0.46[3]
B−V color index +0.74[3]
Variable type Algol[2]
τ Per A
Spectral type G8 IIIa[3]
U−B color index +0.68[3]
B−V color index +0.91[3]
τ Per B
Spectral type A3-4 V[3]
U−B color index +0.07[3]
B−V color index +0.15[3]
Distance
254 ± 7 ly
(78 ± 2 pc)
Absolute magnitude (MV)−0.65[3]
−0.45 / 1.26[3]
Argument of periastron
(ω)
(secondary)		54.1°
Details
τ Per A
Gyr
τ Per B
Mass1.8[3] M☉
Radius2.2[3] R☉
Temperature8970 ± 150[3] K
HR 854, SAO
 23685
Database references
SIMBADdata

Tau Persei (τ Per), also known as 18 Persei, is a binary star in the constellation of Perseus. The system is fairly close, and is located about 254 light-years (78 parsecs) away, based on its parallax.[1]

Light curves for the 1989 eclipse of Tau Persei, plotted from data published by Schmidtke and Hopkins (1990)[7]

Tau Persei is an

eclipsing binary, which means the two stellar components orbit each other in such an orientation that they periodically eclipse each other, while blocking the other's light. Unlike many eclipsing binaries that have short orbital periods, Tau Persei has an orbital period of 4.15 years. With a semi-major axis of 0.055 arcseconds,[5] this is one of the few eclipsing binaries whose components can be resolved with interferometry.[8]

The primary component of Tau Persei is a

spectral type of G8III. It has a radius 16 times that of the Sun, and is about 390 million years old.[6] Its companion is an A-type main-sequence star. In 1989, the primary star eclipsed the secondary, allowing for the stellar parameters to be derived via its light curve.[3]

Naming

In

Chinese name for τ Persei itself is 大陵二 (Dà Líng èr, English: the Second Star of Mausoleum.).[9]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    Bibcode:2009yCat....102025S
    .
  3. ^
    Bibcode:1992A&A...254..289G
    .
  4. S2CID 119231169
    .
  5. ^ a b "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 4 April 2017.
  6. ^
    S2CID 119289111
    .
  7. S2CID 121586503
    . Retrieved 20 July 2022.
  8. doi:10.1086/113021
    .
  9. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
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