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42 Persei

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42 Persei
Location of 42 Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 49m 32.68952s[1]
Declination 33° 05′ 28.9603″[1]
Apparent magnitude (V) 5.11[2]
Characteristics
Spectral type A3V[3] + MV[4]
U−B color index +0.11[2]
B−V color index +0.07[2]
Variable type Ellipsoidal[4]
Astrometry
Radial velocity (Rv)-12.40[5] km/s
Proper motion (μ) RA: -18.63[1] mas/yr
Dec.: -1.47[1] mas/yr
Parallax (π)12.15 ± 0.70 mas[1]
Distance270 ± 20 ly
(82 ± 5 pc)
Absolute magnitude (MV)0.57[6]
Orbit[4]
Period (P)1.7653511 ± 0.000002 d
Semi-major axis (a)8.207 M☉
(0.0382 AU)
Eccentricity (e)0.056
Inclination (i)65.3°
Argument of periastron (ω)
(secondary)		257°
Semi-amplitude (K1)
(primary)		34.34 km/s
Details
42 Per A
Mass2.0[4] M☉
Radius3.48[4] R☉
Luminosity59[7] L☉
Surface gravity (log g)3.78[8] cgs
Temperature8892[7] K
Metallicity [Fe/H]0.00[9] dex
Rotational velocity (v sin i)91[7] km/s
42 Per B
Mass0.38[4] M☉
Temperature3500[4] K
Other designations
n Persei, V467 Per, BD+32°667, GC 4592, HIP 17886, HR 1177, HD 23848, SAO 56727
Database references
SIMBADdata

42 Persei is a star in the constellation Perseus. Its apparent magnitude is 5.11.[2] Located around 82.30 parsecs (268.4 ly) distant,[1] it is a blue-white main-sequence star of spectral type A3V,[3] a star that is fusing its core hydrogen.

It is an rotating ellipsoidal variable, ranging from magnitude 5.18 to 5.05.[10] It is a spectroscopic binary with a period of 1.76535 days and an eccentricity of 0.056, implying a round orbit. The companion star is likely to be a dim red dwarf.[4]

In Chinese astronomy, 42 Persei is called 天讒, Pinyin: Tiānchán, meaning Celestial Slander, because this star is marking itself and stand alone in Celestial Slander asterism, Hairy Head mansion (see : Chinese constellation).[11]

References

  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. ^ a b c d e f g h Martin, Brian E. (1990). "The ellipsoidal variable 42 Persei - Observations and model". Astronomical Society of the Pacific. 102: 1153–1160. Bibcode:1990PASP..102.1153M. doi:10.1086/132746.
  5. ^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213.
  6. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. Vizier catalog entry
  7. ^ a b c Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
  8. ^ David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. Vizier catalog entry
  9. ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031.
  10. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....1.2025S.
  11. ^ Ian Ridpath's Startales - Perseus


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